IntermediatePROBLEM_SOLVING
When you found a production crash related to Retrofit network calls and JSON parsing on a narrow set of devices, what steps did you take to reproduce, diagnose, and deploy a fix while minimizing user impact?
Android Developer
General

Sample Answer

I noticed a spike in crashes affecting about 0.4% of our active users (~8k/day) concentrated on older Samsung and Xiaomi phones. I triaged the issue by filtering crash logs in Sentry to device models and OS versions, then reproduced it using Firebase Test Lab devices and a set of recorded failing responses. The root cause was unexpected nulls and a missing field in a nested JSON array that our Gson adapters assumed non-null. I pushed a hotfix: defensive parsing with Moshi's nullable types, a graceful fallback, and a retry with exponential backoff. We phased rollout via Play Store staged releases to 5% then 50% then 100% over 24 hours, monitored crash rate (dropped from 18% of that cohort to <0.1%) and rolled back instantly if needed.

Keywords

Use of targeted crash analytics to narrow affected devices and scale (~8k users/day)Reproduced in Firebase Test Lab and adjusted JSON parsing defensivelyStaged rollout and monitoring reduced crash rate from 18% to <0.1% for cohort
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