Mobile Apps
Android App Development Company
RedZen is an Android app development company that builds native Kotlin apps engineered for the real spread of Android devices — screen sizes, OS versions and manufacturer differences — and ships them to Google Play. Cost and delivery date are agreed before work begins.
Native Kotlin
Modern Android tooling for performance and long-term maintainability.
Real-device tested
Built for the fragmentation of actual Android hardware, not one flagship.
Fixed price
Cost and delivery date agreed before we start — never hourly.
Why Android apps break in the real world
An app that looks right on the latest flagship and falls apart on a mid-range phone.
Layouts that break across the enormous range of Android screen sizes and densities.
Behaviour that differs between OS versions and manufacturer skins no one tested.
A Google Play release held up by console setup, policy or staged-rollout mistakes.
We engineer for Android fragmentation from the start — native Kotlin, a realistic device and OS test matrix, and a clean Play Store release — so the app holds up on the phones your users actually carry.
What you get
Native Kotlin
Built with modern Android tooling for performance and long-term maintainability.
Device coverage
Tested across a realistic spread of screen sizes and OS versions, not just one phone.
Backends & APIs
We build or integrate the server side the app relies on.
Offline support
Local storage and sync so the app degrades gracefully on poor connections.
Device features
Notifications, location, camera, billing and background work where they matter.
Store-shipping track record
We regularly take apps through mobile store review — the process discipline that gets a release approved cleanly, applied to Google Play.
- A native Android app built in Kotlin
- The backend or API integration it needs
- Test-track builds for review
- Source code and the Play Store release
How we work
Define
Agree the first release scope and the devices we are targeting.
Build
Iterative development with installable builds you can try.
Test
Internal and closed-track testing on real devices.
Ship
Release to Google Play with the listing prepared.
Building for Android device fragmentation
The hard part of Android is not writing the app — it is that "Android" means thousands of device, screen-size, OS-version and manufacturer combinations, any of which can break a layout or a feature. We treat that as a first-class engineering problem: responsive layouts, a realistic test matrix of real devices and OS versions, and graceful handling of the hardware and permission differences between them.
That is the difference between an app that demos well on one phone and one that holds up on the range of devices your users actually carry.
Hire Android developers
If you need to hire Android developers rather than build and manage a team, RedZen is the alternative: senior Kotlin engineers plus the backend, design and Play Store launch on one fixed-price agreement.
You get native Android depth without the hiring and bench cost — and the code and Play Store listing are yours to keep.
Common questions
What does an Android app cost?
It depends on scope, so we give a fixed price after a short scoping conversation — the cost and delivery date are agreed before any work begins, and we never bill hourly.
How long does an Android app take?
A focused first version is far faster than a full build. We give a firm timeline once the scope is agreed.
Do you handle Google Play submission?
Yes — console setup, signed builds, the store listing, policy compliance and staged rollout. We manage the release, not just the build.
Kotlin or cross-platform?
For demanding Android apps we recommend native Kotlin. If you need iOS and Android on a tighter budget, cross-platform can make sense — we talk through the trade-offs honestly rather than defaulting.
Which devices and OS versions do you support?
We agree a target matrix up front based on your users, and test across a realistic spread of screen sizes, densities and Android versions — not just the latest phone.
Do I own the code?
Yes. The source code and the Play Store listing are yours, with no lock-in to us.
Can you fix an app that runs poorly on some phones?
Yes. Device-specific issues are exactly what proper testing and profiling address.
Do you handle design?
Yes — Android app design is available as part of the build, or we work from designs you already have.
Android App Development Company
Tell us what you need and we will come back within one business day with a clear, honest next step — no obligation.