Other Companies (Name Not Shared) Angular Interview Questions for Lead / Technical Lead
Shared question set for Lead / Technical Lead of experience, Lead Full Stack Developer. Topics and wording follow the supplied notes; these are questions, not official company guidance.
- What is Angular, and how is it different from React?
- Explain Angular components, directives, pipes and services.
- What is Dependency Injection (DI), and how does Angular's hierarchical injector work?
- What is the difference between standalone components and NgModules?
- Explain Angular's change detection mechanism and the role of Zone.js.
- What is the difference between Observable and Promise?
- Explain the differences between switchMap, mergeMap, concatMap and exhaustMap.
- What are Signals in Angular, and how do they compare with RxJS?
- What is the difference between Subject, BehaviorSubject and ReplaySubject?
- How do you prevent memory leaks in Angular applications?
- How do you optimize the performance of a large-scale Angular application?
- What is OnPush change detection, and when should you use it?
- How do lazy loading and route-level code splitting work?
- What are trackBy and track used for in list rendering?
- How would you identify and resolve unnecessary component re-rendering or slow UI updates?
- How would you design a scalable Angular application for an enterprise?
- How do you implement state management using NgRx, Signals or services?
- What are HTTP interceptors, and how do you handle authentication and token refresh?
- How do you protect Angular applications against XSS and other common security risks?
- How do you write unit tests and integration tests for Angular applications?
- How would you migrate a legacy Angular application to the latest supported Angular version?
- How would you structure a large application with multiple teams working on different features?
- How would you handle API failures, retries, loading states and global error handling?
- How would you review Angular code and enforce coding standards across a development team?
- How would you troubleshoot a slow Angular application in production and decide which optimizations to prioritize?