A recruiter from a consulting firm contacted me on LinkedIn. I had a brief phone call with the recruiter and submitted my resume.

I received a phone call from a particular team (trading).

It was scheduled for an hour-long phone interview, which went 10 minutes over the hour. There was no resume review or introduction; we jumped straight into coding questions.

Two questions were asked:

• The first was a LeetCode Hard problem.
• The second was a LeetCode Medium question.

I got stuck with the Hard problem for quite a long time, which prevented me from totally solving the Medium question. However, I explained how I would solve it, and the interviewer seemed okay with my approach to the second problem.

The interviewer was cooperative and encouraging. He patiently answered my questions at the end of the interview. Overall, it was a good experience with great questions.

Given a string that contains only lowercase letters, remove three or more identical letters in sequence. Ensure that after removal, no sequence of three or more repeating letters remains. Repeat this process as many times as possible.