A 24-Chapter Reference Series

Backend from
First Principles.

A comprehensive deep-dive into backend engineering — from HTTP fundamentals and routing, through databases and caching, all the way to Kafka, WebSockets, and production deployment. Each chapter is a self-contained field manual.

24 chapters Go · Python code + theory
01HTTP & CORS→ 02Routing in Backend→ 03Serialization & Deserialization→ 04Authentication & Authorization→ 05Validations & Transformations→ 06Controllers, Services & Middlewares→ 07API Design (REST)→ 08Databases→ 09Caching→ 10Task Queues & Background Jobs→ 11Full-Text Search (Elasticsearch)→ 12Error Handling & Fault Tolerance→ 13gRPC & Inter-Service Communication→ 14Configuration Management→ 15Logging & Observability→ 16Graceful Shutdown→ 17Backend Security→ 18Scaling & Performance (Part 1)→ 19Scaling & Performance (Part 2)→ 20Concurrency & Parallelism→ 21Docker, K8s & CI/CD→ 22Automated Testing→ 23Message Brokers & Kafka→ 24WebSockets & Real-Time→