It was a very casual setting so no need to overdress. Interviewers had varying levels of intensity but most people just asked me to tell them why I wanted to work there.

Interviewed with 5 people - HR, Tech. Proj. Mgr., Mgr., Ops. Mgr./Dir. & Engr.. Was a straight-forward experience. Spoke to all the different interviewers about my experience & the company. Had a brief tour of the two sites.