I have been working at US Department of Justice full-time (More than 3 years)
Great place to work, great benefits, great people, and serving a great cause.
Your pay is under a GS schedule, so it's kinda hard to get a raise.
I applied online. The process took 4+ months. I interviewed at US Department of Justice.
Two group interviews, each with a junior, midlevel, and senior lawyer. In one of their offices, so was a bit crowded. Each was 30 minutes long. Left time for me to ask questions at the end.