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gammaLabz
Discuss your React Native app

React Native & Expo

Ship React Native that survives production.

gammaLabz builds and rescues React Native and Expo apps for teams that care about upgrade paths, native module boundaries, and release confidence — not just screen counts. You talk to the engineers doing the work.

EU timezone · direct engineer access · paid discovery or defined build when the scope is clear

Screenshot of MyEsim GR on iPhone

MyEsim GR

Screenshot of Guinea Pig Translator on iPhone

Guinea Pig Translator

  • Expo and bare React Native
  • Native modules when required
  • CI, testing and store releases
  • Upgrade and rescue experience

Shipped with RN

React Native apps in production

Screenshot of MyEsim GR on iPhone
MyEsim GR icon
MyEsim GR
Mobile app
Buy travel eSIMs for destinations worldwide, pay in-app with Apple Pay or Google Pay, and install data plans straight to your phone.
ExpoReact Native FirebaseStripeApple Pay & Google PayGitHub Actions CI
Download on theApp StoreGet it onGoogle Play
Screenshot of Guinea Pig Translator on iPhone
Guinea Pig Translator icon
Guinea Pig Translator
Mobile app
Record guinea pig sounds and get playful AI translations of what they might be saying — on iPhone and Android.
React NativeFastAPIOpenAISupabaseRevenueCat
Download on theApp StoreGet it onGoogle Play

Common failure modes

Where React Native projects usually go wrong

Expo vs native modules chosen too late
Teams pick Expo for speed, then hit a SDK that needs custom native code without a plan for config plugins or a bare workflow migration.
Dependency drift blocks upgrades
React Native, Expo SDK, and third-party packages fall behind until a security patch or store requirement forces a risky big-bang upgrade.
No automated testing on device flows
Payments, push notifications, and deep links are tested manually once, then break silently on the next release.
Backend assumptions baked into UI
Screens call APIs directly, auth tokens leak into components, and every new feature becomes harder to test and refactor.
Store release treated as an afterthought
Builds work in development but fail review, crash on launch, or miss entitlement configuration for payments and background modes.

Technical delivery

What we handle in RN/Expo projects

Architecture and module boundaries
Clear separation between UI, domain logic, and API layers so the codebase stays navigable as features grow.
Expo config plugins and native modules
Honest guidance on when Expo managed workflow is enough and when you need custom native code or a bare workflow.
SDK and dependency upgrades
Planned upgrades across React Native, Expo, and critical libraries with regression checks before release.
Automated testing and CI
Unit and integration coverage on critical paths, plus build pipelines that produce store-ready artifacts.
Performance and release hardening
Startup time, list rendering, error boundaries, and production logging so issues are visible after launch.
App Store and Google Play delivery
Signing, entitlements, store metadata support, and submission through approval.

Is this the right fit?

Strong fit
  • You are starting a new React Native or Expo product and want the stack chosen deliberately
  • An existing RN app needs upgrades, stabilization, or finishing
  • You need native modules, payments, or device features integrated correctly
  • You want engineers who have shipped RN apps to the stores, not generalist freelancers
  • You can share repo access and collaborate on technical trade-offs
Probably not the right fit
  • You need a marketing website only
  • You want a fixed quote before anyone has seen the codebase or requirements
  • You require a separate Swift and Kotlin team with no shared codebase
  • You are looking for staff augmentation without product or architecture input

How we work on React Native

01
Review stack and constraints
Expo vs bare workflow, native module needs, target SDK versions, and what is blocking release today.
02
Agree on technical plan
Upgrade path, architecture adjustments, test strategy, and the first milestone worth shipping.
03
Implement with regression checks
Feature work, native integrations, and CI that catches breakages before they reach testers.
04
Release and maintain
Store submission, monitoring, and ongoing SDK hygiene so the app does not stall again.
Next step
After a short call, we will tell you whether the project needs a paid discovery, a focused sprint or a full build.

Client words

Whatteamssayaftershipping

“gammaLabz are responsive and I've never waited more than 24 hours for a reply. Fair pricing for what you get, and they've upgraded MyEsim GR enormously since I started working with them.”

Dimitris D.

Founder · MyEsim GR

“I started with nothing — no app, no store listing. About a month later the app was live on iPhone and Android, taking payments, and people were actually using it. I didn't think that was possible on my timeline.”

John R.

Founder · Guinea Pig Translator

“gammaLabz are responsive and I've never waited more than 24 hours for a reply. Fair pricing for what you get, and they've upgraded MyEsim GR enormously since I started working with them.”

“I started with nothing — no app, no store listing. About a month later the app was live on iPhone and Android, taking payments, and people were actually using it. I didn't think that was possible on my timeline.”

“gammaLabz are responsive and I've never waited more than 24 hours for a reply. Fair pricing for what you get, and they've upgraded MyEsim GR enormously since I started working with them.”

“I started with nothing — no app, no store listing. About a month later the app was live on iPhone and Android, taking payments, and people were actually using it. I didn't think that was possible on my timeline.”

FAQ

Common questions

Discuss your React Native app

Share where the project stands — greenfield, upgrade, or rescue — and what is blocking production. We respond within one business day.

Prefer email? contactus@gammalabz.com