1d ago · 14 min read · I have a production SaaS running on AWS Lambda with Fastify. Single tenant, single customer, everything working great. Then the second customer signed up. That's when things got interesting. Suddenly
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12h ago · 3 min read · How I Built a Real-Time Trading Automation Engine with Node.js I once lost $2,400 in 15 minutes because my trading bot couldn't keep up with market moves. The REST API polling interval was too long, and by the time my bot detected a signal, the oppor...
Join discussion1d ago · 15 min read · Introduction "It works on my machine" is the most expensive sentence in software. The cure isn't more discipline — it's a pipeline that makes deployment so boring it can't fail interestingly. In this
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2d ago · 13 min read · I Built a RAG App That Chats With Any PDF — Here's How TL;DR: I built DocMind — a multimodal RAG (Retrieval-Augmented Generation) app that lets you upload any PDF, image, or document and ask questions about it in plain English. No API keys needed — i...
Join discussion2d ago · 13 min read · TL;DR: The event loop is how Node.js handles thousands of concurrent operations with a single thread. It's not magic — it's a loop with 6 phases, each processing a specific type of callback. This post breaks down every phase with diagrams, shows you ...
Join discussion2d ago · 18 min read · TL;DR: I helped build Mstock, a stock trading platform handling 100K+ concurrent users during market hours. This post walks through the full system design — from WebSocket connections for live prices, to order matching, to the caching and database la...
Join discussion2d ago · 13 min read · How Redis Caching Actually Works — A Visual Guide for Backend Developers TL;DR: Redis caching sits between your application and database, storing frequently accessed data in memory for sub-millisecond reads. This guide walks through cache-aside, writ...
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