Mobile
2 posts tagged Mobile.
Jul 11, 2026
Building Rally: A Live, Crowdsourced Court Map That Stays Honest
How I built Rally, a gamified, crowdsourced map of 1,450,000+ courts and fields across nine sports worldwide, using an Expo and React Native app on Supabase Postgres with PostGIS, a Cloudflare D1 edge replica for court reads, GPS proof-of-presence check-ins, and server-side-only scoring so the crowdsourced map stays trustworthy.
React NativeSupabasePostGIS
11 min read
Jun 6, 2026
Pinned Calendar: A Self-Healing, Offline Agenda for Android
How I built a privacy-first Android app that pins your week's Google Calendar events and to-dos to a persistent, self-healing notification — no foreground service, no sign-in, and no INTERNET permission — using Kotlin, Jetpack Compose, custom RemoteViews, WorkManager, and a delete-intent that re-posts the pin the instant you swipe it away.
AndroidKotlinJetpack Compose
8 min read
