Accenture Full Stack Developer Interview Questions and Selection Process

Accenture Full Stack Developer Interviews Evaluate A Candidate’s Knowledge Across Frontend Development, Backend Programming, Databases, APIs, Testing, Version Control, Cloud, Security, And Software Design. The Interview May Also Focus On Real-World Project Experience, Problem-Solving Ability, Communication Skills, And The Ability To Explain Technical Decisions Clearly. Accenture States That Its Hiring Process Can Include Application Review, Interviews, And, For Some Roles, Online Skills Assessments; The Number And Format Of Interviews Depend On The Specific Role.For Full Stack Developer Roles, Preparation Should Cover Technologies Such As JavaScript, TypeScript, React Or Angular, Java Or Node.js, REST APIs, SQL, NoSQL, Git, Testing, And Cloud Concepts. Candidates Should Also Be Prepared To Explain Project Architecture, Frontend-Backend Communication, Database Design, Authentication, Error Handling, Performance Optimization, And Deployment

1. What Is Full Stack Development?

Ans:

Full Stack Development Involves Building Both The Frontend And Backend Parts Of A Web Application, Allowing A Developer To Work Across Multiple Layers Of The Application. The Frontend Handles The User Interface And User Interactions, While The Backend Manages Business Logic, Authentication, APIs, And Server-Side Processing. Databases Are Used To Store And Retrieve Application Data Required By Different Features. Full Stack Developers Commonly Work With Technologies Such As HTML, CSS, JavaScript, Java, Node.js, And SQL. They Also Need Knowledge Of APIs, Version Control, Testing, And Deployment To Build And Maintain Complete Applications..

2. What Is The Difference Between Frontend And Backend Development?

Ans:

Frontend Development Focuses On The Visible Part Of A Web Application That Users Interact With Directly, While Backend Development Focuses On Server-Side Logic And Application Processing. HTML, CSS, JavaScript, React, Angular, And Vue Are Commonly Used For Frontend Development. Backend Development Handles Business Logic, Data Processing, Application Services, And Communication With Databases. Technologies Such As Java, Spring Boot, Node.js, Python, And .NET Are Commonly Used For Backend Development. The Frontend Usually Communicates With The Backend Through APIs To Request Or Submit Data. The Backend Communicates With Databases And External Services To Process Those Requests.

3. What Are The Main Technologies Used In Full Stack Development?

Ans:

Full Stack Development Uses Different Technologies For Building The User Interface, Application Logic, Data Layer, And Deployment Environment. HTML Is Used To Structure Web Pages, While CSS Is Used To Design And Style User Interfaces. JavaScript Provides Dynamic Behavior And Client-Side Functionality For Web Applications. Backend Technologies Such As Java, Spring Boot, Node.js, And .NET Handle Server-Side Processing And Business Logic. SQL And NoSQL Databases Are Used To Store And Retrieve Application Data. Git, Docker, Jenkins, And Cloud Platforms Can Support Version Control, Containerization, Automation, And Deployment. The Exact Technology Stack Depends On Project Requirements And Organizational Standards.

4. What Is HTML?

Ans:

• HTML Stands For HyperText Markup Language And Is Used To Structure The Content Of Web Pages And Applications. It Provides Elements For Creating Headings, Paragraphs, Forms, Tables, Images, Links, And Other Web Content. 
• Semantic HTML Elements Help Improve Accessibility And Make The Structure Of A Web Page Easier For Search Engines And Assistive Technologies To Understand. Forms Are Commonly Used To Collect Information From Users And Submit It To The Application. 
• HTML Works Together With CSS For Presentation And JavaScript For Dynamic Behavior. Modern Web Applications Commonly Use HTML5 Features To Build Structured And Interactive Interfaces. A Strong Understanding Of HTML Is Essential For Frontend Development.

5. What Is CSS?

Ans:

CSS Stands For Cascading Style Sheets And Is Used To Control The Presentation And Visual Appearance Of Web Pages. It Can Define Properties Such As Colors, Fonts, Spacing, Borders, Layouts, Dimensions, And Responsive Designs. CSS Provides Layout Techniques Such As Flexbox And Grid For Creating Flexible And Structured Interfaces. Media Queries Allow Developers To Apply Different Styles Based On Screen Size And Device Characteristics. Reusable CSS Classes Help Maintain Consistency Across Different Pages And Components Of An Application. Modern Frontend Frameworks Can Also Provide Component-Based Styling Approaches For Better Organization. Good CSS Knowledge Helps Developers Build Responsive, Attractive, And User-Friendly Interfaces.

6. What Is JavaScript?

Ans:

JavaScript Is A Programming Language Commonly Used To Add Dynamic Behavior And Interactivity To Web Applications. It Can Handle User Events, Manipulate The DOM, Validate Forms, And Communicate With Backend APIs. Modern JavaScript Provides Features Such As Promises, Modules, Classes, And Async/Await For Building Structured Applications. JavaScript Can Run Inside Web Browsers And Also On Servers Through Platforms Such As Node.js. It Is Widely Used With Frontend Frameworks And Libraries Such As React, Angular, And Vue. JavaScript Supports Both Object-Oriented And Functional Programming Approaches. Strong JavaScript Knowledge Is Important For Modern Full Stack Development Because It Can Be Used Across Multiple Application Layers.

7. What Is DOM?

Ans:

DOM Stands For Document Object Model And Represents An HTML Document As A Tree-Like Structure. Each HTML Element In A Web Page Is Represented As A Node Within The DOM Structure. JavaScript Can Access, Modify, Add, Or Remove These Nodes Dynamically During Application Execution. DOM Manipulation Can Be Used To Change Text, Attributes, Styles, And Other Elements On A Web Page. Browser Events Such As Click, Submit, Change, And Mouse Events Can Also Be Handled Through The DOM. The DOM Allows Web Applications To Respond Dynamically To User Interactions And Update Content Without Reloading The Entire Page.

8. What Is Responsive Web Design?

Ans:

Responsive Web Design Is An Approach That Allows A Website Or Web Application To Adapt To Different Screen Sizes And Devices. It Ensures That Applications Work Properly On Mobile Phones, Tablets, Laptops, And Desktop Computers. CSS Media Queries Are Commonly Used To Apply Different Styles Based On Screen Size And Device Characteristics. Flexible Grids, Responsive Images, Flexbox, And CSS Grid Can Also Be Used To Create Adaptive Layouts. Responsive Design Improves User Experience By Making Content Easy To Read And Navigate Across Different Devices.

