Reading Time: ~8 min read Introduction Ever wondered what actually goes into building a real backend API, not a toy example, but something with a database, real endpoints, and proper structure? I did too. So I built one. This is a breakdown of how I built a Rental Listings REST API using FastAPI and PostgreSQL as part of my developer roadmap and what I learned along the way. Prerequisites Basic Python knowledge Python 3.10+ installed PostgreSQL installed and running Familiarity with the terminal What You'll Learn How to set up a FastAPI project from scratch How to define database models with SQLAlchemy How to connect FastAPI to PostgreSQL How to build full CRUD endpoints How to test your API using Swagger UI Why FastAPI? Think of FastAPI like a very efficient waiter at a restaurant. You place an order (send a request), the waiter takes it to the kitchen (your logic), and brings back exactly what you asked for, fast, no confusion. FastAPI handles all the routing, validation, and documentation automatically.…