Open company culture with plenty of opportunities to learn and grow. Ownership is very welcome, so you can shape your own area of responsibility.
Very nice and open-minded colleagues, nice team events involving sports and fun. Some nice perks & benefits on top of salary.
Cons
Workload in startups tends to be high, for me this is not a problem at all as I am thankful for this learning journey, but you need to be able to set your own boundaries.