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gammaLabz
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Mobile app development for UK businesses

Build and launch your iOS and Android app.

Work directly with a senior, EU-based engineering team that overlaps UK working hours. We scope, build and release React Native products — including backend, payments, testing and app-store submission.

Remote EU team · UK-hours overlap · direct engineer access · no account-manager layer

Screenshot of MyEsim GR on iPhone

MyEsim GR

Screenshot of Guinea Pig Translator on iPhone

Guinea Pig Translator

  • Two mobile products live on both app stores
  • Apple Pay, Google Pay and subscriptions shipped
  • Mobile app, backend, CI and release handled together
  • Direct access to the engineers doing the work

Production evidence

Mobile products already live and taking payments

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 this solves

One accountable team from product decision to release

A focused first release
Turn a broad product idea into a buildable MVP with clear user flows, integrations and release priorities.
iOS and Android without two separate teams
Use React Native and Expo to share the product code while preserving native store delivery and device integrations.
Payments and backend included
Keep authentication, APIs, subscriptions and wallet payments within the same delivery plan as the app.
A release you can operate
Ship with automated checks, store submission support, handover and a practical route for improvements after launch.

Delivery scope

What the engagement can include

MVP scope and technical plan
Core journeys, release priorities, architecture and a delivery plan agreed before production build work.
React Native and Expo development
One production codebase for iPhone and Android with native-feeling navigation and integrations.
Backend, authentication and APIs
Secure sign-in, data flows, admin requirements and third-party services connected to the app.
Payments and subscriptions
Stripe, RevenueCat, Apple Pay or Google Pay integrated and tested where the product requires them.
Testing and production hardening
Critical-flow checks, CI, release builds and practical safeguards for a stable launch.
App Store and Google Play release
Submission support, launch monitoring, source-code ownership and continued development if needed.

Is this the right fit?

A strong fit
  • You are a UK startup or business building a real iOS and Android product
  • Your app needs payments, subscriptions, authentication or backend integrations
  • You want direct access to senior engineers rather than an account-management layer
  • You can make product decisions and collaborate remotely during UK working hours
Probably not the right fit
  • You only need a clickable prototype or brochure site
  • Your only selection criterion is the lowest quote
  • You require an on-site UK agency team
  • You need separate native Swift and Kotlin teams

How an engagement starts

01
Initial project call
Discuss users, commercial goal, must-have flows, constraints and the decision timeline.
02
Scope the first release
Define the smallest credible release, technical approach and whether discovery is needed first.
03
Build and test
Develop the app, backend and integrations with working software reviewed throughout delivery.
04
Release and improve
Submit to both stores, monitor launch and continue with measured product improvements.
A clear next step, not an instant fixed quote
After the project call, we will tell you whether there is a fit and recommend a focused discovery, a defined sprint or a full build. Any estimate follows the agreed first-release scope.

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

Request a mobile app project call

Share the essentials. We will reply within one business day to confirm whether the project looks like a fit and suggest the next conversation.

Prefer email? support@gammalabz.com