I applied through college or university. I interviewed at Viken Detection (Boston, MA)
Interview
After second round of interviews (which was also the second last one), they decided to close the opening. Not fair.
First round - HR
Second round - Tech interview - mostly about resume and projects and technical stuff related to the projects
Third round - coding on-site
Offer
Mostly behavioral, about past experiences and projects, interviewed with 3 different people. Before that was a phone screen. On site interview had the 3 people, also met other employees during interview.