English writing from the front lines of technology. This is not a news site; it is a knowledge site.
Inside the products I have shipped: the constraints, decisions, what made the cut, and what was deliberately left out.
A case study of building a three-sided delivery platform — merchant, ops, and driver apps in one type-safe monorepo on Cloudflare D1, with a ten-state parcel lifecycle, photo proof of delivery, and MNT invoicing.
A case study of how I built an AI agent platform in erxes CRM in 12 days with Mastra, addressing RAG, tools, and production architecture.
A production case study of reciprocal scoring, Elo, cold start, behavioral signals, and reranking solutions in Flint’s dating recommendation system.