The interview process is rather standardized, with a few stages to pass.

First, a recruiter screening, then a first technical call, and then a day of several (in my case, 4) interviews:

• Algorithms and Data Structures
• Probability and Statistics
• Machine Learning System Design
• Hiring Manager interview

All the stages were at least doable. The questions are designed in a way that you can for sure start somewhere and then develop the task to a certain level. The interviews were not stressful, and the interviewers were quite friendly and helpful. They give you enough time to prepare for the interviews (it's okay to schedule the call in 2-3 weeks).

It took a while to receive feedback after (almost 2 weeks).

Both technical screening and algorithms interviews were LeetCode-style questions. I never saw exactly the same problems on LeetCode, but very similar (Medium level).

Probability questions involved complex roll-a-dice or coin scenarios (i.e., combinatorics) – like computing the probability of an event.

ML System Design questions related to Pinterest business tasks.

Hiring manager interview: Be ready to discuss teamwork, show your soft skills, and possibly leadership qualities.