After initial phone interview, 2-3 additional interviews. Additional interviews were in person with various members of the engineering team and upper management. Prepare for the interview and you should be fine. I did have to take a written math test during the interview.
Engineer applicants have rated the interview process at ESC Spectrum with 4 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 46.1% positive. This is according to Glassdoor user ratings.
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