Uber Software Developer interview questions

I was contacted by a recruiter and I asked for 2 months to prepare for the interview. I had the prone screen in which I proposed two approaches and I solved both but it was not the optimal solution. The recruiter told me that they were not sure if I should pass to the onsite, so they scheduled another phone screen. I was expecting another algorithm challenge but it was more like a class design pattern problem, I didn't do well and I didn't pass to the next steps.