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React Native Debugging ServiceGet help

React Native specialistRemoteFixed-price debugging

React Native debugging service

I diagnose and fix difficult React Native and Expo issues — Android, iOS, native modules, builds, upgrades and CI/CD.

Get help with my bugSee what I fix

Send me the error and I'll tell you whether I can fix it.

./gradlew assembleRelease
> Task :app:mergeReleaseNativeLibs FAILED
  2 files found with path
  'lib/arm64-v8a/libc++_shared.so'

FAILURE: Build failed with an exception.

Bug fixes from $150

The situation

Some React Native bugs are not worth losing two days to.

You know the pattern. The stack trace points nowhere useful. The fix that worked for someone in 2022 does nothing. You start deleting node_modules for the fourth time.

  • It works locally. Release builds fail.

    Debug runs fine. The release build dies in Gradle or in the archive step, with an error that names a file you never touched.

  • Expo prebuild suddenly breaks.

    One dependency bump later, prebuild rewrites your native folders and the app no longer compiles. Now you own a config plugin problem.

  • Gradle and Xcode errors make no sense.

    Duplicate classes, missing symbols, mismatched deployment targets, a Kotlin version conflict three levels deep in a transitive dependency.

  • A native module crashes on one platform only.

    Android is fine, iOS crashes on launch. Or the other way around. The JS is identical, so the cause is under it.

  • An upgrade turns into a dependency chain.

    You bump React Native. Then Reanimated. Then the Gradle plugin. Then something needs a peer version that does not exist yet.

  • Claude or Codex gave you a fix. It didn't help.

    The patch looked reasonable, applied cleanly, and changed nothing. The real cause was somewhere the model never looked.

None of this is a sign that you're a bad developer. These bugs live in the gap between JavaScript and the native build systems, and that gap is where I spend my time.

Scope

What I fix

Most of the work falls into these areas.

  • Android & Gradle

    Build failures, duplicate classes, ProGuard/R8 issues, signing.

  • iOS & Xcode

    Pod install failures, linker errors, archive and signing problems, deployment isssues.

  • Expo

    EAS Build failures, moving between managed and bare.

  • Native Modules

    Modules that only break on one platform, bridging and TurboModule issues.

  • React Native Upgrades

    Version bumps, New Architecture migration, dependency chains

  • Hermes & Reanimated

    Worklet errors, crashes that only appear in release builds.

  • CI/CD

    Pipelines that pass locally and fail in CI, caching problems, Fastlane, GitHub Actions.

  • Production Crashes

    Finding the actual trigger.

Process

How it works

  1. 01

    Send the problem

    Send the error, the logs, the repository or just a description. Whatever you have is enough to start.

  2. 02

    I investigate

    I reproduce the issue, identify the root cause and implement the fix.

  3. 03

    You get an unblocked app

    You receive the fix and an explanation of what caused the problem.

About me

React Native engineer who enjoys solving the hard bugs.

I'm Mykhailo, a React Native engineer with 8 years of experience in IT and 5+ years focused on React Native and mobile engineering.

I've worked on B2C and B2B products in travel, video surveillance and fitness, supporting apps used across 37 countries, and built features that thousands of users rely on every day.

Over the years, I've spent a lot of time solving the problems that are hardest to debug in React Native: iOS and Android crashes, Gradle and Xcode issues, native modules, dependency conflicts, React Native upgrades, CI/CD and production bugs.

I also use tools like Claude Code and Cursor in my workflow. They help me investigate and move faster, but I always verify the result against the real application, native environment and build system.

When a React Native problem is blocking your project, my goal is simple: find the root cause, fix it, and get you moving again.

Mykhailo Chulei, React Native engineer
Mykhailo ChuleiReact Native engineer
LinkedIn(opens in a new tab)
  • 8 years in IT
  • 5+ years React Native
  • iOS + Android
  • B2B and B2C products

Things I've fixed

  • Production bugs

    Critical issues in live apps used by thousands of people — crashes, race conditions and memory leaks, tracked down through Crashlytics, Sentry and Grafana.

  • Native & build issues

    Gradle, CocoaPods, Xcode, the Android SDK and native modules. Where a third-party library fell short, I wrote or patched the native code myself.

  • React Native upgrades

    Version bumps that drag the whole dependency tree with them: conflicting peers, breaking changes, and getting iOS and Android compatible again afterwards.

  • CI/CD & releases

    Automated iOS and Android pipelines on GitLab CI, Jenkins and Bitrise, plus the App Store and Google Play problems that only surface at release.

Teams I've worked with

Omio · NetRex · 12Climb

Have a React Native problem you can't get past?

Get help with my bug

Pricing

Get your project unstuck

From $150/ issue

Simple bugs cost less. Complex native and build issues are quoted before work starts.

