Among the project's key deliverables was a seamless transition from a prototype to MVP and subsequently to a live scaled-up product without code rewrites. Together with the client, we achieved full mobile support with mobile-first thinking, including the client-facing app and club management tools for the staff. An innovative QR code-based payment system was implemented and integrated with external scanners and cash registers. The API we designed supports any front-end: mobile versions, web, tablets, etc., without creating additional code.