Day 30: 30 Days of Backend Development - What I Built, What I Learned

30 Days. 30 Challenges. 1 Developer. Today marks the end of the GDGoC Bowen 30-Day Backend Challenge. Here's everything I built. What I Built — Day by Day Foundation (Days 1-5) Day 1 → HTTP & Hello World with FastAPI Day 2 → RESTful routes Day 3 → Git workflow and branching Day 4 → Dynamic path parameters Day 5 → Query params & Pydantic validation Data & APIs (Days 6-14) Day 6 → SQLAlchemy data models Day 7 → GET all items endpoint Day 8 → Serializers & DTOs Day 9 → POST create endpoint Day 10 → Production-ready routes Day 11 → DELETE endpoint Day 12 → Global error handling Day 13 → Pagination & filtering Day 14 → Swagger API documentation Auth & Security (Days 15-18) Day 15 → Bcrypt password hashing Day 16 → JWT authentication Day 17 → Permissions & ownership Day 18 → Environment variables & secrets DevOps & Deployment (Days 19-20) Day 19 → Docker containerization Day 20 → Deployed to Render Advanced (Days 21-24) Day 21 → Pytest unit & integration tests Day 22 → Database relationships