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Lyft completed a 7-year migration of its Android codebase from Java to Kotlin across Rider, Driver, and Urban Solutions apps.
•Migration was tracked using an internal tool called Migration Tracker, with a daily cron job updating progress graphs and deadlines
•As of Feb 2025, 85% was complete with ~1,000 files remaining across 20+ teams and 150+ Bazel modules
•A custom Migration Script using Android Studio IDE Scripting automated per-module conversion, created git commits, and notified owning teams
•Key challenges included imperfect auto-conversion generating excessive nullable types, verbose explicit typing, and inability to use Kotlin idioms like map/filter or lateinit var
•A Lint check was added to CI to enforce Kotlin-only code going forward
This summary was automatically generated by AI based on the original article and may not be fully accurate.
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