I was approached by a recruiter who submitted my application for this job. A while later the hiring manager called me over the phone and he asked a number of typical HR question. Then they sent me a machine learning challenge and I needed to solve in two days. Afterwards, I had an interview with two of the senior researchers. They mainly asked about what I have done before. Interviewers were nice people and it was a pleasure talking with them. When interviews where over, I waited for around a month not hearing any feedback. One day, just out o the blue, they gave me a few days notice to travel to Oxford for the final interview! Since I didn't even possess a U.K. visa, I asked them to conduct the interview in another format (maybe a video call). It was then that they decided not to continue with my application. I have a general suggestion; If you are applying from abroad, the interview process with this company might not go smoothly. It took a very long while to get any sort of feedback after each round of interview. The hiring manager generally didn't reply to my emails. And, in spite of giving me feedbacks such as "we are impressed by your solution/CV/ etc." after each interview, they suddenly decided to drop the application.