Mobile app development for iOS and Android
One codebase, both stores. We build cross-platform apps in React Native — from a service booking app to a crypto wallet — with the backend, deployment and store submission handled end to end.
- 6-12 weeks
- iOS & Android, one codebase
- Idea to App Store
What we build
Cross-platform apps
React Native and Expo — iOS and Android from one codebase, without paying to build and maintain each twice.
Backend & API
The app is half the product; we build the NestJS backend, database and API that stand behind it.
Auth & payments
Sign-in, subscriptions, in-app purchases and payment providers wired in and tested on real devices.
Native capabilities
Push notifications, camera, geolocation, biometrics and secure storage — the platform features users expect.
Offline & sync
Apps that keep working without a connection and reconcile cleanly once it returns.
Store submission
We handle App Store and Google Play submission, review requirements and release, not just the build.
What you get
- Technical spec, architecture and timeline up front
- Testable build on device every sprint
- Your repository, full code access throughout
- App Store and Google Play submission
- Support and iterations after launch
Stack we use
- React Native
- Expo
- TypeScript
- NestJS
- PostgreSQL
Proof of work
Zapys24 Mobile — Booking Apps for iOS and Android
Two Expo apps on one backend: the client app with map discovery, booking and push notifications; Zapys24 Pro for schedules and staff. Both are published on the App Store and Google Play.
Read the full case study →Frequently asked questions
How fast can you build a mobile app?
A focused app takes 6-8 weeks; one with a full backend, payments and complex flows runs 10-12. Our React Native crypto wallet went from design to shipped app in 6 weeks. The timeline is fixed in the technical spec before development starts.
Native or cross-platform — React Native or Swift and Kotlin?
For most products React Native is the right call: one codebase ships to both stores at close to native performance, for roughly half the cost of building twice. We will recommend fully native only when an app is genuinely performance- or hardware-bound, and say so honestly.
Do you build the backend too?
Yes. Most apps need one — accounts, data, payments, notifications. We build the NestJS backend and API alongside the app, so it is one team and one coherent system rather than two vendors pointing at each other.
Do you handle App Store and Google Play submission?
Yes. Submission, review requirements, store listings and the first release are part of the project. Getting through review is often where solo builds stall, so we take it to the finish.
How much does mobile app development cost?
We price in fixed-price sprints with the scope agreed before each one. After a discovery call you get a detailed proposal with a timeline and total — free and with no commitment.
Have a mobile app in mind?
Tell us what you want to build. You will get a technical assessment and an estimate within 48 hours.