FNewsteer

The problem

• Price moves fast and spreads widen around scheduled high-impact news.
• Traders who miss a release time take losses they could have avoided by staying out.
• FNewsteer shows when a blackout window is open or about to open.

What it is

One Python backend serves every surface, so a window means the same thing everywhere.

• A FastAPI service that owns the calendar and the blackout logic.
• A Chrome extension that shows the state next to the charts.
• A React Native and Expo app with Dashboard, Calendar and Settings tabs, onboarding and an Android home screen widget.
• A FastMCP server, so the same data is available inside Claude Desktop.

The hard parts

• Metro and NativeWind configuration conflicts left the mobile app on a blank screen until resolved.
• The watchlist had to stay in sync across screens, which an in-process event bus solved.
• The Android widget rendered blank because of a misconfigured reconfigurable flag.
• Push notifications had to handle windows that are active now and windows about to start.

Infrastructure

• Code lives in a uv workspace monorepo.
• Backend runs on Render from Dockerfiles built for that workspace, with a render.yaml Blueprint.
• GitHub Actions handle CI
• Domain is on Cloudflare.