DRW Software Engineer interview questions

I applied for the Software Engineer - Elixir role at DRW for their London office. I went through an initial screen that involved having a conversation about my background. The next interview was an interview with the hiring manager. Unfortunately, I went into the hiring manager interview with wrong expectations because I was informed that the interview would be more of an in-depth technical conversation about my previous roles. What actually happened was that it was a full-blown technical interview about Elixir. Normally, I would be able to answer such questions, but my mind went blank because of the fact that I was blindsided by what the interview actually was. I did not pass the second round so I do not know what the next steps will be after this.