Heads of Staff
The five guys who pretend to run the station and their respective departments. Unlike other stations, nobody pays much attention to any form of chain of command, so the heads just get a lot more access to the station.
All these people used to be targets during the discontinued Revolution mode. That doesn't happen anymore either.
Captain
The boss of the entire station. With no chain of command, he's free to grab a bottle of booze and do whatever.
Chief Engineer
Ruler supreme of everyone wearing yellow, meaning the Engineers, Electricians and Miners. The other engineers will expect him to know at least the basic engineering tasks, mainly how to set up the engine. There is no guarantee that this is true.
Head of Security
HoS for short, he's the head of everyone wearing red or a fedora. Somewhat guaranteed to be a decent person since HoS is an application-only position. Apply on the forums, you dolt, not in-game.
Research Director
Head of all the white-suited madmen. This includes the Medical Doctors, Geneticists and Roboticists, since the Head Surgeon was made redundant due to not having anything to do.
Head of Personnel
Has even less responsibility for his underlings than the other heads. No really, don't go complaining about the Janitor to this guy. Or do, he'll be astounded. His real job is changing people's access levels as needed. This never happens.