9. What Is React?

Ans:

React Is A JavaScript Library Used For Building User Interfaces And Interactive Web Applications. It Uses Components To Divide The User Interface Into Smaller, Reusable Pieces That Can Be Developed And Maintained Independently. React Applications Commonly Use JSX To Describe UI Elements In A Syntax That Combines JavaScript With Markup-Like Structures. State And Props Help Components Manage Their Own Data And Receive Information From Other Components. React Uses Efficient Rendering Techniques To Update The User Interface When Application Data Changes.

10. What Is Angular?

Ans:

• Angular Is A TypeScript-Based Framework Used For Building Structured And Scalable Web Applications. It Provides Features Such As Components, Services, Routing, Forms, And Dependency Injection To Support Application Development. 
• Angular Applications Are Usually Organized Into Reusable Components That Represent Different Parts Of The User Interface. TypeScript Provides Strong Typing And Modern Programming Features That Help Developers Maintain Large Codebases.
•  RxJS Is Used For Reactive Programming And Handling Asynchronous Data Streams Within Angular Applications. Angular CLI Helps Developers Create, Build, Test, And Maintain Applications Efficiently.

11. What Is Component-Based Architecture?

Ans:

Component-Based Architecture Divides An Application Interface Into Independent And Reusable Components That Perform Specific UI Responsibilities. Each Component Usually Contains Its Own Structure, Behavior, And Styling, Making The Application Easier To Organize. Components Can Receive Data From Other Components And Communicate Through Defined Interfaces Or Mechanisms. This Approach Improves Code Reusability And Maintainability By Preventing Large Interfaces From Becoming One Monolithic Block

12. What Is State Management?

Ans:

State Management Refers To The Process Of Managing Data That Changes During The Execution Of An Application. Examples Of Application State Include Login Information, Shopping Cart Data, Form Values, User Preferences, And UI Status. Local Component State Can Manage Data That Is Required Only By A Specific Component Or Small Section Of An Application. Shared State May Need Centralized Management When Multiple Components Depend On The Same Information.

13. What Is Node.js?

Ans:

Node.js Is A JavaScript Runtime Environment Built On The V8 JavaScript Engine And Allows JavaScript Code To Execute Outside A Web Browser. It Uses An Event-Driven And Non-Blocking I/O Model That Makes It Suitable For Handling Many I/O Operations Efficiently. Node.js Is Commonly Used For Building REST APIs, Real-Time Applications, Backend Services, And Network-Based Applications. The npm Ecosystem Provides Thousands Of Reusable Packages That Can Be Integrated Into Node.js Projects.

14. What Is Express.js?

Ans:

Express.js Is A Lightweight Web Framework Built On Top Of Node.js And Is Commonly Used For Developing Web Servers And REST APIs. It Simplifies Backend Development By Providing Features For Routing, Middleware, Request Handling, And Response Management. Middleware Can Be Used For Tasks Such As Authentication, Logging, Input Validation, And Error Handling. Routes Can Be Organized According To Different Application Features To Keep Backend Code Structured.

15. What Is Java?

Ans:

Java Is A General-Purpose, Object-Oriented Programming Language Widely Used For Building Enterprise And Backend Applications. It Provides Platform Independence Through The Java Virtual Machine, Allowing Compiled Java Programs To Run On Different Operating Systems. Java Supports Important Object-Oriented Concepts Such As Encapsulation, Inheritance, Polymorphism, And Abstraction. It Is Commonly Used With Frameworks Such As Spring And Spring Boot To Build Scalable Backend Systems And REST APIs. Java Provides Strong Type Checking, Extensive Libraries, And A Mature Development Ecosystem.

16. What Is Spring Boot?

Ans:

Spring Boot Is A Java Framework Designed To Simplify The Development Of Production-Ready Applications And Backend Services. It Reduces Configuration Requirements Through Features Such As Auto-Configuration And Starter Dependencies. Spring Boot Commonly Provides Embedded Servers, Allowing Web Applications To Run Without Requiring A Separate Application Server Installation. It Is Widely Used To Build REST APIs, Microservices, And Enterprise Backend Applications

17. What Is Dependency Injection?

Ans:

Dependency Injection Is A Design Technique In Which Required Dependencies Or Objects Are Provided To A Class Instead Of The Class Creating Them Directly. This Approach Reduces Tight Coupling Between Application Components And Makes The Overall Architecture More Flexible. The Spring Framework Uses Dependency Injection Extensively To Manage Application Components And Their Dependencies. Dependencies Can Be Injected Through Constructors, Setters, Or Fields, Depending On The Design And Framework Configuration.

18. What Is REST API?

Ans:

• REST Stands For Representational State Transfer And Describes A Set Of Principles Commonly Used For Designing Web Services. 
• REST APIs Commonly Use HTTP Methods Such As GET, POST, PUT, PATCH, And DELETE To Perform Operations On Resources. 
• Resources Are Usually Identified Through URLs, Making API Endpoints Easy To Understand And Organize.

19. What Is The Difference Between GET And POST?

Ans:

Aspect	GET	POST
Purpose	Used To Retrieve Data From A Server.	Used To Send Or Submit Data To A Server.
Data Location	Data Is Commonly Sent Through The URL Query Parameters.	Data Is Commonly Sent Inside The Request Body
Caching	GET Requests Can Generally Be Cached By Browsers And Intermediaries.	POST Requests Are Generally Not Cached By Default.
Typical Use	Commonly Used For Searching, Reading, Or Fetching Resources.	Commonly Used For Creating Resources Or Submitting Form Data.

20. What Is The Difference Between PUT And PATCH?

Ans:

PUT Is Commonly Used To Replace An Existing Resource With A New Representation, While PATCH Is Used To Apply Partial Changes To An Existing Resource. A PUT Request May Contain The Complete Representation Of The Resource That Needs To Be Updated. A PATCH Request Can Contain Only The Fields That Need Modification, Making It Useful For Partial Updates. PUT Is Generally Considered Idempotent When It Is Properly Implemented, Meaning Repeating The Same Request Produces The Same Intended Result.

21. What Is JSON?

Ans:

JSON Stands For JavaScript Object Notation And Is A Lightweight Data Interchange Format Commonly Used For Exchanging Data Between Different Systems. It Represents Data Using Objects, Arrays, Strings, Numbers, Boolean Values, And Null Values In A Simple And Readable Structure. JSON Is Easy For Humans To Read And Easy For Programming Languages To Process. REST APIs Commonly Use JSON To Send Request Data From Clients And Return Response Data From Servers.

