Applied in response to Expression of Interest. Weeks or months later you hear back and get an interview, but you aren't told which project it's for or what skillsets are necessary.

Weeks or months go by, and you get an interview with a project team. Weeks or months go by before they start background checks, which also takes weeks.

Once complete, then you have more weeks before they give a formal offer, and then you start four weeks or so later.

Technical skill questions which you have no idea might be asked, because they don't tell you up front.