Case studies, incident reports, and design decisions from engineers who shipped them, edited and checked before they're published. Software craftsmanship, one real problem at a time.
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AI & MLTutorial
Build a RAG pipeline that holds up in production: chunking strategies, embeddings in pgvector, hybrid search with RRF, reranking, citations, and evaluation.
Yahia Rachek16 min readBackendDeep dive
Eight workers can respect Retry-After and still exceed one API key’s allowance. A runnable Node.js model shows how to coordinate request admission, cooldowns and a shared retry budget.
Moving repos from Azure DevOps to GitHub loses your contribution graph, leaks tokens, and freezes pushes. How Vector migrates them safely on any OS.
FrontendTutorial
Build a canvas exporter that checks the encoded image before enabling a download. Handle format fallback, explicit JPEG backgrounds, failed exports, and object-URL cleanup.
BackendDeep dive
An older live-sports update can arrive after a newer one, leaving an AI agent with the wrong score. A runnable Node.js example shows the race condition and how version checks, duplicate handling, freshness limits, and reconciliation help prevent misleading answers.
AI & MLGuide
The limitations in using RAG models include issues related to scanned PDF documents and tables, as well as the lack of context of the document, leading to incorrect responses. Learn how to improve the performance of your document retrieval process through OCR, chunking methods, multimodal RAG, and metadata filters.
Manan Electro AI Lab10 min read
BackendGuide
When to call a service directly and when to send a message, plus timeouts, retries, circuit breakers, idempotent consumers, the outbox pattern, and sagas.
Yahia Rachek15 min read
FrontendGuide
Fix Core Web Vitals on real sites: measure LCP, INP, and CLS from real users with the web-vitals library, then apply the fixes that move your 75th percentile.
Yahia Rachek13 min read
DevOpsTutorial
Ship zero-downtime deployments with Docker and GitHub Actions: graceful shutdown, readiness checks, blue-green with Compose and Caddy, and safe migrations.
Yahia Rachek15 min readReal code from a published article, checked by an editor before it went live.
ReactDeep dive
Learn how React Server Components work, what the use client directive really marks, and how to fetch, stream, and mutate data safely in the Next.js App Router.
Read the full walkthrough
import { notFound } from "next/navigation";
import { getProduct } from "@/lib/products";
import { CopyLinkButton } from "./copy-link-button";
export default async function ProductPage({
params,
}: {
params: Promise<{ id: string }>;
}) {
const { id } = await params;
const product = await getProduct(id);
if (!product) notFound();
return (
<main>
<h1>{product.name}</h1>
<p>{product.description}</p>
<CopyLinkButton />
</main>
);
}Solved something the hard way? Write it down for the next developer.
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No. 1Yahia RachekNo. 2Manan Electro AI Lab