Project Description We are looking for an experienced backend developer to build an automated integration between PYN Booking (Romanian PMS / Channel Manager with Open API) and TTHotel (TTLock hotel system). The goal is to automatically generate time-limited PIN codes for hotel room access based on reservations received in PYN Booking. ⸻ System Overview Reservations are created in PYN Booking from multiple sources (Booking.com, Airbnb, website, walk-ins). When a reservation is created, updated, or cancelled, the system must automatically manage room access via TTHotel API. ⸻ Integration Flow 1. Reservation is created in PYN Booking 2. PYN Booking sends reservation data via webhook or API 3. Middleware service processes the reservation 4. Room is mapped to a smart lock 5. TTHotel API generates a PIN code valid from check-in to check-out 6. PIN code is sent automatically to the guest 7. On reservation update or cancellation, access is updated or revoked ⸻ Required Integrations PYN Booking • Webhooks or API endpoints for: • reservation_created • reservation_updated • reservation_cancelled Required reservation data: • reservation_id • room_id or unit_id • check_in datetime • check_out datetime • guest_name • guest_email • guest_phone • reservation_status ⸻ TTHotel (TTLock) • Use TTHotel Open API • Required actions: • create time-limited PIN codes • update PIN validity • revoke PIN access on cancellation ⸻ Middleware Responsibilities • Receive and validate reservation events • Map rooms to lock IDs • Calculate access validity windows • Generate PIN codes via TTHotel API • Send PIN codes to guests (email required, SMS optional) • Handle updates and cancellations correctly • Log events and handle API errors ⸻ Technical Requirements • Backend development (Node.js, Python, or PHP) • REST API integration experience • Secure webhook handling • Clean, documented code • Lightweight database for room-lock mapping • Deployment-ready solution (VPS or cloud) No frontend or UI is required. ⸻ Deliverables • Fully functional middleware service • Working integration with PYN Booking API • Working integration with TTHotel API • Configuration and setup documentation • Basic test cases for create, update, and cancel reservation scenarios ⸻ Important Notes • The solution must be reusable for future hotels • Code ownership will belong to us • Experience with hotel PMS or smart lock systems is a plus