Notes, tools, and small experiments.
An independent studio working on developer tooling, networking experiments, and the occasional weekend prototype. Mostly written down so we don't forget.
Recent notes
Reading TLS handshakes without a debugger
What the first few hundred bytes of a connection can tell you, and how to make sense of ALPN, SNI, and session resumption when everything is encrypted.
A tiny scheduler that survived production
We replaced a cron pile with 400 lines of Go. Here is where it broke, and the three changes that made it boring.
About
Lumen Lab is a small two-person practice. We build internal tools for teams that have outgrown spreadsheets, and we keep our notes public. Occasionally we take on consulting work around Go services and network software.