I interviewed at Jump in London, the process took 2 months. The first stage was a technical zoom interview and then it was an on-site interview. Interviews are very intense, I was asked many problems on a variety of disciplines: maths, programming and statistics. The questions and problems were interesting though. The team is nice and people are very friendly. Although I didn't get an offer, I enjoyed the interview process.

Few Hr calls prior and between. First round: Probability questions, questions on general ml knowledge: lasso, ridge, mathematical justification of gradient descent, prob inequalities, linear algebra and geometric interpretations of probability. Final Onsite: Leetcode problems, stats, harder probability problems, deeper into ml knowledge: linear regression basics, pca, linear algebra, questions on the classes you have taken. ML knowledge is very much needed.