I have been assisting riseup.net by adding [1, 2], and porting [1, 2, 3] custom features to SYMPA, the open source software they use for their mailing list service. Development is in Perl and involves working with the upstream maintainers. Verifying bug-fixes and feature additions through a custom testing framework on virtual infrastructure to simulate their large transaction use-case pushes this role from a Software Engineering position to a DevOps (Monitoring, Operations Security, Database Administration, Systems Integration, and Systems Development).
Riseup.net has proven to be a solid collective that provides secure and reliable communications solutions. I appreciate the group because of their years of dedication to an anarchist praxis whose usefulness extends beyond their immediate community.