Spa Chain Management System is a production platform supporting the day-to-day operations of a multi-location spa business. The system covers booking and scheduling, membership and loyalty programs, payment processing, reporting, and operational workflows used by both customers and internal staff.
The backend handles several workflows where correctness matters beyond basic CRUD — including booking capacity under concurrent requests, multi-method payments and failure recovery, asynchronous membership renewals, benefit redemption consistency, and reporting over large operational datasets.
My contributions were primarily backend-focused, with stronger involvement in membership & loyalty and payment workflows, alongside booking, background processing, reporting optimization, deployment, and production support. I also proposed and implemented several technical approaches used to address concurrency, payment recovery, asynchronous processing, timezone handling, and reporting performance.
Production scale — as of August 2026
20K+ registered users · 6 locations · Up to ~250 bookings/day