ONYX Graphics interview questions

Company sent me an offer and revoked it with no explanation. Company did not provide a professional interviewing experience. The interview process started with calling me and beginning a 30 minute interview without scheduling a time to talk. I ended up having to take the call and interview while driving down the road with a barking dog in the backseat since I was not prepared or told to prepare a quiet place to interview. They then forgot to send me 2 of the 3 calendar invites for later on interviews after saying they would. I had to follow up to be added and she stated she forgot both times. I thought it was all was ok as the rest of the interviews were basic behavioral and went ok. I was then called after 3 rounds rounds of interviews post-screener call when I was offered the job and signed an offer letter. Two business days later, they emailed saying they were revoking the offer without explanation.

Included a small project requiring you to write a simple program, demo and share the code as part of the interview process. Also various questions including code and logic problems.