It was rigorous, but the people I spoke with were all great. I felt like they were actually trying to get to know me and I felt like they were also trying to sell me on the company rather than just me selling myself to them. I liked the company. At the time they had run into market issues and froze hiring, so our process fizzled out, but I felt like it was all going well before that took place.

The first round was with 2 hiring managers, second round with same hiring managers and a peer in a panel style interview, 3rd round was a mock demo. Mock demo wasn't difficult, they gave me a context sheet. Be sure to follow the bread crumbs they give you at the top and quantify pain.