Developed a REST API for the E-Procurement and E-Catalog platform, facilitating vendor registration, project tender participation, product and service catalog management, and vendor order processing for PDAM Tirta Benteng Tangerang. Tech Stack Backend: NestJS (TypeScript) Database: PostgreSQL, MongoDB Caching & Queue: Redis Authentication: JWT Third-Party Integration: Gmail API, Firebase Key Features ✅ Vendor Registration: API for registering vendors and managing vendor profiles. ✅ Tender Participation: API to allow vendors to participate in published tenders. ✅ Tender Publication: API to publish new tenders for vendor participation. ✅ Order Processing: API for ordering and purchasing products/services from vendors.