Responded to a posting on Facebook by an alumnus of my school and was leaving the position. She asked for my resume and a cover letter, 2 weeks later contacted me about an on-site interview. First interviewed with the manager; very casual and friendly. Then took an assessment, ~1 hour, then had a panel interview, about 1 hour. One member on the panel in particular was very unprofessional, made a lot of unnecessary comments, and overall seemed suspicious of me, for some reason. One of my worst interview experiences ever.