Exprience Angular Interview Questions That Asked Me From TCS, Infosys & Capgemini .

I failed lots of interviews at big service-based companies. Not because I couldn’t code. But because I didn’t know what they actually ask. After 6 months of collecting real questions from TCS, Infosys, Capgemini, and HCL etc. here’s the exact checklist that got me hired.

🔹 Angular Advanced (90% Interviewers get stuck here)

• RxJS usage in Angular project
• Observable vs Promise vs Async/Await
• Subscription and Promise difference
• How to handle errors in Angular
• What is Bootstrapping in Angular
• Angular Services (why singleton?)
• EventEmitter and Enum
• Lifecycle hooks execution sequence
• Change Detection Strategy and purpose
• Zone.js in Angular (purpose)
• How ngOnChanges triggers
• Stack management in Angular
• Angular compilation process
• AOT vs JIT compilation
• How Angular works internally

🔹 Angular Forms & Validation

• Validation in Angular forms
• Custom directive for mouse hover
• Where to use Reactive Forms vs Template Forms
• Template set zone variable

🔹 Angular Routing & Data Flow

• Query params in route
• How to send data from one component to another
• Parent to child and child to parent communication
• Routing management in Angular

🔹 HTTP & API

• HttpClient methods in Angular
• API integration (GET/POST etc.)
• Authentication vs Authorization

🔹 PWA & Performance

• What is PWA
• Service Workers in PWA
• Manifest file purpose
• Caching strategies
• Responsive design importance in PWA
• Angular optimization techniques

🔹 JavaScript / TypeScript

• Arrow function description
• Optional chaining
• Call by value vs Call by reference
• IIFE
• Higher-order functions
• Immutability vs Mutability
• Map two objects

🔹 CSS / UI (for UI Developer role)

• Flexbox: center a div
• Inline vs Block vs Inline-block
• Position in CSS
• Fixed vs Absolute positioning
• Add element in 4th position using splice
• Difference between odd/even elements styling

🔹 Git & CI/CD

• Use of Git
• CI/CD concept
• Git commands (status, commit, etc.)
• How to recover lost commit

🔹 Misc / Practical

• SEO — Communication
• Interceptors in Angular (types & usage)
• Execution flow of Angular project
• Custom directive example
• Sorting array in ascending order
• Find and FindIndex difference
• Sending notifications
• Service worker working flow