I went through: 1. First round interview - Overview and discussion 2. Second round interview - Another discussion-based interview, more technical questions 3. Third round - in-person (F2F) with 6 people in total lasting almost 6 hours in total spent in the office. Including the CEO. 4. Fourth round - after being told there was a possiblity the company could not afford to hire me until Q3, I waited ,after which I was offered a fourth round of interview. 5. Rejected due only to the CEO's decision, who I was told gave me a positive review after the third round.