3 rounds of interview.
1st was an HR screening (the 3rd party payroll company did this as it was for a contractual role) Basis questions around salary expectations, notice etc.
2nd Round: Product case study with a couple of product folks. Nothing challenging, just regular product case type questions
3rd Round: With the CTO/Hiring Manager. To the point, related to the work you would be expected to do. Went deeper into the details. Really liked the straight-forward and to the point nature of questions