The backend is a simple Python/Flask/Postgres app [1] but holding off on building it out until there is more demand. Spun off a GCP Flask starter template from this repo useful for folks wanting to deploy python apps to GCP/App Engine [2]. Thanks for looking.
[0] https://www.hackforgood.dev/signup [1] https://github.com/ckahle33/hackforgood [2] https://github.com/ckahle33/gcp-flask-template