22. What Is HTTP?

Ans:

• HTTP Stands For HyperText Transfer Protocol And Is A Communication Protocol Used To Exchange Information Between Clients And Servers Over A Network. 
• In A Web Application, The Client Sends An HTTP Request To A Server Containing Information About The Required Operation. 
• The Server Processes The Request And Returns An HTTP Response Containing Data Or An Appropriate Status. HTTP Supports Methods Such As GET, POST, PUT, PATCH, And DELETE For Different Operations.

23. What Are HTTP Status Codes?

Ans:

HTTP Status Codes Are Numeric Codes Returned By A Server To Indicate The Result Of A Client Request. Status Codes In The 2xx Range Generally Represent Successful Operations, Such As 200 For A Successful Request. Codes In The 3xx Range Are Generally Related To Redirection And Indicate That Additional Action May Be Required. Codes In The 4xx Range Usually Indicate Client-Side Problems, Such As Invalid Requests Or Missing Resources. Codes In The 5xx Range Usually Indicate Server-Side Problems.

24. What Is Authentication?

Ans:

• Authentication Is The Process Of Verifying The Identity Of A User, Application, Or System Before Providing Access To Protected Resources. 
• Users Can Be Authenticated Through Passwords, Tokens, Certificates, Or External Identity Providers. Modern Web Applications Frequently Use Token-Based Authentication For API Communication And User Sessions. 
• Passwords Should Never Be Stored As Plain Text And Should Instead Be Protected Using Appropriate Secure Hashing Techniques.

25. What Is Authorization?

Ans:

Authorization Is The Process Of Determining Whether An Authenticated User Has Permission To Perform A Particular Operation Or Access A Specific Resource. For Example, An Administrator May Be Allowed To Manage Users While A Normal User May Only Be Allowed To View Or Update Personal Information. Role-Based Access Control Is Commonly Used To Assign Permissions According To User Roles. Although Frontend Applications Can Hide Features Based On Permissions, Authorization Must Always Be Enforced On The Backend. Frontend Controls Alone Cannot Provide Security Because Requests Can Be Modified Or Sent Directly To The Backend.

26. What Is JWT?

Ans:

JWT Stands For JSON Web Token And Is A Token Format Commonly Used For Authentication And Secure Information Exchange Between Clients And Servers. A JWT Usually Contains Three Main Parts Called The Header, Payload, And Signature. The Header Contains Information About The Token Type And Signing Algorithm, While The Payload Contains Claims Such As User Identity Or Roles. The Signature Allows The Server To Verify That The Token Has Not Been Modified. JWT Payload Data Is Encoded Rather Than Encrypted, So Sensitive Information Should Not Be Stored In It.

27. What Is CORS?

Ans:

CORS Stands For Cross-Origin Resource Sharing And Is A Browser Security Mechanism That Controls Requests Made Between Different Origins. Browsers Apply Same-Origin Security Rules To Prevent Web Applications From Accessing Resources From Other Origins Without Permission. A Backend Server Can Configure CORS To Allow Requests From Specific Trusted Origins. HTTP Headers Such As Access-Control-Allow-Origin Help Define Which Origins Are Permitted To Access The API.

28. What Is Middleware?

Ans:

Middleware Is Software That Executes During The Processing Of An Incoming Request Before The Final Response Is Returned To The Client. Middleware Can Perform Common Tasks Such As Logging, Authentication, Input Validation, Error Handling, Request Transformation, And Authorization. Express.js Uses Middleware Extensively To Process HTTP Requests In Node.js Applications. Middleware Functions Can Read Or Modify Request And Response Objects Before Passing Control To The Next Processing Function. A Middleware Function Can Also End The Request-Response Cycle When A Condition Requires Immediate Response.

29. What Is MVC Architecture?

Ans:

MVC Stands For Model, View, And Controller And Is A Software Architectural Pattern Used To Separate Different Responsibilities Within An Application. The Model Represents Application Data And Often Contains Logic Related To Data Management And Business Operations. The View Represents The User Interface And Displays Information To The User. The Controller Handles Incoming Requests And Coordinates The Appropriate Application Operations. Separating These Responsibilities Makes Applications Easier To Understand, Maintain, Test, And Modify.

30. What Is Microservices Architecture?

Ans:

Microservices Architecture Is A Software Architecture In Which A Large Application Is Divided Into Smaller, Independently Deployable Services. Each Service Generally Focuses On A Specific Business Capability And Can Be Developed, tested, Deployed, And Scaled Independently. Services Usually Communicate With Each Other Through APIs, Messaging Systems, Or Other Network-Based Protocols. This Architecture Can Improve Flexibility Because Individual Services Can Be Modified Without Rebuilding The Entire Application. However, Microservices Also Introduce Additional Complexity Related To Monitoring, Service Discovery, Security, Communication, And Distributed Transactions.

31. What Is Monolithic Architecture?

Ans:

• Monolithic Architecture Packages Most Or All Major Application Components Into A Single Deployable Application Unit. Frontend Serving, Business Logic, API Handling, And Database Access May Be Organized Within The Same Application Deployment. 
• This Architecture Is Usually Easier To Develop, Test, And Deploy During The Early Stages Of A Project. However, As The Application Becomes Larger, The Codebase Can Become More Difficult To Maintain And Modify. 
• Scaling Individual Features Independently Can Also Be Challenging Because The Entire Application May Need To Be Scaled.

32. What Is SQL?

Ans:

SQL Stands For Structured Query Language And Is Used To Communicate With Relational Database Management Systems. It Supports Operations Such As SELECT, INSERT, UPDATE, And DELETE For Retrieving And Modifying Data. SQL Can Also Filter, Sort, Group, And Join Data From Multiple Tables According To Application Requirements. Database Constraints Can Be Used To Maintain Data Integrity And Enforce Relationships Between Tables. Indexes Can Improve Query Performance By Helping The Database Locate Required Records More Efficiently. SQL Is Commonly Used With Relational Databases Such As MySQL, PostgreSQL, SQL Server, And Oracle.

33. What Is The Difference Between SQL And NoSQL?

Ans:

Aspect	SQL	NoSQL
Data Structure	Stores Data In Tables With Rows And Columns.	Stores Data Using Documents, Key-Value Pairs, Graphs, Or Other Models.
Schema	Generally Uses A Fixed And Structured Schema.	Usually Supports A Flexible Schema.
Relationships	Supports Complex Relationships Through JOINs And Foreign Keys	Often Uses Embedded Or Referenced Data Instead Of Traditional JOIN
Use Cases	Suitable For Structured And Transactional Applications.	Suitable For Flexible, Large-Scale, And Distributed Data Applications.

