Fortinet Software Developer QA interview questions

The interview process started with a call from HR. The HR called on my mobile for the screening without any heads up. The second step was a coding assessment. They sent a zip file through email which contained an instruction file plus the questions. It was so unusual as the test took more than 5 hours. Then they reached out to me for a 2.5-hour technical interview. One of the interviewers didn't show up, two other interviewers didn't turn their cameras on and they were not very polite and there was no ice breaking.