Uber Software Developer interview questions

Applied online and they responded about a month later. It was a smooth process -- the recruiter was very responsive and welcoming. She was very accommodating to the restricted times I could interview with them at.

I ask a friend help me refer software engineer position. HR setup a phone screen and give me a code challenge. At that week, I am really busy interviewing and gave them one of my existing project(they allow me to do that). After that, they think it's good and move forward to a technical phone screen. And this week, recruiter send me email that after they review my codes again, they want to cancel my phone screen. This is my first time meet situation. that's totally doesn't make sense, just a phone screen, come on! My project is not bad at all. They waste me few days to prepare for them. And In their email, they said they didn't provide any feedback and ask me to reapply after one year. Almost the worst interview experience I had before. I am a uber user and after this, I don' like it anymore.