34. What Is A Primary Key?

Ans:

A Primary Key Is A Column Or Combination Of Columns Used To Uniquely Identify Each Record Within A Database Table. It Prevents Duplicate Identifying Values And Allows Individual Records To Be Referenced Reliably. A Primary Key Normally Cannot Contain NULL Values Because Every Record Must Have A Valid Identifier. A Table Can Use A Single Column As Its Primary Key Or Use Multiple Columns Together As A Composite Primary Key. Primary Keys Are Also Important For Establishing Relationships Between Tables Through Foreign Keys.

35. What Is A Foreign Key?

Ans:

GA Foreign Key Is A Column Or Set Of Columns That Creates A Relationship Between A Table And A Key In Another Table. It Helps Maintain Referential Integrity By Ensuring That Related Records Refer To Valid Data. For Example, An Orders Table Can Contain A Customer ID That References The Primary Key Of A Customers Table. Foreign Key Constraints Can Prevent Records From Containing Invalid References To Non-Existing Parent Records. Database Systems Can Also Define Appropriate Actions When Referenced Records Are Updated Or Deleted.

36. What Is Database Normalization?

Ans:

Database Normalization Is A Database Design Technique Used To Organize Data And Reduce Unnecessary Data Redundancy. It Divides Data Into Related Tables Based On Logical Relationships And Dependencies. First Normal Form Generally Requires Data To Be Atomic And Properly Structured Without Repeating Groups. Second And Third Normal Forms Further Reduce Redundancy By Addressing Partial And Transitive Dependencies. Normalization Can Improve Data Consistency Because The Same Information Does Not Need To Be Repeated In Multiple Places.s.

37. What Is An SQL JOIN?

Ans:

An SQL JOIN Is Used To Combine Rows From Two Or More Tables Based On Related Columns Or Conditions. An INNER JOIN Returns Records That Have Matching Values In Both Tables. A LEFT JOIN Returns All Records From The Left Table Along With Matching Records From The Right Table, And Missing Matches Generally Produce NULL Values. A RIGHT JOIN Works Similarly By Preserving Records From The Right Table. A FULL OUTER JOIN Returns Matching And Non-Matching Records From Both Tables.

38. What Is An Index In A Database?

Ans:

A Database Index Is A Data Structure That Helps The Database Locate Required Rows More Efficiently During Query Execution. Indexes Are Commonly Created On Columns That Are Frequently Used In Search Conditions, Sorting, Or JOIN Operations. They Can Significantly Improve SELECT Query Performance By Reducing The Amount Of Data That Must Be Scanned. However, Indexes Require Additional Storage Space And Must Be Maintained When Records Are Inserted, Updated, Or Deleted.

39. What Is A Transaction?

Ans:

• A Transaction Is A Logical Group Of Database Operations That Are Treated As A Single Unit Of Work. Transactions Help Maintain Data Consistency When Multiple Database Changes Must Be Completed Together. 
• The ACID Properties Describe Important Characteristics Of Reliable Database Transactions. Atomicity Ensures That All Operations In A Transaction Are Completed Successfully Or The Transaction Is Rolled Back. 
• Consistency Ensures That Database Rules And Constraints Remain Valid Before And After The Transaction.

40. What Is MongoDB?

Ans:

• MongoDB Is A NoSQL Database That Stores Data In Document-Oriented Structures Instead Of Traditional Relational Tables. 
• MongoDB Documents Are Stored In BSON, Which Is A Binary Representation Similar In Structure To JSON. Related Documents Are Organized Into Collections, Which Can Be Compared Conceptually With Tables In Relational Databases. 
• MongoDB Supports Flexible Document Structures, Allowing Different Documents To Have Different Fields When Appropriate.

41. What Is Git?

Ans:

Git Is A Distributed Version Control System Used To Track Changes In Source Code And Manage Different Versions Of A Software Project. It Allows Multiple Developers To Work On The Same Project Without Losing Or Overwriting Each Other’s Changes. Developers Can Create Branches To Develop Features, Fix Bugs, Or Experiment With Changes Independently. Git Provides Commands Such As Clone, Pull, Commit, Push, Merge, And Rebase For Managing Code Changes. Git Also Maintains A History Of Commits, Which Makes It Easier To Identify Changes And Restore Earlier Versions When Necessary.

42. What Is GitHub?

Ans:

GitHub Is A Cloud-Based Platform Used For Hosting, Managing, Reviewing, And Collaborating On Git Repositories. It Allows Developers To Store Source Code Remotely And Work Together On Software Projects. GitHub Provides Features Such As Pull Requests, Code Reviews, Issues, Discussions, And Project Management Capabilities. Developers Can Create Branches, Submit Changes, And Request Reviews Before Merging Code Into A Main Branch. GitHub Actions Can Also Be Used To Automate Tasks Such As Testing, Building, And Deployment. It Helps Development Teams Maintain Code History And Collaborate Effectively.

43. What Is A Git Branch?

Ans:

A Git Branch Is An Independent Line Of Development Used To Work On Code Changes Without Directly Modifying Another Branch. Developers Commonly Create Separate Branches For New Features, Bug Fixes, Experiments, Or Release Preparation. Changes Made On One Branch Can Be Tested Independently Before Being Merged Into The Main Development Branch. Branching Helps Multiple Developers Work On Different Tasks At The Same Time With Reduced Risk Of Conflicting Changes. After Development And Testing Are Completed, The Branch Can Be Merged Into Another Branch Through A Merge Operation Or Pull Request.

44. What Is A Pull Request?

Ans:

• A Pull Request Is A Mechanism Used To Propose Changes From One Git Branch To Another Branch, Usually Through A Collaboration Platform Such As GitHub. 
• It Allows Developers To Submit Completed Code For Review Before The Changes Are Integrated Into The Target Branch. 
• Other Team Members Can Review The Code, Add Comments, Suggest Improvements, And Approve Or Request Changes. Automated Tests And Build Checks Can Also Run During The Pull Request Process To Identify Problems Before Merging.

45. What Is CI/CD?

Ans:

CI/CD Refers To Continuous Integration And Continuous Delivery Or Continuous Deployment And Represents Practices Used To Automate Software Development And Release Processes. Continuous Integration Encourages Developers To Frequently Integrate Code Changes Into A Shared Repository And Automatically Run Builds And Tests. Continuous Delivery Ensures That Validated Software Can Be Prepared For Release Through An Automated Pipeline. Continuous Deployment Goes Further By Automatically Releasing Successfully Validated Changes To Production.

