BY DAY: full stack java+js+postgres for cloud healthcare software. BY NIGHT: advanced experiments in self-replicating code. Imagine:

[info] Running 'java Replicator1.class'
[info][info] Running 'java Replicator2.class'
[info][info][info] Running 'java Replicator3.class'

(except more complicated, and I can introduce random mutations...)

Another project was my docker dev infrastructure. I arranged some containerized SonarQube, Nexus, GitLab, DNS, HAProxy, etc so that I have professional dev tooling, and I can scale or move services to another physical machine without any headache. I basically have a mini-internet across several computers, so I can test things under realistic conditions.