In total, there were 5 rounds of interviews: 3 behavioral and 2 technical. It was distributed among 2 weeks. I have seen many people get offers in just 2 interviews for similar positions, but only if you have a good source inside. Many, and yes, many of these interviewers are either backdoor entries or contractors turned full-timers. I sense some TCS-kinda scam here too. Someone should start looking at this.

JWT internal implementation (as the interviewer is doing JWT community modifications at work), asked some coding questions on collections. When answered, he asked to do it in a previous version of Java, as he doesn't know Java 8.