We build reliable web and mobile products, backend APIs, integrations, payments and subscriptions, AI and search systems—plus the testing, infrastructure, and release workflows that keep them running smoothly.

Can you help with an existing app or codebase?

Yes. We can audit an existing product, stabilise payment or backend flows, improve test coverage and CI, or take on a focused feature without forcing a rewrite.

Who will I work with?

You work directly with the people building the product. We are a small independent team, not an agency, so there are no account-manager hand-offs between the brief and the implementation.

What kinds of projects are not a fit?

We are unlikely to be the right match for cheap clone apps with unclear ownership; projects with no decision-maker who can say yes, no, and what matters; requests to bypass App Store, Play Store, or payment provider policies; or work with no communication or feedback loop. We would rather say so upfront than waste your time.

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 engagements can run from a few weeks for a scoped MVP, audit, or CI improvement to several months for a full product build. Larger, evolving products can continue in phases over a longer-term partnership. We agree on a realistic timeline, milestones, 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.

Are you remote, and what timezone do you work in?

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

gammaLabz — Independent Development Team

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.

Shipped products

Live on stores and in production

Mobile apps on the App Store and Google Play, plus web products in production — a quick look at what each one does.

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 CIApp Store & Google Play

Download on theApp Store

Get it onGoogle Play

Guinea Pig Translator

Mobile app

Record guinea pig sounds and get playful AI translations — with optional subscriptions on iPhone 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

AI visibility SaaS that crawls your site, scores how well you show up in AI search, and delivers a free report by email.

Next.jsSupabaseLangChainInngestApifyFastAPI

Visit site

Other builds

Backend and platform work

Selected projects without a public product page — APIs, AI systems, and reliability work published with client permission.

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

Support AI RAG

Problem

Support teams needed an assistant that could answer from their own documentation instead of returning generic AI responses or sending users through long knowledge-base searches.

Built

A retrieval-augmented support assistant with LangChain, Pinecone, OpenAI, and a React interface. It searches the knowledge base first, keeps conversational context, and falls back gracefully when the available documents do not support an answer.

Status

Built as a reusable support-assistant foundation with retrieval thresholds that keep answers grounded in the available documentation.

LangChainPineconeOpenAIFlaskReact

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

Client words

What teams say after shipping

Direct feedback from projects like the ones in our case notes. Quotes reflect the project at the time of delivery and are published with client permission.

“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.”

“We had the vision for tryaeo.com but not the bandwidth to build it right. They turned it into a real product our customers rely on — not something we have to babysit every week.”

“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.”

“We had the vision for tryaeo.com but not the bandwidth to build it right. They turned it into a real product our customers rely on — not something we have to babysit every week.”

“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.”

“We had the vision for tryaeo.com but not the bandwidth to build it right. They turned it into a real product our customers rely on — not something we have to babysit every week.”

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

contactus@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.

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.

2–3 lines is enough to get started. We usually reply within 1–2 business days.

Software built with precisionprecision and shipped with care.

Studio,work,stack&process

Small team, deep focus

Live on stores and in production

Backend and platform work

What teams say after shipping

Codethatreadslikeintent,notaccident.

Common questions

What do you build?

Can you help with an existing app or codebase?

Who will I work with?

What kinds of projects are not a fit?

How do you price projects?

How long do engagements typically run?

Do you sign NDAs and keep client work confidential?

Are you remote, and what timezone do you work in?

This is enough to start.

Tell us what you're building