Mobile App Development — iOS & Android from Helsinki
Cross-platform iOS and Android apps built with React Native and Expo. One efficient codebase, two platforms, production-ready delivery. Senior mobile development from Helsinki — 70 €/h + VAT.
Start a projectWhat we build
Cross-platform iOS and Android apps
One React Native and Expo codebase that runs natively on both iOS and Android. Significantly cheaper to build and maintain than two separate native teams.
Native device features
Camera, biometrics, push notifications, offline storage, deep linking, GPS and Bluetooth — either through mature React Native libraries or custom native modules.
Backend API and data sync
Paired backend development: REST or tRPC APIs, authentication, real-time sync, and offline-first architecture when connectivity cannot be guaranteed.
App Store and Google Play submission
Full submission support: screenshots, metadata, privacy policy, compliance requirements, review responses, and TestFlight / internal testing setup.
Who it's for
- Companies that need a mobile companion to an existing web product
- B2B businesses digitising field operations, inspections or service workflows
- Consumer startups launching a mobile-first product or marketplace
- Teams replacing an ageing native app with a cost-efficient cross-platform solution
- SaaS companies that need to meet a customer requirement for a mobile app
Common questions
Do you build for iOS and Android simultaneously?
Yes. We build cross-platform with React Native and Expo, meaning one codebase covers both iOS and Android. This significantly reduces cost and maintenance overhead compared to two separate native development teams.
Can you publish to the App Store and Google Play?
Yes. We handle the submission process including screenshots, metadata, compliance requirements, and review responses. First-time App Store submission typically takes 1–2 weeks for Apple review after the build is ready.
What if I need native device features like camera or biometrics?
React Native has mature library support for most device APIs. For anything requiring a custom native module, we write the bridge code or select the right library — this rarely requires a fully native app.
Can you maintain and update the app after launch?
Yes. Post-launch maintenance — new features, platform OS updates, dependency upgrades and bug fixes — is available on an hourly or monthly retainer basis.
Ready to build your mobile app?
Tell us what you're building and when you need to launch. We'll confirm scope and timeline within one business day. 70 €/h + VAT.
Start a project