Long process: several interviews with HR, hiring managers, team leads, take home test, two technical interviews, behavioural interview. Unfortunately, cannot disclose interview details due to NDA. Whole process took couple of month. After passing all interviews, I got "draft of offer", we've discussed numbers and I've been told that "offer is practically ready, but we are waiting for approval from CTO/CEO, but this is just the formality". After about month I've been told that my offer was not approved and though before feedback was positive, suddenly they said it was negative. We've had follow up discussion with HR and they said this was one of a kind accident. I accepted it, though I was very disappointed by experience. I had interview some time ago, but I saw recently someone left review with similar experience, so doesn't look like hiring process improved since then.