IntermediateBehavioral (STAR)
Describe a situation where you had to convince the team to adopt Kotlin Coroutines over RxJava. How did you handle migration and what improvements did you measure?
Android Developer
General

Sample Answer

Situation: Team relied heavily on RxJava2, with complex disposables and memory leaks. Task: Evaluate and migrate to Kotlin Coroutines to simplify async code. Action: I piloted Coroutines in a small feature, demonstrating structured concurrency with CoroutineScope and SupervisorJob, and replaced Observable chains with suspend functions and Flow for streams. Created migration guides, automated lint checks to avoid mixing paradigms, and offered two training sessions. For interoperability, I used kotlinx-coroutines-rx2 adapters where incremental migration was necessary. During migration, we added unit tests for suspend functions and used CoroutineTestRule for deterministic testing. Result: Code readability increased, average function complexity decreased by 27%, memory leaks related to disposables dropped by 90%, and average bug turnaround time for async issues improved by 40%. The team completed migration over three sprints with minimal regressions.

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