After my resume was reviewed, I was sent a HackerRank challenge with six questions in three hours. These were to be answered using Python or C++. The problems were of increasing difficulty. The concepts I needed to know included stdin read, prime factorization, unbiased estimation of σ, matrix rotation, dice reroll expected value, and nested postfix-infix conversion. A phone screen was later arranged.

One coding OA, one math video OA, and then phone interview. The phone interview also has a coding test and a math test. They both are not really hard, but I felt nervous and stuttered a little.