The behavioral phone screen was pretty simple and standard. I was told the next day that I would do a technical phone interview.

This phone interview process was terrible. The interviewer had an incredibly thick accent, which made it really difficult to understand what he was saying. I eventually had to ask him to type out the questions he was asking on our shared HackerRank page.

One of the questions was incredibly difficult (a combinatorics question). Seeing as I did not have a math background, I was unable to answer it. I shared the problem with several math major friends, and even they struggled to come to the right answer.

When I heard that I was rejected, I asked for feedback so I could improve on future interviews, and I never heard back from them.

How many different ways are there to paint a fence if no more than two adjacent fence posts can be the same color?