Tennis.ru App

A high-load mobile ecosystem for a major sports complex, handling millions in monthly transactions with banking-grade stability. Two apps under one brand: a tennis court booking platform and a gym subscription management service — sharing the same architecture, payment systems, and backend infrastructure.

Booking & Payments

Real-time court availability with instant booking and integrated payment processing. The gym app manages monthly subscriptions with automated renewals and access control. Both systems handle peak loads while maintaining sub-second response times and transactional integrity.

Concurrency & Caching

The booking engine uses PostgreSQL Row Level Locking to prevent double-bookings under concurrent access. DragonflyDB serves as the caching layer, providing Redis-compatible in-memory caching.

Architecture

Built on Capacitor 6 for native mobile deployment, with Bun/ElysiaJS powering the backend API. The frontend uses React/Vite for a fast, responsive interface, backed by PostgreSQL with Drizzle ORM for type-safe database operations.

Key Highlights

• Two apps, one platform — tennis booking + gym subscriptions on shared infrastructure
• Row Level Locking — PostgreSQL-based concurrency for zero double-bookings
• DragonflyDB caching — millisecond reads for schedules and availability
• Personal account system — purchases, bookings, statistics, subscriptions
• Native mobile — Capacitor 6 for iOS and Android
• High-load ready — handles peak booking periods without degradation