Currently Principal Developer at ZenRobotics: programming machine vision and robots with technologies like Clojure, OpenCV, Python, and ROS, but more recently mainly sysadmin/operations work with Ansible, Puppet, some Docker. Before that, customer data analytics at Xtract (since absorbed into Comptel) with R, Python, Java, and various databases. Long ago, academic research in data mining at Helsinki University of Technology (some old publications).
Math olympiad coaching, occasional contributions to matplotlib, sometime programming lessons for schoolkids. Long ago, subeditor of a math-department outreach publication, Solmu.