First round was a call with the hiring manager, which was my favorite conversation- she was so interesting and well-spoken and articulated the mission really well
Second was with the CTO, who was also excellent. He asked about my experiences, some working style questions
Third was a FE exercise with 2 engineers- this was good. I am a backend engineer primarily so I struggled a bit, but they were helpful
Fourth was a BE exercise with 2 engineers- also good
I ended up accepting a different offer that came along first, but I had a great experience interviewing with Instrumentl