hardScenarioDesignSeniorStaff
How do you architect and implement Dynamic Feature Modules in an Android application to reduce initial download size and deliver features on demand?
Evaluate the candidate's ability to reduce Android app size and optimise delivery using Dynamic Feature Modules, the Play Core Library, and reversed dependency injection structures. Use this MOBILE answer to show the decision, trade-off, and evidence rather than a memorised definition.
3 min readUpdated 2026-08-15
Answer
Short answer
Dynamic Feature Modules reduce initial Android download size by moving heavy, low-frequency features out of the base app and delivering them on demand. The trade-off is runtime install state, offline failure handling, navigation, dependency injection, and App Bundle testing complexity.
Was this answer helpful?
Likely follow-ups
- How do you decide which features are worth the added complexity of extraction into a dynamic module versus keeping them in the base APK?
- What happens to the user experience if a user requests a dynamic feature while completely offline?
- How would you migrate an existing single-module app to this architecture without shipping a broken build to production?
Related questions
- How do you leverage WorkManager to guarantee execution, handle conflict resolution, and optimise battery usage in an offline-first Android application requiring bidirectional synchronisation?hardAlso on mobile and android3 min
- How do you design the dependency graph, handle shared resources, and optimise build times when breaking down a massive iOS monolithic application into a modular architecture using Tuist?hardAlso on mobile and architecture3 min
- How do you resolve severe performance bottlenecks in a complex React Native application caused by heavy bridge traffic, and how do you evaluate a migration to the JavaScript Interface (JSI)?hardAlso on mobile and architecture3 min
- What does structured concurrency actually give you in Kotlin coroutines, and how does a coroutine scope leak happen despite it?mediumAlso on kotlin and android4 min