Reading about djb makes me feel really unproductive and stupid :) He wrote daemontools and solved most issues that systemd tries to solve years ago, wrote qmail and basically designed the blueprint for writing secure daemons on Unix. He wrote a secure wrapper for using C library functions safely, created a build system that is similiar to NixOS and solves most of the pains of the Unix filesystem hierarchy. Wrote a secure BIND DNS replacement and I've probably forget lot's of other archivements in cryptography and mathematics linke DNSCurve, ECC ciphers and MACs. https://cr.yp.to/djb.html