Tell me about your bug

If I don't think I can help, I'll say so before you pay anything.

What's included

  • Root-cause investigation

    I find what is actually causing it, not what looks related.

  • Implementation of the fix

    Working code in your project, not a suggestion to try.

  • Verification

    The build runs, or the crash is gone, before I call it done.

  • Clear explanation

    What broke, why it broke, and how to avoid it next time.

More services

Other work I take on

Same engineer, same plain approach. Each project is quoted after a short look at the code.

  • 01

    Vibe-coded app → production ready

    You built an app fast with AI tools like Cursor, Claude Code, Lovable or Bolt. I make it ready for real users.

    • Audit of code and architecture
    • Fix crashes, security gaps and missing error handling
    • Set up builds, CI/CD and store release

    Quoted after a short review

    Get my app reviewed

  • 02

    Performance improvement

    Slow startup, dropped frames, memory leaks, heavy re-renders or a large bundle. I profile, find the cause, fix it and measure before and after.

    • Profiling to find the real cause
    • Fixes for startup, jank, leaks, re-renders and bundle size
    • Before and after measurements

    Quoted after a short review

    Ask about performance

  • 03

    App Store / Play Store rejection handling

    Your build got rejected by Apple App Review or Google Play. I find what the reviewer flagged, fix it in the app or the listing and get it resubmitted.

    • Read the rejection and map it to the exact guideline or policy
    • Fix code, permissions, privacy manifests, data safety forms or metadata
    • Reviewer reply, resubmission or appeal

    Quoted after a short review

    Get my app approved

  • 04

    Third-party SDK integration

    Push notifications, in-app purchases, payments, maps, analytics or deep links. I wire the SDK into both platforms so it works in release builds, not just the demo.

    • Native setup for iOS and Android, including Expo config plugins
    • Push, in-app purchases, Stripe, maps, Firebase, deep links
    • Tested on real devices in release mode

    Quoted after a short review

    Ask about an integration

  • 05

    AI features in your app

    Chat, smart search, summaries, image or voice input. I add LLM-powered features to your React Native app with API keys kept on the server, streaming replies and sane costs.

    • Backend proxy for OpenAI, Claude or Gemini, no keys in the app bundle
    • Streaming UI, retries, rate limits and error states
    • Cost and latency checks before release

    Quoted after a short review

    Ask about AI features

  • 06

    AI development workflow for your team

    Your team uses Cursor or Claude Code but output is hit or miss. I set up an AI flow for feature work, from spec to tested PR, tuned to your codebase.

    • Project rules, agent instructions and reusable skills for your stack
    • Spec-first, test-first loop the AI follows for every feature
    • AI code review in CI and a short hands-on session for the team

    Quoted after a short review

    Set up my AI workflow

Method

Already tried Claude or Codex?

That's fine. I use AI-assisted debugging too. The difference is that I verify the result against the actual project, build system and runtime instead of blindly applying generated fixes.

A generated patch can be correct, plausible but wrong, or correct for a different version of your setup. Telling those apart takes a real build, a real device and someone reading the native output.

FAQ

Questions

What kinds of bugs do you fix?

Build failures, native crashes, Expo and prebuild problems, upgrade breakage, CI/CD failures and production crashes in React Native apps. If it sits between your JavaScript and the native build, it's the right kind of problem.

Do I need to give you access to my repository?

Not always. Many build problems can be solved from the error output, your package.json and the relevant native config files. For harder issues, repository access makes it much faster. A stripped-down reproduction repo also works.

How much does it cost?

From $150 per issue. Small, well-defined bugs sit at the low end. Complex native or build problems are quoted before any work starts, so you always know the price first.

Can I hire you for a contract instead of per issue?

Yes. For ongoing or longer work on your app, I take contract jobs at $40/hour. Tell me about the project and the expected hours, and we'll agree on the scope before starting.

Do you work with Expo?

Yes. Managed workflow, bare workflow, config plugins, prebuild and EAS Build. Moving a project from managed to bare is also a common request.

Can you fix native Android/iOS issues?

Yes. That is most of the work. Gradle and AGP conflicts, Podfile and linker errors, autolinking, signing, ProGuard/R8, and crashes that only reproduce in release builds.

What if you can't reproduce my bug?

I'll tell you. If I can't reproduce it and can't identify the cause from your logs and code, you don't pay for it. Sometimes the outcome is a narrower reproduction and a clear next step instead of a fix.

Contact

Tell me about your bug

Paste the error, describe what you tried, and tell me what changed before it broke. I'll read it and tell you whether I can fix it.

Prefer email? Write to mataleo1212@gmail.com.

What broke, what you already tried, and what changed just before.

Your details are used only to reply to you. No newsletter, no sharing.

Don't spend another day fighting the build.

Get help with my bug

Describe the problem. I'll let you know whether I can help.