Yandex

The process involved sending an application, contacting HR, writing a review on a paper, and then completing three interviews: one for math, one for deep learning, and one for general ML knowledge. The whole process took two months. Overall, it was

Implementation of basic data structures using only std libraries. Simpler is better. You should know programming language concepts and possess minimum memory expense. An interviewer may help sometimes by asking guiding questions.

I had failed the second of three algorithmic sections. To my knowledge, there should have been three algorithmic sections and then interviews with teams. Overall, the experience was pleasant and not stressful.