Senior Full-Stack Developer for Bowling System

We are looking for a Senior Full-Stack Developer, Small Dev Agency, or Engineering Team (2 to 4 members) to build a multi-channel Bowling Reservation & Inventory Management Ecosystem for Mr Joy family entertainment centers. The project is estimated at approximately 356 total engineering hours across backend architecture, UI/UX design, web e-commerce, self-service kiosk software, and admin operations. Project Scope & Key Deliverables: Core Backend Engine: Real-time slot reservation algorithm preventing overbooking across 4 bowling lanes (30-min slots + 5-min cleanup buffer). Concurrent physical stock tracking for shoes. Time calculation engine for combined admission tickets. Dual QR code emission for main turnstiles and for counter/bowling access. Integration with legacy POS API and Payment Gateways / Pinpad terminals. Self-Service Kiosks (Tótems) & Web E-Commerce Checkout: Interactive UI for on-site self-service kiosks with physical card reader / Pinpad integration. Responsive web reservation portal for advance online booking (up to 7 days). Admin Panel & Operations Dashboard: Live visual lane monitor for counter hosts (color-coded timeline: active play, 25-min warning alert, 5-min cleanup buffer). Manual host override, shoe size assignment, and automated stock release upon return.