Cloudflare etc that others have already posted are excellent by your definition. Uber blogs are surprisingly good. https://eng.uber.com/ https://eng.uber.com/

Cloudflare etc that others have already posted are excellent by your definition. Uber blogs are surprisingly good. https://eng.uber.com/ https://eng.uber.com/ Or more technical and less business goal focussed: https://jepsen.io/analyses https://jepsen.io/analyses https://lemire.me/blog/ https://lemire.me/blog/