Optiver

The first round was a phone interview with HR. A week later, I was asked to complete a technical phone screen. This screen was conducted by a software engineer and focused on binary search trees, including time complexity and traversal. The question

Contacted with a HackerRank challenge, followed by an HR interview. After this was a short technical screen. The technical screen was very short and did not feel like it gave you a good chance to display your technical knowledge.

I was contacted by a recruiter, and he told me about the opportunity at Optiver. I sent him my resume, and I was selected for an online test, but I couldn't make it past that test since the questions were difficult to answer.