Applied through Microsoft website for various positions. Got a first-round on-campus interview, without indication of what job I was applying for. Was contacted about 6 weeks later, saying I was being considered for the SDET position, and to set up a trip to the main campus in Redmond for final-round interviews. Final round took all day, had 4 different interviewers across multiple buildings on campus, along with a lunch interview. All expenses for trip were paid, including travel and lodging.