I applied through my law school. The interview was a 20 minute video conference with a senior associate.
The associate was really nice, he was interested in getting to know me and my interest in the firm and are I applied for rather than technical questions.
Foreign Associate applicants have rated the interview process at King & Spalding with 2 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 66.2% positive. This is according to Glassdoor user ratings.
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