46. What Is Docker?

Ans:

Docker Is A Containerization Platform Used To Package An Application Along With Its Dependencies Into A Portable Container. Containers Provide A Consistent Runtime Environment So That Applications Can Behave More Predictably Across Development, Testing, And Production Systems. A Docker Image Contains The Application And Required Dependencies, While A Container Represents A Running Instance Of That Image. Dockerfiles Are Used To Define The Steps Required To Build Application Images. Docker Compose Can Help Run Multiple Related Containers Such As A Frontend, Backend, And Database Together. Docker Is Widely Used In Full Stack Development, CI/CD Pipelines, Cloud Deployments, And Microservices Architectures.

47. What Is Kubernetes?

Ans:

Kubernetes Is An Open-Source Container Orchestration Platform Used To Deploy, Manage, Scale, And Monitor Containerized Applications. It Can Automatically Schedule Containers Across Available Computing Nodes And Maintain The Desired Number Of Running Instances. Kubernetes Uses Objects Such As Pods, Deployments, Services, ConfigMaps, And Secrets To Manage Applications. If A Container Fails, Kubernetes Can Restart Or Replace It According To The Configured Desired State. It Can Also Support Horizontal Scaling And Service Discovery For Distributed Applications.

48. What Is AWS?

Ans:

AWS Stands For Amazon Web Services And Is A Cloud Computing Platform That Provides Infrastructure, Storage, Databases, Networking, Security, Monitoring, And Many Other Services. Developers Can Use AWS To Deploy Full Stack Applications Without Maintaining All Physical Infrastructure Directly. Services Such As EC2 Provide Compute Capacity, S3 Provides Object Storage, RDS Provides Managed Relational Databases, And Lambda Supports Serverless Computing. AWS Also Provides Networking Services Through VPC And Security Features Through IAM And Other Services.

49. What Is Amazon EC2?

Ans:

Amazon EC2 Stands For Elastic Compute Cloud And Provides Resizable Virtual Computing Capacity In The AWS Cloud. Developers Can Launch Virtual Servers Called Instances And Configure Their Computing Capacity According To Application Requirements. EC2 Instances Can Host Backend Applications, Web Servers, APIs, And Other Software Components. Instance Types Differ In CPU, Memory, Storage, And Networking Capabilities To Support Different Workloads.

50. What Is Amazon S3?

Ans:

• Amazon S3 Stands For Simple Storage Service And Is An Object Storage Service Designed For Storing And Retrieving Data At Scale. 
• Files Stored In S3 Are Called Objects And Are Organized Within Containers Known As Buckets. S3 Can Store Images, Videos, Documents, Backups, Logs, Application Assets, And Other Types Of Data. 
• Access To Objects Can Be Controlled Through IAM Policies, Bucket Policies, And Other Security Mechanisms. S3 Also Supports Features Such As Versioning, Lifecycle Management, Encryption, And Different Storage Classes.

51. What Is Unit Testing?

Ans:

AUnit Testing Is A Software Testing Technique Used To Test Individual Functions, Methods, Classes, Or Small Components In Isolation. The Main Purpose Of Unit Testing Is To Verify That A Small Piece Of Code Produces The Expected Result For Different Inputs And Conditions. Dependencies Can Be Replaced With Mocks, Stubs, Or Fakes So That The Unit Can Be Tested Independently. Unit Tests Usually Execute Quickly And Can Be Run Frequently During Development. Frameworks Such As JUnit For Java And Jest For JavaScript Are Commonly Used For Creating Unit Tests.

52. What Is Integration Testing?

Ans:

Integration Testing Verifies Whether Multiple Components Or Modules Work Correctly When They Interact With Each Other. It Can Test Communication Between Application Services, Databases, APIs, External Systems, Or Other Dependencies. For Example, An Integration Test Can Verify Whether A Backend Service Correctly Stores And Retrieves Information From A Database. Unlike Unit Testing, Integration Tests Often Use Real Or Test Versions Of Dependencies Instead Of Completely Mocking Them. These Tests Can Identify Configuration, Communication, Data Mapping, And Integration Problems.

53. What Is End-To-End Testing?

Ans:

The Event Loop Is A Core Mechanism That Allows Node.js To Handle End-To-End Testing Validates An Application Across Its Complete Workflow From The User Interface Through The Backend And Other Required Components. It Attempts To Simulate Real User Activities Such As Registering An Account, Logging In, Searching For Products, And Completing A Transaction. Tools Such As Selenium, Cypress, And Playwright Can Be Used To Automate End-To-End Tests. These Tests Can Detect Problems That May Not Be Identified Through Individual Unit Or Integration Tests.

54. What Is Selenium?

Ans:

Selenium Is An Open-Source Browser Automation Toolset Used Primarily For Testing Web Applications. It Allows Automated Tests To Interact With Web Elements Such As Buttons, Links, Forms, Menus, And Input Fields. Selenium WebDriver Provides A Standard Mechanism For Controlling Different Web Browsers Programmatically. Selenium Supports Multiple Programming Languages And Major Browsers, Making It Suitable For Different Technology Environments. It Is Commonly Used For Functional Testing, Regression Testing, Smoke Testing, And Cross-Browser Testing.

55. What Is Exception Handling?

Ans:

Exception Handling Is A Programming Mechanism Used To Manage Unexpected Conditions That Occur During Program Execution. It Helps Prevent Applications From Failing Without Controlled Processing When Errors Such As Invalid Input, Missing Resources, Or Database Failures Occur. Java Provides Constructs Such As Try, Catch, Finally, Throw, And Throws For Handling Exceptions. JavaScript Commonly Uses Try And Catch For Handling Synchronous Exceptions And Can Combine Them With Promise-Based Error Handling.

56. What Is Error Handling In REST APIs?

Ans:

• Error Handling In REST APIs Refers To The Process Of Detecting, Managing, And Communicating Problems That Occur During API Requests. 
• APIs Should Return Appropriate HTTP Status Codes According To The Type Of Error Encountered. Client-Side Problems Can Use Codes Such As 400, 401, 403, And 404, While Server-Side Problems Commonly Use 500-Level Status Codes. 
• API Responses Can Follow A Consistent Error Structure Containing Useful Information Such As An Error Code And General Message.

57. What Is Asynchronous Programming??

Ans:

Asynchronous Programming Allows Certain Operations To Execute Without Blocking The Main Execution Flow Of An Application. It Is Particularly Useful For Operations That May Take Time, Such As Network Requests, File Processing, Database Calls, And External API Communication. JavaScript Provides Promises And Async/Await To Work With Asynchronous Operations In A Structured Way. Node.js Uses An Event-Driven Architecture That Allows Many I/O Operations To Be Handled Efficiently. Proper Error Handling Is Important Because Asynchronous Operations May Fail Independently Of Other Application Operations.

