Selected work
Cases
A handful of past engagements.
Automating a 4-studio Airbnb building
A 4-studio Airbnb building that runs its own booking lifecycle. Per-stay access codes, personalised welcome screens on wall-mounted tablets, guest-isolated WiFi for Chromecast access, and boiler / lighting control, all triggered automatically from the property management system.
Home Assistant · Node-RED · Python · MQTT
Ansible at the edge
Hundreds of on-vehicle compute boxes, all behind NAT, needed central Ansible management. Built ansible-worker, a pull-architecture Ansible runner that uses MQTT instead of SSH push. Migrated the team's existing config scripts to Ansible alongside it.
Ansible · Python · MQTT · Linux
A millennium bug, twenty years late
An in-house C billing application segfaulted on the first workday of 2020. The original developer was no longer reachable. The culprit was a Y2K patch from 1999 with a hard ceiling at year 20. Diagnosed and fixed in a few hours.
C · GDB · objdump · strace · Reverse engineering