• Full stack lead DevOps role supporting the DynID authentication subsystem (Python, Chef, Ansible, Git, MockServer, Jira, Docker, PostgreSQL, nginx, Varnish, Redis, Celery, Jenkins) ◦ Lead engineer with full responsibility for the authentication system ◦ Repaired and improved broken metrics and monitoring, using graphite, sensu, grafana, and collectd ◦ Tracked down and mitigated a problem with slow enrollments tripping a 20 second timeout; after optimizing that database query, that step completed in a few milliseconds ◦ Improved service scale to handle an abrupt 20X increase in peak load ◦ Documented the stack to assist in security audits and new team member training ◦ Simplified and automated deployments • Supporting work to help move the original DynDNS Remote Access service to cloud hosting (Docker, Kubernetes, Ansible, C, Node.js) ◦ Found and fixed 2 decade-old potentially exploitable bugs in public-facing services, one in C and the other in Node

• Implemented a REST API for automated account provisioning (Python, Django, Git) • Designed and implemented a replacement test framework API; 10x speedup, significantly more robust and readable; the improvements meant that we were able to easily find (and fix!) dozens of tests that were not testing what we thought they were (Python, Selenium, Requests) • Designed and implemented plans to reduce the fallout of cross-datacenter failovers • Tracked down and mitigated the primary cause of intermittent test failures on a high-profile, late project; unblocked a team of 30

Back-end software development. I worked on a number of geolocation-related projects as well as a refresh of the BGP alarms product. One of the geolocation projects had an amusing side effect, in that we were able to identify a host that a provider halfway around the world had moved across the country to a location hundreds of miles away from where it was supposed to be. As the purpose of that host was to provide telemetry from a specific location, that contract was terminated promptly.

Responsible for Linux and Unix maintenance of the cross-platform InterMapper server; started an automated testing initiative and handed it off to the new QA department; led the effort to unify and modernize the version control and build infrastructure; designed and implemented a web API for InterMapper; diagnosed a major performance problem and implemented a fix that increased performance by 6 orders of magnitude during a multi-year optimization project.

Wrote control software with a unique pedagogical interface for biofeedback devices and operant conditioning chambers used in the Psychology of Learning class at Dartmouth College. Wrote software for an instructional feedback system using WiFi-equipped PDAs and a web-based controller; an early version was described in Wired Magazine 10.10. Wrote an interactive adaptive learning system for the Psychology of Learning class.