JadeCircuit is a small studio that designs, builds and ships mobile and web products — iOS, Android and full-stack web, with the APIs and integrations behind them. Swedish founder · Estonian-registered company · straightforward international contracts and invoicing. We also bring rare, first-hand HarmonyOS experience when a project needs it.
About
JadeCircuit is led by a Swedish developer building mobile and web products end to end — design, frontend, backend and release. Most of what we make is our own: indie apps we design, build and publish ourselves, which keeps our cross-platform and backend skills sharp for the client work we take on.
The company is registered in Estonia, giving clients a stable European base for clean, straightforward international contracts and invoicing — wherever in the world the project is. We currently work from Shanghai, which also gives us something rare: deep, first-hand experience inside Huawei's HarmonyOS platform, a specialty we offer on top of the usual iOS, Android and web.
Selected work
iOS
Android
HarmonyOS
A daily puzzle game with 18 hand-crafted word, logic and pattern puzzles — a fresh set every day, with streaks and rest days. Cross-platform across iOS, Android and HarmonyOS, fully local-first with no account required.
Visit mongi.app
LED
Web
Integrated AI
Electron
My contribution to a large-scale art installation in a contemporary art museum: a live LED news-ticker system. A Fastify + SQLite server polls global news feeds, with integrated AI categorizing and tagging every headline, and streams updates in real time over SSE to a browser display — wrapped in Electron on a Mac mini — that drives the gallery's LED panel. Includes a searchable archive and a fullscreen kiosk mode.
iOSAndroidWebHarmonyOS
Tournament platform and companion mobile app for an international football event — a full-stack web platform and a cross-platform app (iOS, Android, more) sharing one API, built to integrate cleanly and scale for event week.
HarmonyOS
A currency converter covering 170+ currencies, backed by a Go API with historical rates, geo-aware caching, and live refresh.
HarmonyOS
A five-language input method editor for the Nordic languages — Swedish, Danish, Norwegian, Finnish and Icelandic — with on-device dictionary suggestions and autocorrect, built natively for HarmonyOS.
Services
iOS and Android from a single Flutter codebase — native feel, multi-language localization, and store release handled.
Next.js, React and TypeScript front-ends with Postgres / Prisma data layers and modern, reliable deploys.
Go and Node APIs on SQLite / Postgres and Docker — including integrating with existing platforms and third-party services, with careful handling of user data.
A specialty when you need it: native ArkTS / ArkUI apps for Huawei phones, tablets, foldables and wearables.
Building for Huawei devices? HarmonyOS app development for international companies ↗
Contact
Inquiries, collaborations, new projects — drop a message.
hello@jadecircuit.com
