Android App Development
BinaryBrill is an Android app development company building Kotlin and Jetpack Compose apps tested against the ageing, OEM-skinned hardware your users actually carry, not just the two flagship phones sitting in the office. Hire Android developers — in-house senior engineers — for native Kotlin app development services and custom Android app development that keeps working under aggressive battery management, not just in a demo.
A senior engineer replies within 24 hours — not a sales rep.
Testing happened on two Pixels and a demo Samsung
Your actual users are on four-year-old mid-range hardware, a manufacturer skin nobody in the office runs, and a screen size the layout was never checked against. The crash reports and one-star reviews arrive from devices no one on the project owns, which is why they took so long to notice.
Background work dies the moment the screen locks
Sync, location tracking and notifications that worked perfectly in testing get silently killed by Samsung's, Xiaomi's or OnePlus's own battery managers within minutes of the app leaving the foreground. Doze mode and OEM-specific restrictions aren't edge cases on Android — they're the default behaviour a build has to survive.
The target SDK deadline arrived and the app couldn't be updated in time
Google raises the minimum target SDK level on a fixed schedule, and an app that hasn't kept pace becomes unlistable on Play, not just outdated. Nobody owns tracking that deadline until it's two weeks away and the codebase needs more than a version bump to comply.
The interface looks like an iOS app wearing a Material icon
A layout designed against Apple's conventions gets shipped to Android with the icons swapped, and the back gesture, navigation drawer and system dialogues never feel native. Android users notice the same way iPhone users notice the reverse, and it reads as an app that wasn't really built for them.
Fragmentation isn't a bug to route around — it's the actual shape of the Android install base, and the build has to be tested against it from the start, not discovered through crash reports after launch.
Real device coverage, not two flagships and a simulator
We test against the mid-range and older hardware, the OEM skins and the screen sizes your analytics say your users are actually on, not the phones that happen to be in a drawer at the office. Bluetooth pairing, camera behaviour and layout all get checked on that real matrix before release, not after.
Background execution built to survive OEM battery management
WorkManager and foreground services configured against Samsung's, Xiaomi's and OnePlus's specific restrictions, with manufacturer exemptions requested where the use case genuinely needs them. A sync feature that only works on stock Android is not finished.
Target SDK and Play policy deadlines on the calendar as hard dates
We track Google's target SDK schedule and Play policy changes the way we track any other release deadline, so a compliance requirement never becomes the reason your app gets pulled from the store. Compose and Kotlin dependencies stay current for the same reason.
Material 3 and Android's own conventions, not a ported layout
Jetpack Compose interfaces built around Material 3 theming, predictive back and the navigation patterns Android users already know — the same design tokens as any iOS sibling app, expressed through Android's own components rather than iOS's.
Pick the piece you need, or bring us the problem and we'll tell you which applies.
End-to-end Android builds — product shaping, Compose interface, backend integration and Play Store release — for a new Android product or a rebuild of one that has outgrown its original codebase.
Where a product already exists and needs its native layer built, extended or migrated — a Java codebase moved to Kotlin, a module added by us while your team owns the rest, or a feature that needs a capability no cross-platform framework exposes cleanly on Android.
Dedicated Kotlin engineers who join your sprints and your code review, sized up or down as the roadmap changes, without you running a separate hiring pipeline for a skillset you need for one platform.
The gap between an Android app that works in the office and one that works in the field is almost always device coverage. We test against the mid-range hardware, OEM skins and screen sizes your analytics say your users actually carry, not the two phones in a drawer.
Getting a build correctly configured for the Play Store — Android App Bundles, staged rollouts, target SDK compliance and Play Billing — handled as part of the release rather than discovered as a rejection.
Chosen to fit the problem — not because it's what we used last time.
Languages & UI
Architecture & data
Platform services
Testing & release
Every stage ends with something in your hands — not a status update.
We use your analytics, or your market's device profile if you don't have any yet, to define the OEM skins, screen sizes and OS versions the build has to survive, rather than guessing from what's in the office.
You get: A device and OS support matrix, a written scope document, and a recommendation on which OEM behaviours need explicit testing.
