JiraniSoko
A neighbourhood marketplace for Kenyan urban communities. Listings, jobs, motors, and property, the categories people actually look for in places like Kilimani, Eldoret, or Kisumu. The pitch is local trust: posts come from your area, and payments go through M-Pesa rather than card rails most people don't have.
Backend is Django and PostgreSQL with the M-Pesa Daraja API for STK Push and B2C disbursements. Mobile is React Native via Expo. The Android build is in beta; iOS follows. Web admin runs on the same Django app for moderation and dispute resolution.
It's the project I think about most. It's also the one that's taught me the most about the gap between a feature working in a notebook and a feature that survives a Saturday afternoon of real users.