Backend for mobile apps interview questions
Push at scale, time zones, backend-for-frontend, offline sync, minimum app versions, image delivery, purchase verification and API performance on mobile networks.
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Questions
- Sending push notifications at scaleOrder the steps
- Time zones and timestampsPredict
- Backend for frontend (BFF)Pick the fix
- An API for offline syncPredict
- Minimum supported app versionsPredict
- Serving images to mobile appsPick the fix
- Verifying in-app purchases on the serverOrder the steps
- API performance on mobile networksPick the fix
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Flashcards · 12
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Quick quiz · 8 questions
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Mock interview · 1 set
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Quick facts
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US DST end 2026
US daylight saving time ends on Sunday 1 November 2026, so New York is UTC−4 on 31 October.
India offset
Asia/Kolkata is UTC+5:30 all year; India doesn't use daylight saving.
Google Play acknowledgement
Purchases not acknowledged within three days are automatically refunded.
timestamptz
PostgreSQL stores timestamptz as a UTC instant and displays it in the session's TimeZone.
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Sources: Topic outline informed by System Design Primer by Donne Martin and the Zalando RESTful API Guidelines, both licensed under CC BY 4.0. Every question and answer is written by Best Latest Apps. Credits and license