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gammaLabz
Get a realistic app scope

Mobile app development

Launch a production-ready iOS and Android app.

gammaLabz designs, builds and ships mobile products with React Native and Expo — including backend, authentication, payments, testing and store release. Work directly with the engineers building it.

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

  • Live on App Store and Google Play
  • Payments and subscriptions shipped
  • Backend, testing and release included
  • Direct access to the engineers

Production apps

Apps already in production

Screenshot of MyEsim GR on iPhone
MyEsim GR icon
MyEsim GR
Mobile app
Browse eSIM plans for Greece, pay in-app with Apple Pay or Google Pay, and manage your connection from 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 — with optional subscriptions on iPhone and Android.
React NativeFastAPIOpenAISupabaseRevenueCat
Download on theApp StoreGet it onGoogle Play

What we deliver

From scope to store release

Product scope and MVP definition
Agree on the core user flow, business model, and the smallest version worth launching before writing production code.
React Native / Expo application development
One codebase for iPhone and Android with native-feeling navigation, forms, and device integrations.
Backend, APIs, authentication and data
FastAPI, Supabase, or Firebase backends wired to your app with secure sign-in and reliable data flows.
Payments, subscriptions and wallet flows
Stripe, RevenueCat, Apple Pay, and Google Pay integrated and tested on real devices.
Testing, CI and production hardening
Automated checks on critical paths, release builds, and the guardrails needed to ship with confidence.
Store submission, launch and ongoing development
App Store and Google Play submission support, launch monitoring, and continued feature work after release.

Is this the right fit?

Strong fit
  • You need a real mobile product on iOS and Android, not a prototype demo
  • Payments, subscriptions, authentication, or backend integrations are part of the scope
  • You want one team handling app, backend, testing, and store release
  • You can collaborate on product decisions and respond within a few business days
  • An existing app needs finishing, stabilizing, or moving to production quality
Probably not the right fit
  • You only need a brochure website or landing page
  • You are shopping purely on the lowest quoted price
  • You need a large agency roster and account-manager layers
  • The scope is undefined and you are not ready for a short discovery conversation
  • You need a native-only Swift and Kotlin rewrite with no shared codebase

How we ship mobile apps

01
Understand the product
Clarify users, core flows, integrations, and what success looks like for the first release.
02
Define the first release
Lock the MVP scope, technical approach, and delivery plan before build work starts.
03
Build and test
Develop the mobile app, backend, payments, and automated tests with direct engineer access throughout.
04
Launch and improve
Submit to the stores, monitor production, and keep shipping improvements after launch.
What happens after you reach out
After a short call, we will tell you whether the project needs a paid discovery, a focused sprint or a full build.

Client words

What teams say after shipping

“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

Get a realistic app scope

Tell us what you are building. We will reply within one business day with sensible next steps — usually a short call, not a generic sales deck.

Prefer email? contactus@gammalabz.com