Field notes
Longer write-ups of one piece of work each: the problem as it looked at the time, the constraints that shaped the design, the diagram I wish I had had, and the details that bit. Newest first.
One owned surface in front of every third-party provider our integration environments talk to. Per request it mocks, forwards, calls us back later, or lets a running test answer live. Five diagrams on the resolution ladder, callbacks and the evidence trail.
Le Cercle turns four million Journal officiel appointments and a dozen open datasets into a map of who staffs the top of the French state. What it took to make the map trustworthy without editing a single row by hand.
Every E2E suite eventually reinvents a worse database administration tool. Replacing ours with an API that owns state: run tokens, asynchronous teardown that recovers, and orphans you can see.