G99 Labs builds React Native apps for the App Store and Google Play, Next.js platforms and FastAPI backends for startups and agencies, from first commit to production.
we ship →
// 02 services
One team from the first screen to the last API call, so nothing gets lost between frontend and backend.
React Native and Expo, from architecture to the store listing. Subscriptions and in-app purchases done properly, releases automated with EAS and OTA updates.
Dashboards, marketplaces and enterprise interfaces that stay fast as the product grows.
Next.js · React · Vite · TypeScript
APIs, auth, payments and real-time data, with monitoring in place before launch day.
@app.post("/subscriptions/verify")async def verify(receipt: Receipt):sub = await stores.validate(receipt)return {"active": sub.active}FastAPI · Node.js · PostgreSQL · Sentry
Stuck in App Store review? Purchases not acknowledged? Billing race conditions? We step into existing codebases and fix what blocks the release.
// 03 process
A call, then a written scope with features, timeline and price. No surprises later.
Working builds on your phone early, through TestFlight and internal testing, so feedback lands while it is cheap.
Store submission and review handled end to end, with crash monitoring live from day one.
A monthly hours plan for updates, OS releases and new features after launch.
// 04 contact
Tell us what you are building. You get a reply within a working day with next steps.