On a phone, every detail shows. Black River builds fully native apps – Swift and SwiftUI on iOS, Kotlin and Jetpack Compose on Android – that feel instant, survive bad connections and look at home on each platform, together with the backend that keeps them running when usage takes off.
What we build
- Native apps – iOS and Android, sharing one design system and one API, from first prototype to store release.
- Real-time features – chat, presence, live updates and rich push notifications.
- Backends that scale – APIs, geo-indexed search and matching, media pipelines and CDNs, load-tested and autoscaled.
- Monetisation – subscriptions and in-app purchases through StoreKit and Google Play Billing with server-side validation.
- Quality – automated UI and unit testing, crash monitoring, staged roll-outs and store review support.
We also connect apps to hardware – Bluetooth sensors and accessories – and add AI features where they help users.