58. What Is A Promise In JavaScript?

Ans:

A Promise In JavaScript Represents The Eventual Completion Or Failure Of An Asynchronous Operation And Its Result. A Promise Can Exist In One Of Three Main States: Pending, Fulfilled, Or Rejected. The Then Method Is Commonly Used To Process A Successfully Fulfilled Promise. The Catch Method Can Be Used To Handle A Rejected Promise And Process Errors. The Finally Method Can Execute Cleanup Logic Regardless Of Whether The Operation Succeeded Or Failed. Async/Await Provides Another Syntax For Working With Promises In A More Synchronous-Looking Style. Promises Help Developers Organize API Calls, Database Operations, And Other Asynchronous Tasks More Effectively.

59. What Is Async/Await?

Ans:

Async/Await Is A JavaScript Feature That Provides A Readable Way To Work With Promise-Based Asynchronous Operations. A Function Declared With The Async Keyword Always Returns A Promise. The Await Keyword Can Be Used Inside An Async Function To Wait For A Promise To Settle Before Continuing With The Next Statement. Try And Catch Blocks Can Be Used Around Awaited Operations To Handle Errors In A Structured Way. Async/Await Often Makes Complex Asynchronous Workflows Easier To Read Than Long Chains Of Then And Catch Calls. Developers Should Still Avoid Unnecessary Sequential Awaits When Independent Operations Can Run Concurrently.

60. What Is Event Loop In Node.js?

Ans:

The Node.js Event Loop Is A Core Mechanism That Coordinates Asynchronous Operations While Allowing JavaScript Execution To Remain Primarily Non-Blocking. It Enables Node.js To Handle Many I/O Operations Without Creating A Separate JavaScript Thread For Every Request. When An Asynchronous Operation Completes, Its Associated Callback Or Continuation Can Be Processed Through The Event Loop. Long-Running CPU-Intensive Operations Can Block The Event Loop And Prevent Other Tasks From Being Processed Efficiently.

61. What Is TypeScript?

Ans:

TypeScript Is A Superset Of JavaScript That Adds Static Typing And Other Features To The Language. It Supports Type Annotations, Interfaces, Generics, Classes, Enums, And Other Features That Help Developers Structure Large Applications. Static Type Checking Can Detect Many Programming Errors During Development Before The Application Is Executed. TypeScript Source Code Is Transpiled Into JavaScript That Can Run In Browsers Or JavaScript Runtime Environments. Angular Uses TypeScript As Its Primary Development Language, And It Is Also Commonly Used In Node.js Projects.

62. What Is Object-Oriented Programming?

Ans:

Object-Oriented Programming Is A Programming Approach That Organizes Software Around Objects And Classes. Important OOP Concepts Include Encapsulation, Inheritance, Polymorphism, And Abstraction. A Class Defines Properties And Behaviors That Can Be Used By Its Objects. Encapsulation Helps Protect Internal Data, While Inheritance Supports Reuse Of Common Functionality. Polymorphism Allows Different Objects To Provide Different Implementations Through Common Interfaces Or Methods. OOP Is Widely Used In Languages Such As Java, C#, Python, TypeScript, And Other Programming Languages.

63. What Is Encapsulation?

Ans:

• Encapsulation Is An Object-Oriented Programming Principle That Combines Data And Related Methods Within A Controlled Unit. It Helps Restrict Direct Access To Internal Data And Allows Access Through Defined Methods Or Interfaces. 
• Access Modifiers Such As Private, Protected, And Public Can Be Used In Many Programming Languages To Control Visibility. Encapsulation Helps Protect Application Data And Prevent Unintended Changes From Other Components. 
• It Also Improves Code Organization By Keeping Related Data And Operations Together. Proper Encapsulation Helps Create Secure, Maintainable, And Modular Software Applications.

64. What Is Inheritance?

Ans:

Inheritance Is An Object-Oriented Programming Concept That Allows One Class To Acquire Properties And Methods From Another Class. The Existing Class Is Commonly Called The Parent Class, Superclass, Or Base Class. The New Class Is Commonly Called The Child Class, Subclass, Or Derived Class. Inheritance Helps Reduce Duplicate Code By Allowing Common Functionality To Be Reused. A Child Class Can Add New Features Or Override Certain Behaviors When Supported By The Programming Language. It Is Useful For Representing Suitable Relationships Between Related Classes And Objects.

65. What Is Abstraction?

Ans:

Abstraction Is An Object-Oriented Programming Principle That Hides Complex Implementation Details And Exposes Only The Essential Behavior Required By Consumers. Interfaces And Abstract Classes Are Common Mechanisms Used To Implement Abstraction In Java. For Example, A Payment Interface Can Define Payment Operations Without Exposing The Internal Details Of A Particular Payment Provider. Consumers Can Work With The Abstraction Instead Of Depending Directly On A Specific Implementation. This Reduces Complexity And Allows Internal Implementations To Be Changed More Easily.

66. What Is SOLID?

Ans:

SOLID Is A Collection Of Five Object-Oriented Design Principles Used To Create Maintainable And Flexible Software. The Five Principles Are Single Responsibility Principle, Open/Closed Principle, Liskov Substitution Principle, Interface Segregation Principle, And Dependency Inversion Principle. Single Responsibility Encourages A Class To Have One Main Responsibility, While Open/Closed Encourages Extension Without Unnecessary Modification Of Existing Code. Liskov Substitution Focuses On Ensuring That Subtypes Can Properly Replace Their Base Types. Interface Segregation Encourages Small, Focused Interfaces Instead Of Large Interfaces With Unnecessary Methods.

67. What Is A Design Pattern?

Ans:

A Design Pattern Is A Reusable General Solution Approach To A Common Software Design Problem. Design Patterns Are Not Complete Programs Or Copy-Paste Code; Instead, They Provide Structures And Ideas That Can Be Adapted To Specific Requirements. Common Design Patterns Include Singleton, Factory, Strategy, Observer, Adapter, And Repository. Patterns Can Improve Communication Among Developers Because Common Names Describe Familiar Design Approaches.

68. What Is Dependency Inversion Principle?

Ans:

JDependency Inversion Principle Is The Fifth Principle Of The SOLID Design Principles. It States That High-Level Modules Should Not Depend Directly On Low-Level Concrete Implementations, And Both Should Depend On Abstractions. For Example, A Payment Service Can Depend On A Payment Interface Instead Of Directly Depending On One Specific Payment Provider. This Allows Different Implementations To Be Substituted Without Changing The High-Level Business Logic. Dependency Inversion Also Makes Unit Testing Easier Because Mock Or Fake Implementations Can Be Provided During Tests.

