SobatKamera - Camera Sell & Rent Marketplace

SobatKamera is a full-stack camera rental marketplace I designed and built solo, where photographers can rent gear from nearby stores and sellers can run their own shop. Behind the simple browsing experience is a backend built for correctness: row-level locks, conditional stock updates, and optimistic locking keep two customers from ever booking the same camera, and parallel-request tests verify it. Payments run through Xendit with verified webhooks and safeguards that protect paid orders. The catalog is sorted by distance and rental radius is enforced server-side, and a dedicated BullMQ worker handles background jobs while the API stays up even if Redis goes down.