Hire Mobile Developers

Hire mobile app developers who own the release, not just the code

BinaryBrill is a mobile developer staffing company that lets you hire mobile app developers — hire iOS and Android developers natively, or hire dedicated app developers on React Native and Flutter when a shared codebase is the honest trade-off — from our own in-house team of senior engineers. You run the technical interview yourself, and the person who joins is salaried and in-house, accountable for the release long after the store approval comes through.

A senior engineer replies within 24 hours — not a sales rep.

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Why hiring a mobile developer goes wrong

A bad release can't just be rolled back

Ship a broken build on the web and you revert in minutes. Ship one on mobile and it queues for store review while your users keep the version that crashes on launch, or the forced-update path nobody built kicks in too late. The engineer you hire needs to think about the release path, not just the code.

"Mobile developer" hides native, cross-platform and release-ops as one title

Someone who is genuinely strong in Swift may have never touched a staged rollout or a crash-triage dashboard, and a React Native generalist may not be who you want reaching for platform-specific code when a shared component quietly breaks on one OS. The title alone tells you almost nothing about which of these you're getting.

Interviews test algorithm puzzles instead of store rejections and crash triage

A whiteboard question about a sorting algorithm has nothing to do with reading a crash report from a user on a three-year-old Android device, or knowing why App Review rejected a build for a permissions string that was technically correct but poorly worded. The skills that matter in mobile are rarely the ones a generic technical interview checks.

A freelancer who doesn't own the whole release path leaves you exposed

When the person who wrote the code isn't the person who watches it after ship, a crash spike or a rejected update lands on whoever's left — usually your most senior in-house person, mid-sprint, with no context on a decision made months earlier.

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How we help you hire mobile app developers who own the whole release

We are not a marketplace matching you to whoever's free this week. Every engineer we propose is someone on our own team whose shipped releases — and the crash reports and rejections that followed — we have reviewed ourselves.

The role gets defined by native vs cross-platform, up front

Before we shortlist, we agree with your tech lead whether this role needs native Swift or Kotlin depth, or whether React Native or Flutter is the honest trade-off for your team and timeline. That decision, made properly once, prevents a hire who's strong in the wrong stack.

Vetted on shipped releases, not a tutorial app

Our engineers are assessed on real apps they've taken through store review, staged rollouts and the crash reports that came after — what went wrong, what they changed, what they'd do differently. We tell you where each person is genuinely strong and where they're not.

You interview, you decide, you can say no

Run your own technical interview with your own bar. Pair on a real screen, review their crash-triage process, ask about the store rejection that took longest to resolve. Reject anyone for any reason and we go again.

In-house and salaried, so tenure is the incentive

Our mobile engineers are on our payroll, not a marketplace clock. We carry their development and care whether they stay long enough to own your app's release history, not just its current codebase.

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What this covers

Pick the piece you need, or bring us the problem and we'll tell you which applies.

Hire iOS and Android Developers (Native Swift & Kotlin)

Native Swift and Kotlin engineers for the work a shared codebase can't cleanly reach — deep platform APIs, widgets, background processing limits, and performance that has to hold on real hardware. Hire this specialism when platform-specific behaviour is where your app actually differentiates.

  • Deep platform API work — widgets, notifications, background execution limits, biometrics
  • Performance and memory profiling tuned to each platform's real constraints, not a shared abstraction
  • Comfortable owning one platform to a genuinely senior level rather than two platforms shallowly
  • Interop knowledge for teams running native alongside a cross-platform core

Cross-Platform App Developers — React Native & Flutter

React Native and Flutter engineers for teams where one shared codebase across iOS and Android is the honest trade-off, not a shortcut being sold to you. Hire this specialism when your team and timeline don't support maintaining two native codebases, and you need someone who knows exactly where the abstraction leaks.

  • Shared codebase architecture with native modules written where the abstraction genuinely breaks down
  • Judgement on which features are safe to share and which need a platform-specific branch
  • Upgrade discipline across React Native or Flutter versions without breaking native dependencies
  • Honest advice on when cross-platform stops being the right call for your app

Release Engineering & App Store Operations

Release engineering: store review rejections, staged rollouts, forced-update paths and crash triage after ship. Hire this specialism when releases have started to feel risky, or when the person currently doing this is your most senior engineer instead of a specialist.

  • Staged rollouts and forced-update paths designed before a bad build ships, not during one
  • A working relationship with store review requirements that reduces rejection surprises
  • Crash-triage process that gets from a Crashlytics alert to a root cause without guesswork
  • Release checklists and CI pipelines that make shipping routine rather than eventful

Offline Sync, Background Work & Device Performance

Offline behaviour, background sync and sensible conflict resolution when the device reconnects, plus cold start, memory and battery profiling on real low-end hardware rather than a flagship simulator. Hire this specialism when your users are on patchy connections or older devices your test lab doesn't reflect.

  • Offline-first data models with conflict resolution that doesn't silently drop a user's changes
  • Background sync that respects battery and OS scheduling limits instead of fighting them
  • Cold start, memory and battery profiling on real mid-range and low-end hardware
  • Graceful degradation when connectivity drops mid-action, not just a spinner that never resolves

Mobile Developer Staffing & Screening Advice

Telling an engineer who has actually shipped and supported a live release apart from one who has only built tutorial apps is most of the hiring problem. As a mobile developer staffing company, this is advice we give whether or not you hire through us.

