I got to the final stage of interview, which was an in person on site interview that I was told would last about half a day. When I arrived, I was first paired with a man who got my name wrong and didn't seem to know who he was meant to be meeting, to talk me through the product. Following this, I went into a room with the CTO and who I believe was the head of engineering for the technical part of the interview. Both of them were really lovely at first, very interested in what I had to say. We started by talking through the code test I had already done for them and where it could be improved. I was asked to make some improvements to it. So far, so good. What really threw me off though is that the CTO was literally leaning over my shoulder watching me do this. It made me feel really on edge. In other, similar situations, I've either been left to my own devices to get on with it, or had someone sit nearby while I narrate my thought process. I've never had someone leaning over me to watch my screen like this. It made me really uncomfortable and I ended up doing a pretty poor job. Almost immediately, the CTO's demeanour changed from friendly and interested to cold and completely disinterested. I still had a whiteboard exercise to get through, but it already felt at this point that the decision had been made. The CTO left the room for the whiteboard exercise, and the man who did it (I think head of engineering) was really kind and lovely and did his best to put me at ease, but the vibe had already completely changed. It would have been a lot kinder to dismiss me as soon as the CTO lost interest instead of making me carry on with this. After it was over, I had been invited to stay for lunch previously, but was left sitting on my own in the kitchen area and told to wait there. Other employees were passing through but not one person spoke to me so I was just awkwardly sitting there for a good ten minutes before i made an excuse and left. It was just a really painful experience over all and would have been a totally different experience had it not been for the way the CTO behaved. I fully respect that I wasn't the right fit for the job, but it takes minimal effort to treat a candidate better.