How things actually work.
I'm Muhammad Umar. I take one thing apart at a time and write down what I find, from B-tree indexes and floating point to why a retry can bring down the system that was fine a minute earlier.
Every claim is either sourced or something I ran into myself, and each piece says which.
Latest writing
20 pieces so far. Deep dives that take one thing apart until it makes sense, and shorter essays on building software alone.
Why Your Docker Image Is 2GB
Issue #20 · August 5, 2026 · 6 min read
Nobody Cares What You Built. They Care What Broke.
Issue #19 · July 9, 2026 · 6 min read
Why Your Report Is Off by One Day
Issue #18 · June 12, 2026 · 7 min read
Why Your AI Output Is Mediocre, and It Is Not the Prompt
Issue #17 · May 16, 2026 · 5 min read
About me
Everything here is written by one person. I build software alone for B2B teams in Europe, mostly AI features, internal tools, and automation, and I take things apart in public because it is a better answer than telling you I am good at this.
I also do this for a living
Custom software, AI features, and automation for European B2B teams. One senior engineer, start to finish. If any of the writing above sounds like the way you want your problem handled, that is the most useful thing I can show you.