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A mid-level developer delivers features well. A senior developer also decides how features should be built, foresees problems, raises the quality of others' work, and handles ambiguity. Interviews are designed to find evidence of those behaviours.
What interviewers look for
The typical interview loop
| Round | What it tests | How to prepare |
|---|---|---|
| Coding (DS&A or practical Android) | Problem solving, clean Kotlin | Practise medium problems in Kotlin and small Android features. See Coding Problems |
| Android deep dive | Lifecycle, coroutines, Compose, performance, memory | Top 50 questions, Coroutines questions |
| Mobile system design | Structured design, trade-offs | System design guide; practise 4–5 prompts aloud |
| Architecture / code review | Spotting issues, proposing improvements | Review real PRs critically; know common anti-patterns |
| Behavioural | Ownership, collaboration, conflict, impact | Prepare 8–10 stories with outcomes |
Preparing behavioural stories
Use a simple structure (situation, task, action, result) and focus on your decisions and measurable outcomes. Prepare stories for:
- A technical decision you drove, and its trade-offs.
- A production incident you handled, and what changed afterwards.
- Improving performance or stability (with numbers if you have them).
- Mentoring someone, or raising code-review standards.
- Disagreeing with a product or engineering decision.
- A failure, and what you learned from it.
"Reduced cold start from X to Y on mid-range devices by deferring SDK initialisation and adding a Baseline Profile" is far stronger than "improved performance". Use honest numbers you can explain.
A 4-week preparation plan
- Week 1: fundamentals refresh: lifecycle, process death, coroutines, Flow, Compose state and effects.
- Week 2: architecture and system design: practise three designs aloud (feed, chat, offline notes).
- Week 3: performance, testing and security deep dives; coding practice in Kotlin.
- Week 4: behavioural stories, mock interviews, review weak areas.
Questions to ask them
- How are architecture decisions made and documented?
- What's the state of testing, CI and release process?
- How do Android engineers collaborate with product, design and backend?
- What does success look like for this role in six months?
Common pitfalls
Only "we"
Describe your specific contributions, not just the team's.
Dogmatic answers
"Always Clean Architecture" signals inexperience. Talk about context.
No trade-offs
Every senior decision has costs. Name them.
Frequently asked questions
How many years make someone "senior"?
Titles vary by company. Interviews look for behaviours (ownership, judgement, influence) more than years.
Will AI tools come up?
Increasingly: how you use AI coding tools responsibly, and how you'd add AI features safely. See AI and Android Work.
Conclusion
Prepare for senior Android interviews across depth, design, ownership, influence and judgement: refresh fundamentals, practise system design aloud, sharpen coding, and prepare honest stories with real outcomes.
Next step: map your growth with Android Developer Roadmap: Junior to Senior.
Official references
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