I had total 5-6 rounds, starting from brief technical round followed by hacker rank online assessment test. I must say, it was not a good experience. The interviewers are very unprofessional. Most important thing, they don't have courtesy to respond back to the candidate with any kind of feedback. After spending almost 8 hours in interviews, they won't even come back with any kind of response or feedback. It does not have to be positive but you guys should respond back to the candidate. I was not expecting such unprofessional interview process from a company like Visa.