Led critical Stripe payment provider migrations including custom scripts for customer imports, subscription recreation, and billing cycle handling across multiple gyms.
Contributed to the complete mobile app redesign and architectural migration from Firebase/Firestore to PostgreSQL with proper REST API implementation.
Developed backend endpoints for memberships, bookings, and payment flows, integrated Stripe webhooks, and provided direct technical support to gym owners. Built features based on real user feedback, debugging production issues across the full stack from mobile UI to payment processing.