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1. AI & ML·Tutorial

   Building a RAG Pipeline That Actually Works: Chunking, Embeddings, and Evaluation

   Build a RAG pipeline that holds up in production: chunking strategies, embeddings in pgvector, hybrid search with RRF, reranking, citations, and evaluation. · Yahia Rachek

   • You don't need a separate vector database to start. The [pgvector](https://github.com/pgvector/pgvector) extension adds a `vector` type, distance operators, and approximate near…

     text§ A table for chunks

   • CREATE EXTENSION IF NOT EXISTS vector;

     sql · line 1§ A table for chunks

2. Backend·Guide

   REST API Design Best Practices: Building APIs Other Developers Love

   A practical guide to REST API design: resource URLs, status codes, RFC 9457 errors, keyset pagination, idempotency keys, ETags, versioning, and rate limits. · Yahia Rachek

   • Clients branch on `type`, a URI that should resolve to documentation for that error. `title` is a stable summary, `detail` explains this occurrence, and `instance` identifies it…

     text§ The Problem Details format

3. JavaScript·Deep dive

   The JavaScript Event Loop, Finally Explained: Tasks, Microtasks, and Rendering

   Learn how the JavaScript event loop runs tasks, microtasks, and rendering in browsers and Node.js, with runnable ordering puzzles and fixes for a blocked loop. · Yahia Rachek

   • Node adds a queue that browsers don't have: `process.nextTick()`. When Node drains microtasks, it empties the next-tick queue first, then the promise queue, and repeats until bo…

     text§ process.nextTick vs promise microtasks

4. Backend·Deep dive

   Database Indexing Explained: How B-Tree Indexes Really Speed Up Your Queries

   How PostgreSQL B-tree indexes work, how to read EXPLAIN plans, and how to design composite, covering, partial, and expression indexes that actually get used. · Yahia Rachek

   • CREATE EXTENSION IF NOT EXISTS pg_trgm;

     sql · line 3§ Common indexing mistakes