Optiver

Generally quite flexible, I can start/leave at different times to the rest of the team, and even change up schedule for a day if need be (e.g. for appointments). Remote work is available for e.g. sickness, though in person work is recommended and I generally prefer it anyway

Maybe one day a week, not recommended within the first year

Quite flexible. I work from around 9-9:30 until 6-6:30. Some people work earlier (8-5), others later (10:30-7:30). One day a week from home once you have passed probation.

All in person, somewhat flexible start/finish time.