Problem, approach, outcome, and the architecture decisions with their tradeoffs. Filter stacks combine: pick two tags to see projects using both.
Delivery drivers work for hours with no connectivity, then sync. The hard problem is not the sync, it is what happens when the field and the office disagree.
Rent a scooter or e-bike from an app: scan the QR, the physical lock opens over cellular, ride, park in a permitted zone, pay by the minute from a prepaid wallet.
Two-sided marketplace for architecture and design work: the platform holds the money until delivery is confirmed, with bidding happening in real-time chat.
A complete restaurant operating system on one multi-tenant backend: customer ordering, driver dispatch, owner dashboard and point of sale.