The HR did not explain much details in the recruiting process. Got rejected without explaining reason and did not even proceed to hiring manager stage. If my background did not match in the first place, why did HR bother arranging an interview in the first place?

The interview process was pleasant but with many breakout sessions. If you have a full-time job, a bit hard to schedule for all the interview sessions. Questions are a mix of technical and behavioral

This occurred at the Singapore branch of Illumina. They were seeking a scientist specifically for material characterization and with experience with thermogravimetric analysis. The interview was conducted online with 3 - 4 members with the hiring manager attending online. Despite answering their questions, they appeared disinterested throughout the whole interview session and seem to be reading questions off a binder. After the interview, I realized they updated their LinkedIn job description to include more details and notably, they required an "experienced" scientist which wasn't present previously.