Hire Android developers to build Kotlin apps that work on every device

If you need iOS and Android quickly with one team, React Native or Flutter can be the right choice. Native Android with Kotlin is better when the app depends on deep device features, heavy background work, Bluetooth, Wear OS or the best possible performance on low-end phones. Kotlin Multiplatform is also an option to share business logic with iOS while keeping native UI. We build all of these and will recommend what fits your product.

Cost depends on the number of screens and features, the backend and integrations you need, background work, payments, which devices and form factors you support, your timeline and the size of the team. A simple MVP and a large app with offline sync, billing and a Wear OS companion are very different projects. After a short call we give you a free, fixed quote so you know the full cost before work begins.

A focused MVP usually takes 8 to 14 weeks. You get the first internal test build in 1 to 2 weeks and a new one each sprint. If your app is published on a new personal developer account, Google requires a closed test with at least 12 testers for 14 days before production, so we plan that in. Organization accounts skip that step, which is one reason we usually suggest one for business apps.

We choose a minimum Android version based on your users, use AndroidX libraries that handle version differences and test on a real mix of brands, screen sizes and memory levels. Firebase Test Lab lets us run tests on many more models. We pay special attention to manufacturers known for aggressive battery saving, because they can stop background tasks and notifications that work fine on a Pixel.

The Play Console has internal, closed and open testing tracks plus production. Internal testing is for up to 100 people on your team and builds are available within minutes. Closed testing is for invited testers, such as beta users, and open testing lets anyone join from the store. We use internal testing every sprint, closed testing before launch and staged rollouts in production, so problems reach as few users as possible.

Yes. We read the policy email and Play Console notes, find the exact policy involved and fix the app, the listing or the declarations. Common causes are an inaccurate Data safety form, an SDK collecting data you did not declare, background location without a valid reason, missing account deletion or payment flows that should use Google Play Billing. Then we resubmit or file an appeal with a clear explanation.

Yes, and we do it gradually. Kotlin and Java work in the same project, and Compose screens can sit inside existing XML layouts and the other way round. We start with the parts you change most often, add tests around them and convert step by step. You keep releasing features during the migration, and the risk is far lower than a full rewrite.

Yes. We build adaptive layouts for tablets, foldables and Chromebooks using window size classes, so one app works well on every screen. For watches we build Wear OS apps, tiles and complications with Compose for Wear OS. They can work alone or sync with your phone app through the Wearable Data Layer API. Good large-screen support also helps your app show up for tablet users on Google Play.

You do. The app is published from your own Google Play Console account, and we join it with only the permissions we need. Play App Signing keeps your signing key safe with Google, and the upload key and code live in your repository. You own all code and IP from day one, and we sign an NDA on request.

We offer post-launch support: crash and ANR monitoring, bug fixes, replies to Play reviews and new features. Every year Google raises the target API level that updates must meet, usually with a deadline in late summer. We test on Android betas early and update your target SDK in time, so you never lose the ability to publish updates.