Staff Engineer applicants have rated the interview process at 1Password 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 51.4% positive. This is according to Glassdoor user ratings.
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There are multiple rounds focusing on various areas, including technical experience and soft skills. Be prepared with details on what you've done and the impact it had. You may only get 30 mins, so try to be concise while still conveying key takeaways.