I diagnose and fix difficult React Native and Expo issues — Android, iOS, native modules, builds, upgrades and CI/CD.
Send me the error and I'll tell you whether I can fix it.
React Native Help> 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
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.
Debug runs fine. The release build dies in Gradle or in the archive step, with an error that names a file you never touched.
One dependency bump later, prebuild rewrites your native folders and the app no longer compiles. Now you own a config plugin problem.
Duplicate classes, missing symbols, mismatched deployment targets, a Kotlin version conflict three levels deep in a transitive dependency.
Android is fine, iOS crashes on launch. Or the other way around. The JS is identical, so the cause is under it.
You bump React Native. Then Reanimated. Then the Gradle plugin. Then something needs a peer version that does not exist yet.
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
Most of the work falls into these areas.
Build failures, duplicate classes, ProGuard/R8 issues, signing.
Pod install failures, linker errors, archive and signing problems, deployment issues.
EAS Build failures, moving between managed and bare.
Modules that only break on one platform, bridging and TurboModule issues.
Version bumps, New Architecture migration, dependency chains
Worklet errors, crashes that only appear in release builds.
Pipelines that pass locally and fail in CI, caching problems, Fastlane, GitHub Actions.
Finding the actual trigger.
Process
Send the error, the logs, the repository or just a description. Whatever you have is enough to start.
I reproduce the issue, identify the root cause and implement the fix.
You receive the fix and an explanation of what caused the problem.
About me
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.
Critical issues in live apps used by thousands of people — crashes, race conditions and memory leaks, tracked down through Crashlytics, Sentry and Grafana.
Gradle, CocoaPods, Xcode, the Android SDK and native modules. Where a third-party library fell short, I wrote or patched the native code myself.
Version bumps that drag the whole dependency tree with them: conflicting peers, breaking changes, and getting iOS and Android compatible again afterwards. Check your package.json first with the free React Native upgrade checker.
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 bugPortfolio
Real-world mobile applications across travel, video surveillance, and sports.
Travel & Transportation
A travel booking application helping users compare and book trains, buses, flights, and ferries.
Video Surveillance
A mobile application for remotely monitoring security cameras, viewing live video streams, and accessing recordings.
Sports & Fitness
A mobile application helping climbers discover routes, log their climbs, and track training progress.
I help teams debug complex issues, improve performance, and upgrade existing React Native applications.
Pricing
From $150/ issue
Simple bugs cost less. Complex native and build issues are quoted before work starts.
Tell me about your bugIf I don't think I can help, I'll say so before you pay anything.
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
Same engineer, same plain approach. Each project is quoted after a short look at the code.
01
You built an app fast with AI tools like Cursor, Claude Code, Lovable or Bolt. I make it ready for real users.
Quoted after a short review
Get my app reviewed02
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.
Quoted after a short review
Ask about performance03
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.
Quoted after a short review
Get my app approved04
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.
Quoted after a short review
Ask about an integration05
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.
Quoted after a short review
Ask about AI features06
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.
Quoted after a short review
Set up my AI workflowFAQ
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.
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.
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.
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.
Yes. Managed workflow, bare workflow, config plugins, prebuild and EAS Build. Moving a project from managed to bare is also a common request.
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.
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
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.
Describe the problem. I'll let you know whether I can help.