3 rounds, one with HR, next with hiring manager, 3rd with founder who will ask you questions about every job you've ever had.
2nd interview was at 5 pm and then the 3rd interview was at 9 am the next day.
They do something called a threat of reference check which means they will ask about your manager at every job and what they would say about you, and then they'll call them and verify everything.
Interview questions [1]
Question 1
What year I graduated college
How would your managers describe you