18Software Engineering · Interview Prep · Free
Angular Developer interview questions — and how to answer them.
These are the questions Angular Developer candidates are most likely to face, from openers to the hard ones — each with a note on what a strong answer covers. Want more, tuned to your level? Use the free generator below.
What interviewers look for in a Angular Developer
- Concrete examples of systems you've built, with the trade-offs you weighed
- How you debug — the process, not just the fix
- Collaboration signals: code review, disagreements, mentoring
Likely Angular Developer interview questions
1. Tell us about your experience with Angular. How long have you been working with it?
Mention specific versions, projects, and key features you've used (components, services, RxJS).
2. What's the difference between Angular and AngularJS?
Highlight TypeScript, component-based architecture, dependency injection improvements, and performance gains.
3. Explain the Angular component lifecycle. What are the main hooks?
Cover OnInit, OnDestroy, OnChanges, DoCheck, and explain when/why you'd use each.
4. How do you handle HTTP requests in Angular? Walk us through your approach.
Discuss HttpClientModule, observables, error handling, interceptors, and unsubscribe patterns.
5. What's the difference between property binding, event binding, and two-way binding?
Explain syntax ([property]=, (event)=, [(ngModel)]=) and use cases for each.
6. How do you share data between components in Angular?
Cover @Input/@Output, services with subjects/BehaviorSubject, and state management patterns.
7. Describe how RxJS observables work and why they're important in Angular.
Explain subscriptions, operators (map, filter, switchMap), unsubscribe best practices, and memory leaks.
8. What is dependency injection and how does it work in Angular?
Explain providers, injectable decorator, service scopes, and how it improves testability.
9. How do you structure a large Angular application? What are best practices?
Discuss feature modules, lazy loading, shared modules, folder structure, and separation of concerns.
10. Explain the difference between OnPush and Default change detection strategies. When would you use each?
Discuss performance optimization, immutability, when components update, and profiling scenarios.
11. Walk us through how you'd implement form validation in Angular with complex async rules.
Cover Reactive Forms, custom validators, async validators, cross-field validation, and error display patterns.
12. How would you debug a performance issue in a large Angular application? What tools would you use?
Mention Angular DevTools, Chrome DevTools, change detection profiling, memory leaks, bundle analysis, and optimization strategies.
Want to practice answering live with scored feedback? Try the Mock Interview Coach. Applying too? See a Angular Developer cover letter example.
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