Jetpack Compose UI architecture, a background execution strategy that accounts for OEM restrictions, and a Room-backed data layer decided against the app's actual complexity rather than ported from a design built for a different platform.
You get: An architecture document, a module plan, and an agreed approach to background execution and offline behaviour.
Signed builds go to Play's internal testing track every sprint, reviewed against real devices rather than only emulators, so a layout or performance problem is caught the week it appears.
You get: Installable builds every sprint, a CI pipeline with signing configured, and code committed to your own repository throughout.
Testing across the agreed device matrix — older mid-range hardware, small screens, low memory — followed by a staged rollout on Play rather than a single release to everyone at once.
You get: Device test results against the agreed matrix, a published Play Store listing, and signing keys transferred into your own developer account.
Technician and driver apps for warehouses and depots running on rugged Android hardware, with barcode scanning and battery draw as real constraints across a long shift.
Rider and driver apps where background location has to keep reporting through Doze mode and OEM battery restrictions on a locked screen.
Shopping apps that live or die on scroll performance and checkout speed on budget handsets, with Play Billing handling subscriptions and in-app purchases.
Apps built for low-end hardware and constrained storage, offline-first by design rather than assuming a fast, always-on connection.
Banking and wallet apps using Android Keystore for biometric authentication and certificate pinning rather than a general-purpose wrapper.
Streaming and audio apps needing background playback and casting through Android's own Cast APIs, tested against the manufacturer skins that most aggressively restrict background work.
If your app is mostly screens, data and workflow, and you need both stores without staffing two native teams, a single codebase in React Native or Flutter is often the cheaper route — we cover that on our Cross-Platform Apps page. Native Android earns its cost when you're leaning on tight background execution, sensor or camera control, or an interface that has to feel indigenous to Android's own conventions rather than a shared design system stretched to fit.
It changes the testing far more than the code. We define the device matrix from your actual analytics or your market's typical hardware, then verify background execution, memory use and layout on that matrix specifically, rather than on whatever's newest in the office. This is usually where Android budgets are under-estimated, not in the build itself.
Screen count matters less than device coverage. The expensive parts are background execution that has to survive OEM battery managers, offline behaviour, payment flows through Play Billing, and testing across the OEM skins your users actually run. After a shaping conversation we can give you a range, and a short paid discovery converts that into a fixed scope and timeline.
Sensitive data is held through Android Keystore rather than shared preferences, permissions are requested only where the feature genuinely needs them, and the Play Console data safety section is filled out to match what the code actually collects. Your data and your users' data stay in your own infrastructure and accounts throughout.
When the app is workflow and content, both stores need to launch together, and nothing in the spec touches the hardware in a way that needs Android-specific APIs. In that case a cross-platform build gets you to both stores for less, and we'll say so rather than sell you two native teams you didn't need — see our Cross-Platform Apps page for that route.
Yes — we start with a review of the codebase, the build setup and the crash data before touching any features. From there we can migrate Java and legacy View-based UI to Kotlin and Compose incrementally, module by module, rather than a stop-the-world rewrite that pauses feature work for months.
Real devices, because emulators don't reproduce OEM battery management, manufacturer skins or the memory pressure of an actual mid-range phone. We test against the matrix agreed in the device audit, using the OEM hardware and screen sizes your users are genuinely on rather than a generic set.
You do, from the first commit: repository, designs, signing keys and the Play Store listing. We publish under your own Google Play Developer account rather than ours, because moving a live app out of an agency account later is genuinely painful and risks your reviews and rankings. If the account doesn't exist yet, we help you set it up before submission.
Our own in-house engineers in Sahibzada Ajit Singh Nagar, Punjab — 45+ of them, with over a decade of combined delivery experience, delivering for clients in 15+ countries. Nothing is subcontracted. You meet the engineers who will be on your project before you sign, and the person demonstrating the work each sprint is the person who built it.
Tell us what the app needs to do and what devices your users actually carry. A senior Android engineer replies within 24 hours with a straight read on scope, timeline and the fragmentation risks worth planning for.
