Dark matter developers, according to Scott Hanselman, are those developers in the industry who get things done, despite running “old” code

[W]e should welcome more talks, blog posts, and books that give guidance for “real software environments”: what coding, testing, and shipping looks like with short-staffed teams, teams without dedicated devops experts, and teams where everyone who originally built the system has left.

(source: Building for the 99% Developers)