A small independent development team — not an agency. We build production-grade software (mobile apps, APIs, and integrations) with a focus on clarity, rigor, and maintainable delivery.

What services does gammaLabz offer?

Cross-platform mobile apps, backend APIs (FastAPI, Firebase, Supabase), in-app payments and subscriptions (Stripe, RevenueCat), AI and search backends (LangChain), and automated testing and CI — so you can ship without guessing whether things still work.

A small independent team — not an agency. You work directly with the people building your product, without account managers or hand-offs. We cover mobile, backend, and product engineering in one place.

What technologies do you work with?

Expo, React Native, Next.js, TypeScript, Firebase, Supabase, FastAPI, Python, PostgreSQL, Stripe, RevenueCat, LangChain, Docker, and GitHub Actions — chosen when reliability, speed, and long-term maintainability all matter.

How do I hire gammaLabz?

Email hello@gammalabz.com with 2–3 lines about what you are building, who it is for, and your timeline. We take on a small number of projects and reply when there is a clear fit.

How do you price projects?

It depends on scope. After a short intro we usually propose fixed-scope milestones for well-defined work, or time-and-materials when discovery is still open. We outline options clearly before anything starts — no surprise invoices.

How long do engagements typically run?

Focused builds often run from a few weeks for a scoped MVP slice to a few months for a full mobile app with backend and store release. Audits and CI work can be shorter. We agree on timeline and checkpoints upfront.

Do you sign NDAs and keep client work confidential?

Yes. We treat client code, data, and product details as confidential. We are happy to sign an NDA before deeper technical discussions. Public case notes on this site only describe work we are permitted to reference.

What timezone do you work in?

We are remote-first and work across EU timezones (EET/EET+1 for Greece, with overlap into Western European business hours). Day-to-day collaboration happens online — async updates plus scheduled calls when useful.

Where is gammaLabz based?

Remote-first, working across EU timezones. Collaboration happens online; we do not maintain a public office address.

Available for select projects

Software built with precisionprecision and shipped with care.

A small independent team building mobile apps, backends, and integrations — from eSIM products where users pay in-app to AI services that process content for your users.

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What we do

Studio,work,stack&process

A small independent development team — not an agency. We work directly with you on a focused set of projects at a time.

Small team, deep focus

Mobile & product

Expo, React Native, product engineering

Native-feeling apps with offline support, in-app payments, and release workflows — from prototype to App Store and Google Play.

ExpoReact NativeProduct engineering

Backend & platform

APIs, data, and release infrastructure

FastAPI and Firebase/Supabase backends, Stripe and RevenueCat integrations, automated testing, and CI — so shipping stays predictable.

FastAPIFirebaseCI/CD

Mobile Applications

Apps that feel native on iPhone and Android — with offline support and smooth interactions — built with Expo and React Native.

ExpoReact NativeTypeScript

eSIM & Payments

Connectivity products where users can buy plans and pay in-app — Firebase/Supabase backends, Stripe billing, and RevenueCat subscriptions wired end to end.

FirebaseStripeRevenueCat

AI & RAG Backends

Server-side intelligence — content analysis, LangChain pipelines, and search over your data — so your app can answer questions or process content reliably.

FastAPILangChainPython

Testing & CI

Automated tests and release pipelines that catch problems before users do — so shipping stays predictable instead of stressful.

PytestDetoxGitHub Actions

Expo

React Native

Next.js

TypeScript

Firebase

Supabase

FastAPI

Python

PostgreSQL

Stripe

RevenueCat

LangChain

Docker

GitHub Actions

Expo

React Native

Next.js

TypeScript

Firebase

Supabase

FastAPI

Python

PostgreSQL

Stripe

RevenueCat

LangChain

Docker

GitHub Actions

Tools we reach for when reliability, speed, and long-term maintainability all need to coexist — from mobile frameworks to payment providers and CI.

ExpoReact NativeNext.jsTypeScriptFirebaseSupabaseFastAPIPythonPostgreSQLStripeRevenueCatLangChainDockerGitHub Actions

Audit

Map requirements, constraints, and risks before writing code — so everyone agrees on scope and what success looks like.

Build

Ship in focused iterations with clean interfaces and typed contracts — so the codebase stays understandable as it grows.

Test

Cover critical paths with automated tests in CI — so changes are checked before they reach users.

Ship

Deploy, monitor, and document — so you can maintain and extend the product after launch.

Case notes

Selected builds

Real projects we have worked on — each described as a problem we faced, what we built, and where things stand today.

eSIM mobile app

Problem

A product needed a mobile app where users could browse eSIM plans, pay in-app, and manage connectivity — not a clunky web-only flow.

Built

Cross-platform app with Expo/React Native, Firebase for accounts and data, and Stripe checkout — so users can sign up, pay safely inside the app, and manage their plan from their phone. Store submission and release workflows were set up alongside GitHub Actions tests.

Status

Shipped through App Store and Play Store release paths. Automated tests run in CI before deploys.

ExpoReact NativeFirebaseStripeGitHub Actions

See MyEsim GR live

AI detection backend

Problem

Client apps needed to send photos or media for analysis and get structured results back — without each team rebuilding upload and provider logic from scratch.

