It may be a good start to write something in go, e.g. a command line tool. Start from scratch. If you make it open source you can show it to potential employers

It may be a good start to write something in go, e.g. a command line tool. Start from scratch. If you make it open source you can show it to potential employers... First focus on shipping (goreleaser), then on improving the code (unit and Integration testing). Perhaps read code from other open source projects and submit pull requests. This way your learning and self promoting process helps others... Remember to be polite, your employers may also read comments ;-)