  • A rubric for separating genuine release experience from portfolio apps that were never really live
  • Interview questions that surface how a candidate handled a real crash spike or store rejection
  • Guidance on native versus cross-platform for your specific team and timeline
  • An honest read on whether you need one mobile engineer or one per platform

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The stack we build on

Chosen to fit the problem — not because it's what we used last time.

Native iOS

  • Swift
  • SwiftUI
  • Combine
  • Xcode
  • Core Data

Native Android

  • Kotlin
  • Jetpack Compose
  • Android Studio
  • Room
  • WorkManager

Cross-platform

  • React Native
  • Flutter
  • Expo
  • Firebase

Release & shared tooling

  • Fastlane
  • App Store Connect
  • Google Play Console
  • Crashlytics
  • Sentry

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How we'll work together

Every stage ends with something in your hands — not a status update.

  1. 01

    Turn the vacancy into a mobile skills profile

    A working call with whoever this engineer reports to. We pin down native versus cross-platform, which platforms and OS versions actually matter, the release cadence, and the overlap hours you need.

    You get: A written role profile covering platform, seniority band, ownership and the questions we suggest you ask in interview.

  2. 02

    Screen before we spend your time

    We run the technical assessment ourselves — a code review exercise, a walkthrough of a real release they shipped, and a conversation about a store rejection or a crash spike they actually handled. Only people we'd trust on our own hardest release reach your inbox.

    You get: A short shortlist with real release history and honest written notes on each candidate's strengths and gaps.

  3. 03

    Your interview sets the bar

    Interview as you would a permanent hire. Pair with them on a real screen, review a crash report together, ask about the release that went badly. We stay out of the way apart from scheduling.

    You get: Interview slots inside your working hours, plus a written summary of what was agreed on scope and start date.

  4. 04

    Make the first weeks count

    Access to your App Store and Play Console accounts, the CI pipeline and crash reporting is arranged before day one, with a deliberately small first ticket lined up — a crash fix or a small screen. Merged code ahead of your next release tells you more about fit than another interview round would.

    You get: An onboarding plan agreed with your lead, a named point of contact on our side, and early merged work you can review.

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Where we've applied this

Retail and e-commerce

Storefront and checkout app engineers who treat a slow add-to-cart tap as a lost sale, not a minor bug.

Healthcare

Engineers who build offline-tolerant patient apps and understand why a clinical app can't lose a data entry to a dropped connection.

Logistics and field services

Developers for driver and field-technician apps that have to work properly with no signal for half the shift.

Finance

Engineers who treat a banking app's release discipline — staged rollouts, forced updates — as non-negotiable given what's at stake.

Media and entertainment

Specialists in background playback, download-for-offline and battery behaviour across long sessions.

Education

Developers for learning apps where enrolment peaks and patchy school wifi make offline behaviour a product requirement.

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Questions buyers ask us

How do we decide between native and cross-platform before we even start hiring?

Native makes sense when your app leans on deep platform APIs, needs top-tier performance, or one platform is clearly the priority. Cross-platform makes sense when you need both iOS and Android moving at the same pace and your team or timeline can't support two native codebases. We help you settle that on the role-profile call, before it becomes a hire made in the wrong stack.

One strong hire is usually enough when a single cross-platform codebase covers both platforms, or when one platform genuinely leads. You need one engineer per platform when both need dedicated native depth and have to ship in parallel at pace — asking one generalist to do both at full depth just moves the bottleneck rather than removing it. We'll tell you honestly which situation you're in.

Seniority is the largest factor, then whether the role needs native depth on one or two platforms versus a cross-platform generalist, then how much of your working day needs covering. We put a written role profile together first — platform, seniority band, ownership — so the number you're comparing is specific to the role, not a range off a pricing page, and a shortlist follows once that's agreed.

A marketplace matches you to a freelancer and steps back; the engineer's incentives, tooling and career sit outside the arrangement. Our mobile engineers are in-house and salaried, reviewed internally, and someone here is accountable for their growth and for whether they stay on your work. We are not the lowest number you'll be quoted — we compete on the seniority of the person and on how long they stay once they know your release history.

They join your board, your repository, your branching rules and your release cadence rather than running a parallel plan. Our team works from Punjab, India, which gives a natural afternoon overlap with the UK and Europe; for US clients engineers shift later so your morning is covered. We agree the specific window before anyone starts.

Everything an engineer writes for you is yours, in your repository, from the first commit, and you keep control of your own App Store Connect and Play Console accounts. They sign your NDA, work under your access controls, and can be restricted to company-managed devices or VPN-only access where your policy requires it. If you later want the work handed to an internal hire, we document and hand over rather than making that difficult.

When you need both platforms shipped at full depth and in parallel right now — one generalist stretched across two native stacks will be slower than two focused specialists, and we'll say so rather than placing someone into a role that's really two roles. It's also the wrong fit if the app depends on specialist territory like heavy AR or custom graphics work that sits outside general mobile engineering; that needs a narrower specialist than a standard mobile hire.

Yes, and we'd push back if you didn't want to. We screen first so you're not sifting CVs, then you run whatever process you use for permanent hires — pairing, code review, a walk through a real release, your call. You can reject anyone without justifying it, and nobody joins your team on our say-so alone.

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, and nobody joins your team without you interviewing them first. Once someone is placed, everything they write is committed to your repository from day one, so ownership was never in question.

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Tell us which platforms and what the next release looks like

Send us native or cross-platform, the platforms that matter, and what this person would own through their first release. A senior engineer replies within 24 hours with candidates worth your time — and a straight answer if you actually need one engineer per platform.