We had a 30-ish minute phone interview where they asked me to talk a bit about myself, then about resume experience and projects. They also asked me to explain one of my projects in technical detail, focusing on "how does it work" and providing as in-depth an explanation as I could. Next, they posed a series of technical questions related to computer architecture and virtual memory, similar to those found in academic quizzes.

A few weeks later, I had a virtual onsite interview scheduled. This interview would have been conducted in person if not for the COVID-19 pandemic. I participated in three virtual meetings throughout the day. During these meetings, I discussed my interests and experience, elaborated on my work and project experience in more detail, and answered several technical questions. Some were quiz-like, and one would have been a whiteboard problem in person, but I explained the solution verbally. They also asked me about myself and if I had any questions regarding the job or company. One meeting lasted 30 minutes, allowing me to ask questions after the technical portion concluded quickly. The interviewer provided very lengthy responses, so I only needed to ask about five or six questions.

Subsequently, I received an email requesting that I re-apply because the Job ID for the role had changed. A few days later, another email asked for consent for a background check, followed by one scheduling a discussion about the offer.

Given a buffer of bytes representing a list of elements of some arbitrary type, return a list of each unique element paired with its frequency of occurrence in the original list. The list should be in descending order of frequency.