Only one interview with the manager then and HR interview. You already know you get it when they invited you for a second round. Organization is a bit flat but managers are friendly and easy to deal with. They have been there for a long time.
Interview questions [1]
Question 1
My experience and if I can do what are required of me.
They asked lots of question about change management as they are in the process of merge and acquisition, this is an individual contributor role and do not lead a team