Eigen X interview questions

Quick meeting with HR who I liked and they moved me to the next roundand asked for a presentation. The intervew with 3 people went well, but they wanted something that would knock their socks off. I only have so much time in the day becuase I am interviewing with lots of companies. My model was good, but not earth shattering. This was a long shot for me. They wanted an expert developer they could put right in fromt of the client. Although I know I have the skills, I am very competant with technology, but I am not what you would call 100% expert in this application even though I love working in it. For example, my code was good, but they were doing deep dives into code that would enhance performance. Like I said it was a tough sell, but I enjoyed meeting with their team. They showed me respect and got back to me in a reasonable point in time telling me they chose someone else. That's all I ask. Good company with excellent reviews.