Interview Questions to Ask a Mobile App Developer Candidate
Questions that surface real evidence of shipped, well-rated mobile apps, not just completed feature tickets — plus what to actually listen for in the answer, not just whether they say the right buzzwords.
1. How do you design a mobile app so it still works sensibly when the user has a weak or lost connection?
What to listen for: Look for local caching, queued actions, clear status messages, conflict handling when syncing, and testing on poor networks instead of only fast office wifi.
2. Users report the app drains battery and feels slow on older phones. How do you track down the cause?
What to listen for: A good answer uses profiling tools, checks background work, network calls, and images, and verifies the improvement on real older devices.
3. Your app store release was rejected for a privacy reason. How do you handle the review and the fix?
What to listen for: Expect reading the guideline carefully, minimising data collection, updating the privacy disclosures, and treating user permissions as a trust issue, not a hurdle.
4. A critical crash affects a small share of users right after release. Do you pull the release, hotfix, or wait?
What to listen for: The candidate weighs crash reports, the number of users affected, staged rollout controls, and the speed of a safe fix before choosing.
5. What would you do in your first 30 days in this mobile app developer role?
What to listen for: Whether their plan is grounded in the role's actual must-haves (ios (swift) or android (kotlin) development and cross-platform frameworks (react native/flutter) if applicable) or generic ("get to know the team"). Specificity here signals real understanding of the job, not just interview prep.
6. Why are you leaving your current role, and why this one specifically?
What to listen for: Forward-looking motivation tied to something concrete about this role, versus badmouthing a past employer or vague dissatisfaction. Watch for whether their reasons actually match what this role offers.
A warning sign in this interview
Tests only on a single new phone or simulator, ignores permissions and privacy, or cannot describe how they would know a release is crashing for real users.
What to look for on the CV before the interview
Apps published, store ratings and the codebase size.
Confirm before you make an offer
Apps published in the stores are the best evidence.
People who may apply under another title
This job is also called iOS Developer, Android Developer, React Native Developer, Mobile Engineer. A candidate with one of those titles can be a strong match, so ask the same questions and judge the answers, not the title.
Frequently asked questions
How many of these questions should I ask in one interview?
3-4 is realistic for a 30-45 minute interview once you leave room for follow-ups and the candidate's own questions. Divide competencies across panel members rather than every interviewer asking all of them — see the Interview Scorecard tool for a structured version of this.
How is this different from the Interview Scorecard tool?
This page is a generic starting point for the mobile app developer role. The tool generates a full panel-ready kit — competency-grouped questions, a 1-5 rating rubric, and strong/weak answer examples — tailored to your actual job description and competencies.
What is a red flag when interviewing a mobile app developer?
Tests only on a single new phone or simulator, ignores permissions and privacy, or cannot describe how they would know a release is crashing for real users.
What should I confirm before offering a mobile app developer the job?
Apps published in the stores are the best evidence.
Hiring a mobile app developer? The rest of the toolkit
- How to write the job description →
Titles, must-haves, credentials and a starting posting.
- Search strings to find candidates →
Five searches from broad to narrow, with exclusions.
- Run the whole hire in one place →
Jobs, CV review, interviews, offers and checks together.