Oracle Netsuite senior software on-site interview

I am having an onsite interview with Oracle Netsuite .They have schedule me for 3 interview 2 are 1.5 hour each and one 30 min. The mail says in first 2 round it will be having 2 interview in panel and I need to code on laptop. I am not sure what to expect in such kind of interview. Anyone have any idea or have went through the same process plz share your experience.Thanks