Quanergy Solutions Software Engineer interview questions

The interviewer called me on schedule and asked me about my familiarity with C++ and STL. He asked me about my experience with ROS and OpenCV and asked about my availability to fill the position. Then he explained the idea of Quanergy and about the growth. He then said I will have to schedule for an interview with somebody from the software team and I mailed him my schedule. The interview was then scheduled the next week.

I had a phone screen and then was invited to the onsite. It was a bit chaotic as they couldn't figure out who exactly will be interviewing me. But that was okay, I ended being interviewed by about five different people. Standard interview process with some behavioral questions, some technical questions and questions about my experiences. After the interview I received no updates. I followed up with the hiring manager but he just ignored me. I would've understand if they just told me I wasn't a good cultural fit or they found someone better, but apparently they think completely ghosting an applicant is acceptable. Very unprofessional to have me spend an entire afternoon interviewing with them and not even bother telling me a "no". Maybe the hiring manager got fired or something.