I applied for the internship on my school's website in October 2018 and received an email the second day asking me to complete a coding test. I completed the coding test. The problems were fairly easy and open-ended.

Two days later, I received the interview invitation.

For an array of integers, propose an efficient algorithm that places all the negative numbers before the positive numbers.

It's about a project on my resume. The interviewer asked me to explain the machine learning models I used for that project.