I contributed the upsert support for Ent, a new entity framework for Go. As well as a lot of bug reports and small fixes.
I contributed the RDMS support for Guac using Ent as a backend, so that you can deploy it to any SQL database.
I built the original orchestration engine for Flood Element, a browser-based load testing tool.
Duffel is an Airline API that I use to book flights. I built the Go client for it.