Backend development on Fastify: fast APIs on Node.js

I develop server-side on Fastify because I care about how much useful work a server does per request and how few resources it wastes. I start by describing data flows and contracts between your API and its clients, then design routes around JSON Schema validation: invalid data is filtered at the entry point and never reaches business logic, and the framework serializes responses at near-native speed. My goal is a service that remains predictable under load and simple enough that the next developer understands it in an evening.

Everything is built from plugins with clear boundaries: authorization, database access, caching and logging live in isolated modules that can be tested and replaced independently. Connection pooling, reasonable timeouts, graceful shutdown and health checks I lay down from the first commit, write integration tests against real routes and prepare the application for containers and horizontal scaling. If your service on Express or old Node falls under traffic, I move the hot spots to Fastify and show the throughput difference on your own hardware. The result is clean documented code and benchmarks confirming the numbers.

— Validation by schemas and fast JSON serialization
— Plugin architecture from isolated modules
— Load testing, profiling, throughput tuning
— Container readiness, health-check and graceful shutdown