Security and reliability were built in throughout: owner-scoped access policies, rate limiting on sensitive endpoints, strict CORS, consistent error responses that never leak internal details, and automated PHPUnit tests covering authentication, fare calculation, seat checks, payments, and admin access. The platform runs on a Contabo VPS with OpenLiteSpeed, a background queue worker for emails, a scheduler for automatic booking completion, a locked-down firewall, and nightly database backups.