I proceeded through two rounds and even managed to complete a case study, but after the third round, they just sent me a rejection email without any specific reason or clarification. In my experience, it's weird because it wasn't the first step, and usually, when you negotiate with companies for more than 2-3 weeks, they must give you a call and explain their position or at least write a more detailed email. This time, it was quite an awkward, generic email, as if I hadn't even proceeded to the fourth round and we didn't know each other

Four rounds of interviews: 1st with HR, second and third with team/ crossfunctional members and 4th interview with HR. They were fairly challenging, but nothing out of the ordinary. I then did the same process again 5 months later.