Node.js

Event loop overview

Streams overview

Errors and process exit strategy

Env config basics

Logging basics

Express/Fastify overview

Validation patterns

Auth middleware basics

Rate limiting overview

OpenAPI overview

SQL basics

ORM/Query builder overview

Migrations & seeders

Indexes basics

Transactions overview

Unit tests (vitest/jest) basics

Integration tests for APIs

Mocking DB and services

Test data strategy

CI pipeline basics

Caching overview

Queues overview

Monitoring overview

Security checklist overview

Deploy checklist overview