69. What Is Caching?

Ans:

Caching Is A Technique Used To Store Frequently Accessed Data In A Faster Storage Layer So That Repeated Requests Can Be Served More Quickly. It Can Reduce Database Load, Network Traffic, Processing Time, And Overall Application Response Time. Browser Caching Can Store Static Resources Such As Images, JavaScript Files, And CSS Files. Server-Side Caching Can Store Frequently Requested Application Data Or API Responses. Redis Is A Common Technology Used For Fast In-Memory Caching In Distributed Applications.

70. What Is Redis?

Ans:

Redis Is An In-Memory Data Store Commonly Used For Caching, Fast Data Access, Session Storage, And Certain Messaging Use Cases. It Supports Several Data Structures, Including Strings, Lists, Sets, Sorted Sets, And Hashes. Redis Can Store Temporary Application Data With Expiration Times, Which Makes It Useful For Time-Sensitive Cache Entries. Because Data Is Primarily Accessed From Memory, Redis Can Provide Very Fast Read And Write Operations. It Can Also Support Replication And Distributed Deployment Configurations Depending On The Architecture.

71. What Is Load Balancing?

Ans:

Load Balancing Is The Process Of Distributing Incoming Network Requests Across Multiple Servers Or Application Instances. Its Main Purpose Is To Prevent Individual Servers From Becoming Overloaded While Improving Application Availability And Scalability. A Load Balancer Can Use Strategies Such As Round Robin, Least Connections, Or Other Routing Methods. Health Checks Can Be Used To Detect Unavailable Instances And Prevent New Requests From Being Sent To Them. Load Balancing Is Especially Useful When Backend Applications Are Running Multiple Instances.

72. What Is Scalability?

Ans:

Scalability Is The Ability Of A System To Handle Increasing Workloads While Maintaining Acceptable Performance And Reliability. Vertical Scaling Involves Increasing The CPU, Memory, Storage, Or Other Resources Of An Existing Server. Horizontal Scaling Involves Adding More Servers Or Application Instances To Handle Additional Traffic. Stateless Backend Services Are Often Easier To Scale Horizontally Because Requests Can Be Distributed Across Multiple Instances. Load Balancing, Caching, Database Optimization, And Asynchronous Processing Can Also Support Scalability.

73. What Is Authentication Using OAuth?

Ans:

OAuth Is An Authorization Framework That Allows An Application To Obtain Limited Access To Resources On Behalf Of A User Without Requiring The Application To Receive The User’s Password. It Uses Access Tokens To Represent The Permissions Granted To A Client Application. Modern Implementations Commonly Use OAuth 2.0 Concepts And Flows Depending On The Application Type. OpenID Connect Extends OAuth 2.0 To Provide An Identity Layer For Authentication And User Information. Access Tokens Should Be Protected And Should Have Appropriate Scopes And Lifetimes.

74. What Is API Rate Limiting?

Ans:

• API Rate Limiting Is A Mechanism Used To Control The Number Of Requests A Client Can Make During A Specific Period. It Helps Protect APIs From Excessive Traffic, Accidental Overuse, Abuse, And Certain Denial-Of-Service Scenarios. 
• Limits Can Be Applied According To User Account, IP Address, API Key, Client Application, Or Other Identifiers. When A Client Exceeds The Allowed Limit, The API Can Return HTTP Status Code 429 To Indicate Too Many Requests. 
• Rate Limiting Can Be Implemented At An API Gateway, Reverse Proxy, Or Application Middleware Layer. Different Endpoints Can Have Different Limits Depending On Their Computational And Business Requirements.

75. What Is API Versioning?

Ans:

API Versioning Is A Technique Used To Manage Changes To An API While Reducing The Risk Of Breaking Existing Consumers. Different Versions Can Be Represented Through URL Paths, Request Headers, Query Parameters, Or Other Versioning Strategies. For Example, An Application May Maintain Separate API Versions When A Response Structure Or Endpoint Contract Changes Significantly. Backward Compatibility Should Be Considered Before Introducing Changes To Existing APIs.

76. What Is WebSocket?

Ans:

WebSocket Is A Communication Protocol That Provides Persistent Two-Way Communication Between A Client And Server. Unlike Traditional HTTP Request-Response Communication, A WebSocket Connection Allows The Server To Send Data To The Client Whenever Necessary After The Connection Has Been Established. This Makes WebSockets Suitable For Applications That Require Real-Time Or Near Real-Time Communication. Chat Applications, Live Notifications, Collaborative Tools, Online Gaming, And Real-Time Dashboards Can Use WebSocket Connections.

77. What Is AJAX?

Ans:

AJAX Stands For Asynchronous JavaScript And XML And Refers To Techniques For Communicating With A Server Without Reloading The Entire Web Page. Modern AJAX Implementations Commonly Use JSON Instead Of XML For Exchanging Data Between Frontend And Backend Systems. JavaScript APIs Such As Fetch And Libraries Such As Axios Can Be Used To Make Asynchronous HTTP Requests. AJAX Allows Specific Parts Of A Web Page To Be Updated Dynamically After Data Is Received From The Server.

78. What Is Fetch API?

Ans:

Fetch API Is A Modern JavaScript Interface Used To Make HTTP Requests From Web Applications. It Returns A Promise And Supports Common HTTP Methods Such As GET, POST, PUT, PATCH, And DELETE. Request Headers, Request Bodies, Credentials, And Other Options Can Be Configured According To Application Requirements. The Returned Response Object Provides Access To HTTP Status Information, Headers, And Response Data. Fetch Does Not Automatically Reject Its Promise For HTTP Error Status Codes Such As 404 Or 500, So Applications Should Explicitly Check Response Status When Necessary.

79. What Is Axios?

Ans:

Axios Is A JavaScript HTTP Client That Can Be Used In Browser And Node.js Applications To Communicate With APIs. It Supports Common HTTP Methods Such As GET, POST, PUT, PATCH, And DELETE. Axios Provides Features Such As Request Configuration, Interceptors, Automatic JSON Transformation, Timeouts, And Request Cancellation. Interceptors Can Be Used To Add Authentication Tokens Or Handle Common Response Errors Centrally. Axios Can Simplify API Communication In Applications That Require More Advanced HTTP Client Features.

