First round is an OA with 2 leetcode problems around medium difficulty. Important to focus on code quality not just solving it as fast as possible.
Second round is an hour technical interview. No leetcode questions but be prepared to know the C++ language and explain computer science principles (ie data structures, inheritance, etc). No brainteasers or probability questions for me.
I didn't get to the third and fourth round but I was told its a take home assessment and then a technical interview going over the take home.
I applied through university. I interviewed at BlackEdge (Chicago, IL) in Feb 2021
Interview
First round interview was HR Screen. Second Round asked some coding questions and general experience. No mental math, like some other people have said. Asked me some standard Leetcode Easy-Medium questions.
Interview questions [1]
Question 1
Make sure you know some Graph Theory. Depth First Search, know time complexity of some of the sorting stuff. Asked me some Database questions (How do Schemas work etc)