Backend Guides

Practical, copy-pasteable backend notes by Abdelilah Ommane.

• How to Build JWT Authentication in NestJS

  NestJS Passport + JWT walkthrough for protecting your API routes.

• PostgreSQL Indexing for Backend Developers

  When and how to add indexes without tanking write performance.

• What Is Agentic RAG? A Backend Developer's Intro

  Connecting LLMs to your data with retrieval-augmented generation.

• How to Dockerize a NestJS API

  Multi-stage Dockerfile + Docker Compose with PostgreSQL.

• How to Connect PostgreSQL to NestJS with TypeORM

  Wire Postgres into NestJS and inject repositories cleanly.

• How to Build a REST API with NestJS (Step by Step)

  Controller, service, DTO — a minimal end-to-end API.

• Redis Caching in NestJS

  Cut DB load with @nestjs/cache-manager + ioredis.

• Deploying NestJS to Kubernetes

  Deployment, Service, and Ingress for a zero-downtime rollout.

• Building Agentic RAG with Python and LangChain

  Let an LLM agent retrieve and reason over your private data.