Senior Android interviews evaluate decisions, trade-offs and operational experience rather than API recall. Strong answers state assumptions, compare alternatives and explain how the result would be measured.
Practical guidance
- Architecture: explain ownership, module boundaries and failure handling.
- Concurrency: discuss cancellation, structured concurrency and race prevention.
- Compose: explain state hoisting, effects, stability and performance measurement.
- Delivery: cover testing strategy, observability, rollout and incident learning.
Working example
Question: How would you design an offline-first feed?
Answer outline:
1. Room is the observable source of truth.
2. Paging reads local data and RemoteMediator coordinates fetches.
3. Transactions update items and remote keys atomically.
4. WorkManager retries durable sync with backoff.
5. Metrics track freshness, failures and cache hit rate.Common mistakes
- Naming patterns without explaining why they fit the constraints.
- Claiming one architecture is always best.
- Ignoring migration, monitoring and team ownership.
Key takeaway
Practice reasoning aloud. A senior answer connects code structure to user impact, reliability, delivery cost and evidence.