Backend Frameworks
What you use to build the server side. Hono, Express, Fastify, NestJS, FastAPI, Django, Rails, Spring — and when to pick each.
APIs
How frontends and backends actually talk. REST, tRPC, GraphQL, gRPC, WebSockets, SSE, webhooks — and when each is the right choice.
Advanced API design
Beyond "return JSON" — resource modeling, versioning, pagination, idempotency, error contracts, auth/rate-limit placement, and the REST vs GraphQL vs gRPC vs tRPC decision for real systems.