80. How Can A Full Stack Application Be Secured?

Ans:

• A Full Stack Application Should Be Secured Across The Frontend, Backend, Database, API, And Infrastructure Layers. Authentication And Authorization Should Ensure That Only Valid Users Can Access Appropriate Resources. 
• Passwords Should Be Stored Using Secure Password-Hashing Mechanisms, And Sensitive Data Should Be Encrypted Where Appropriate. 
• User Input Should Be Validated And Properly Handled To Reduce Risks Such As SQL Injection And Cross-Site Scripting.

81. What Is SQL Injection?

Ans:

• SQL Injection Is A Security Vulnerability That Can Occur When Untrusted User Input Is Unsafe­ly Incorporated Into SQL Queries. 
• An Attacker May Manipulate The Input In A Way That Changes The Intended Database Query And Potentially Accesses Or Modifies Unauthorized Data. 
• Parameterized Queries And Prepared Statements Are Important Techniques For Preventing SQL Injection. Modern ORM And Database Libraries Can Also Provide Safer Query APIs When They Are Used Correctly.

82. What Is Cross-Site Scripting?

Ans:

Caching Is A Technique Used To Temporarily Store Frequently Accessed Cross-Site Scripting, Commonly Called XSS, Is A Web Security Vulnerability In Which Untrusted Content Is Executed As Script In A User’s Browser. Stored XSS Can Occur When Malicious Content Is Saved By An Application And Later Displayed To Other Users. Reflected XSS Can Occur When Unsafe Input Is Returned Directly In A Web Response. Output Encoding, Safe Rendering Practices, Input Handling, And Appropriate Content Security Policies Can Help Reduce XSS Risks. Modern Frontend Frameworks Often Escape Text By Default, But Developers Can Still Introduce Vulnerabilities Through Unsafe APIs Or Improperly Rendered HTML. User-Supplied Content Should Always Be Treated As Untrusted.

83. How Does Optimize A Slow Web Application?

Ans:

Optimizing A Slow Web Application Starts With Measuring The Application To Identify The Actual Performance Bottlenecks. Frontend Optimization Can Include Code Splitting, Lazy Loading, Image Optimization, Efficient Rendering, And Reducing Unnecessary JavaScript. Backend Performance Can Be Improved Through Caching, Efficient Algorithms, Database Query Optimization, And Reducing Unnecessary Processing. Database Indexes Can Improve Frequently Executed Queries When They Match Actual Access Patterns.

84. How does Optimize Database Queries?

Ans:

Database Query Optimization Begins By Identifying Expensive Queries And Examining Their Execution Plans. Appropriate Indexes Can Improve Filtering, Joining, Sorting, And Other Frequently Used Operations. Queries Should Retrieve Only The Required Columns And Rows Instead Of Unnecessarily Processing Large Amounts Of Data. Repeated Database Calls, Inefficient Nested Queries, And Unnecessary Joins Should Be Reviewed And Optimized. Pagination Or Batching Can Help When Applications Need To Process Large Numbers Of Records. Database Statistics, Configuration, Schema Design, And Hardware Resources Can Also Affect Query Performance. Query Changes Should Be Tested Against Realistic Data Volumes To Confirm That They Actually Improve Performance.

85. How does Handle Large Data In A Web Application?

Ans:

Large Data Sets Should Usually Be Processed Incrementally Instead Of Loading The Entire Dataset Into Application Memory. Pagination Can Limit The Number Of Records Returned In A Single API Response And Reduce Frontend Processing. Cursor-Based Pagination Can Be Useful For Large Or Frequently Changing Datasets Because It Can Avoid Some Problems Associated With Large Offset Values. Database Queries Should Use Appropriate Indexes, Filters, And Sorting Strategies To Reduce Unnecessary Processing. Background Jobs Can Handle Long-Running Data Processing Without Blocking Normal User Requests.

86. How does Debug A Full Stack Application?

Ans:

Debugging A Full Stack Application Begins By Reproducing The Problem And Clearly Identifying Which Application Layer Is Affected. Browser Developer Tools Can Help Inspect Console Errors, Network Requests, Response Data, And Frontend Behavior. Backend Logs Can Provide Information About API Processing, Authentication, Business Logic, And Database Operations. Database Queries Can Be Tested Separately To Determine Whether The Problem Is Related To Data Or Query Logic. Debuggers And Breakpoints Can Help Trace Program Execution And Inspect Variables At Specific Points.

87. How does Manage A Full Stack Project In A Team?

Ans:

• A Full Stack Project Should Begin With Clear Requirements, Defined Responsibilities, And An Understandable Technical Architecture. 
• Git Branching And Pull Requests Can Help Team Members Work On Features And Bug Fixes Without Directly Interfering With Each Other’s Changes. Coding Standards, Automated Testing, And Code Reviews Help Maintain Consistent And Reliable Code. 
• Agile Development Practices Can Help Teams Deliver Features Incrementally And Respond To Changing Requirements.

88. Explain A Typical Full Stack Project Architecture.

Ans:

A Typical Full Stack Application Contains Several Logical Layers, Including The Frontend, Backend API, Business Logic, Data Access, Database, And Infrastructure. The Frontend Can Be Built Using Technologies Such As React Or Angular And Provides The User Interface And Client-Side Interactions. The Backend Can Use Technologies Such As Spring Boot Or Node.js To Process Requests And Implement Business Rules. The Database Stores Persistent Application Information And Can Be Relational Or NoSQL Depending On Requirements. Authentication And Authorization Protect Backend Resources And Control Access To Application Features.

89. How Would Design A Scalable Full Stack Application?

Ans:

Designing A Scalable Full Stack Application Starts With Separating The Presentation, Business Logic, Data Access, And Infrastructure Responsibilities. Stateless Backend Services Can Be Deployed Across Multiple Instances Behind A Load Balancer To Handle Increasing Traffic. Caching Can Reduce Repeated Database Queries And Improve Response Times For Frequently Requested Data. Database Performance Can Be Improved Through Proper Schema Design, Indexing, Query Optimization, And Appropriate Scaling Strategies. Asynchronous Messaging And Background Processing Can Handle Long-Running Tasks Without Blocking User Requests.

90. Why Should Accenture Hire A Full Stack Developer?

Ans:

A Strong Full Stack Developer Should Have A Practical Understanding Of Frontend Development, Backend Programming, Databases, REST APIs, Testing, Version Control, And Deployment Concepts. Problem-Solving Skills Are Important For Understanding Business Requirements, Identifying Technical Issues, And Developing Effective Solutions. Knowledge Of Clean Coding Practices And Software Design Principles Helps Produce Maintainable And Reliable Applications.