C3 AI Fullstack Software Engineer interview questions

I interviewed for a Full Stack Software Developer position. I had one hiring manager behavioral round to assess my skill set, followed by two scheduled coding rounds and one system design round (which ultimately included coding questions, as it was for a mid-level position, as the interviewer mentioned). Due to a network glitch, I couldn't attend the second coding round, but it was rescheduled. Later, I was asked to attend an additional coding round (the fourth one). During this round, I provided an optimized solution and addressed the follow-up questions effectively. All the interviewers seemed quite positive during the interviews. However, I received an automated rejection email afterward.