ML Engineer applicants have rated the interview process at Optum with 3 out of 5 (where 5 is the highest level of difficulty) and assessed their interview experience as 100% positive. To compare, the company-average is 64.9% positive. This is according to Glassdoor user ratings.
Here are the most commonly searched roles for interview reports -
It has the HR screening first. Then multiple rounds of technical interview. I am currently in the HR screening process so there is nothing I can tell on the reviewing process.