Principle Engineer applicants have rated the interview process at Ecolab 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 69.1% positive. This is according to Glassdoor user ratings.
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HR phone interview, spoke with technical manager briefly, nothing special, questions were easy and very high level, both people I talked to were very nice and clearly happy at Ecolab