Software Engineer (Contractor) applicants have rated the interview process at Illumina 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 58.8% positive. This is according to Glassdoor user ratings.
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I was able to speak to a hiring manager through a reference. The email laid out exactly what to expect in our interview with a laid out schedule of times. I was happy to find out that the interview questions were not mind bending but you do need to know you're basic programming principles since they use .NET stack. They asked me algorithm questions dealing with recursion and included some interface design.
Interview questions [1]
Question 1
Something about recursion and how it would compare to a non-recursive solution