Waymo Engineer interview questions

I had a call with an engineer on their team. I signed an NDA so I can't go into the specifics of the interview. After the call it was very difficult to get a response from the HR. I think they were interviewing other candidates in parallel, and had me on some waiting list, so they weren't willing to provide me with a concrete response. I wrote to them about once a week - the HR would promise to get back to me by the end of day and then would not contact me. Finally, she told me they found someone else when I contacted her about 4 weeks after my initial interview. She forgot to update me after they had made a decision. I think my interview process was handled poorly by them.