When you hire Kotlin developers in India, look first for evidence of Android apps that were shipped and then maintained through several releases, and only then test individual skills: coroutines and Flow, Jetpack Compose, clean architecture and Play Store compliance. Maintenance experience is the strongest predictor of how a developer will treat your codebase a year from now.
If you would rather work with a senior Android team than assemble one yourself, share your app and roadmap with us and we will propose a setup.
Start with evidence: signs of shipped, maintained apps
Anyone can build a demo. Far fewer engineers have kept a production app healthy while Android, Google Play and user expectations changed underneath it. Ask candidates to talk about one app they supported for at least a year, and listen for these signals.
Green flags in a candidate's story
- They mention target SDK upgrades. Google Play requires apps to target a recent API level every year. Someone who has done this can describe the behaviour changes they handled, such as notification permissions or foreground service types.
- They talk about Android vitals. Crash rate, ANR rate, startup time and how they brought a number down.
- They migrated something. XML views to Compose, RxJava to coroutines, Java to Kotlin, or kapt to KSP. Migrations teach judgement.
- They know the release pipeline. Staged rollouts, internal testing tracks, Play App Signing and how they halted a bad release.
- They can name trade-offs they regret. Honest reflection on past architecture choices is a sign of seniority.
Red flags worth probing
- Every project was "built from scratch" and handed over, with no maintenance period.
- Portfolio apps that no longer exist on Google Play, or that have not been updated in years.
- No mention of testing, or testing described only as manual QA by someone else.
- Vague answers about how crashes were found and fixed after release, which suggests they never had access to production monitoring.
The Kotlin and Android competency map
Once the evidence looks right, test the specific skills your app needs. Here is the map we use when we assess Android engineers.
Kotlin language depth
Null safety used properly rather than with the !! operator scattered everywhere, sealed classes for modelling UI state, data classes, extension functions used with restraint, and scope functions that make code clearer instead of cleverer.
Coroutines and Flow
This is where Android bugs hide. Ask the candidate to explain structured concurrency, the difference between viewModelScope and lifecycleScope, when to use StateFlow versus SharedFlow, and how they collect flows safely with lifecycle awareness. Then ask how they would cancel a search request when the user types another character.
Jetpack Compose
Compose is now the standard UI toolkit for new Android work. Look for understanding of state hoisting, recomposition and how to avoid unnecessary recompositions, side-effect APIs such as LaunchedEffect, and interoperability with existing XML screens.
Architecture and the Jetpack stack
- MVVM or MVI with a clear separation between UI, domain and data layers.
- Dependency injection with Hilt or Koin.
- Room for local persistence, DataStore for preferences and WorkManager for reliable background jobs.
- Retrofit or Ktor for networking, with proper error mapping.
Beyond Android: Kotlin Multiplatform
If you plan to share business logic with iOS, ask about Kotlin Multiplatform experience specifically. It is production-ready for shared logic, and Compose Multiplatform now extends to iOS UI, but the practical know-how of structuring shared modules and handling platform expectations is still relatively rare.
Interview questions that separate levels
- "Walk me through what happens when the device rotates during a network request in your architecture."
- "How would you make a list of ten thousand items scroll smoothly in Compose?"
- "A user reports the app is slow to open. How do you investigate?" (Look for baseline profiles, startup tracing and lazy initialisation.)
- "How do you test a ViewModel that depends on a repository returning a Flow?"
- "What changed for your app in the last target SDK upgrade?"
Pair these with a short paid task on a real module of your app. Review the pull request for tests, readability and how the developer responds to your comments.
Structuring the engagement when you hire Kotlin developers in India
India offers strong Android talent because the country is overwhelmingly an Android market, and many engineers have built for low-end devices and unreliable networks. The engagement model is what decides whether that talent works for you.
- Individual hires work when you already have an Android lead to set standards and review code.
- A dedicated team through a partner adds continuity, cover for leave and shared knowledge.
- Project delivery suits companies without in-house mobile expertise that want architecture, QA and releases handled end to end.
iJurug Soft, founded in Bangalore in 2018, builds Android and cross-platform apps as part of our mobile and web development services. Senior engineers lead every engagement, we work to fixed milestones and we stay for long-term support. For broader context, see our guides on hiring Android developers in India and Android app development services.
Frequently asked questions
Is Kotlin experience enough, or do we need Java too?
For new work, Kotlin is the standard. Java reading skills still help with older codebases and some libraries, so ask about both if your app has legacy modules.
Should we rewrite our XML screens in Compose?
Rarely all at once. Most teams write new screens in Compose and migrate old ones when they are changed anyway, which spreads the effort and risk.
How do we protect our code and Play Console access?
Keep the Play Console and signing keys under your company account, grant developers role-based access, and ensure your contract assigns all code ownership to you.
What shapes the budget for Kotlin developers?
Seniority, team size, duration, and whether QA, design and release management are included. We do not publish rates; we quote once we understand your roadmap.
Looking for Kotlin engineers who have maintained real apps, not just built demos? Tell us about your product and timeline through our enquiry form, or write to info@ijurugsoft.com. We will reply with questions, a suggested team structure and a clear quote.