Built

FastAPI service for media intake, provider integrations, and a social sharing flow — so mobile apps can send content and receive usable results through one API instead of wiring providers themselves.

Status

Running in production. Client apps integrate through the API without reworking their own media handling.

FastAPIPythonMedia handlingProvider APIs

Production testing & CI

Problem

An existing codebase had outpaced its test coverage. Billing changes felt risky and releases still depended heavily on manual checks.

Built

Expanded unit and integration tests, GitHub Actions pipelines, and checks around payment-critical paths — so every change runs through automated gates before it can ship.

Status

The team can release with repeatable CI checks instead of relying on manual smoke tests alone.

GitHub ActionsUnit testsIntegration testsStripe

Shipped products

Live on stores and in production

Mobile apps on the App Store and Google Play, plus web products in production — each with the backends, payments, and release workflows clients expect.

MyEsim GR

Mobile app

Shipped eSIM commerce on iOS & Android: Expo app with Stripe checkout (Apple/Google Pay), Firebase backend, and CI-tested purchase & top-up fulfillment.

ExpoReact Native FirebaseStripeApple Pay & Google PayGitHub Actions CIApp Store & Google Play

eSIM mobile app case note

Download on theApp Store

Get it onGoogle Play

Guinea Pig Translator

Mobile app

Full-stack mobile product: Expo app + FastAPI backend with in-app audio capture, OpenAI interpretation, Supabase auth/data, and RevenueCat subscriptions—live on iOS and Android.

React NativeFastAPIOpenAISupabaseRevenueCatApp Store & Google Play

Download on theApp Store

Get it onGoogle Play

aeo — AI Visibility Growth System

When AI picks a winner, make it you. Grow your AI visibility with measurable results.

tryaeo.com

TryAEO

Web app

Production AI-visibility SaaS: Next.js with Supabase auth/data, async free-report pipeline (Apify crawl → LangChain eval), Inngest workers, and Resend email verify.

Next.jsSupabaseLangChainInngestApifyFastAPI

Visit site

Client words

What teams say after shipping

Direct feedback from projects like the ones in our case notes — placeholder copy for layout preview; swap in approved quotes when ready.

Placeholder

“They took us from a web-only flow to a real App Store product — Stripe, Firebase, and CI included. Releases stopped feeling like a gamble.”

Placeholder

“We needed one API for media analysis instead of three half-finished integrations. Clear contracts, structured outputs, and it has been stable in production.”

Placeholder

“Billing changes used to terrify us. They expanded test coverage and CI gates around Stripe paths — we ship with confidence now.”

“They took us from a web-only flow to a real App Store product — Stripe, Firebase, and CI included. Releases stopped feeling like a gamble.”

“We needed one API for media analysis instead of three half-finished integrations. Clear contracts, structured outputs, and it has been stable in production.”

“Billing changes used to terrify us. They expanded test coverage and CI gates around Stripe paths — we ship with confidence now.”

“They took us from a web-only flow to a real App Store product — Stripe, Firebase, and CI included. Releases stopped feeling like a gamble.”

“We needed one API for media analysis instead of three half-finished integrations. Clear contracts, structured outputs, and it has been stable in production.”

“Billing changes used to terrify us. They expanded test coverage and CI gates around Stripe paths — we ship with confidence now.”

How we think

Codethatreadslikeintent,notaccident.

We favor explicit types, small modules, and pipelines you can trace from the app screen to the database — so behavior is intentional, not accidental. The terminal below is a quick sketch of that mindset.

✓ Mapped Firebase + Stripe integration points
✓ Identified 3 critical user flows for E2E coverage
→ Tests passed · CI green · Deployed
Ready._

FAQ

Common questions

Direct answers about who we are, what we build, and how to get in touch.

Before you write

This is enough to start.

You do not need a spec deck or a full brief. A short note like the one on the right is enough for us to tell you if there is a fit.

New message

ExampleSend

hello@gammalabz.com

Subject

MVP for field teams — Q3 timeline

Body

Building a mobile app for technicians who need offline access in the field.Need app screens, backend, and in-app subscriptions.I can decide on scope — hoping to ship a first version in Q3.

Fit check

Good fit / Not a fit

A quick read on when we tend to help, and when we probably will not.

Good fit

Not a fit

Tell us what you're building

You do not need a technical spec. Share the idea, who it is for, and your timeline — we will reply with next steps.

Book a 20-min intro call

2–3 lines is enough to get started.

Software built with precisionprecision and shipped with care.

Studio,work,stack&process

Small team, deep focus

Selected builds

Live on stores and in production

What teams say after shipping

Codethatreadslikeintent,notaccident.

Common questions

What is gammaLabz?

What services does gammaLabz offer?

Who is on the team?

What technologies do you work with?

How do I hire gammaLabz?

How do you price projects?

How long do engagements typically run?

Do you sign NDAs and keep client work confidential?

What timezone do you work in?

Where is gammaLabz based?

This is enough to start.

Good fit / Not a fit

Good fit

Not a fit

Tell us what you're building