Standard process - Recruiter phone screen, team member phone screen, 4 engineers on site. Lots of whiteboarding, every interviewer had me spend 3/4 of their time whiteboarding. Overall pleasant, everyone was nice even though things were a little disorganized. They look for "fit" (whatever that means), and so tend to throw curveball questions picked from stackoverflow to size up.
It's very much an old school, 90s company - big monolith, big database, lots of SQL, crazy hacks here and there, owns hardware... lots of old timers, lifers, some very young kids who couldn't make it google but ready to jump ship asap. Solid customer base, but with lots of uncertainty around acquisition, felt like things were more in maintenance mode. Some work already outsourced to eastern Europe.