Security Researcher applicants have rated the interview process at GitHub 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 43.4% positive. This is according to Glassdoor user ratings.
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I applied online. I interviewed at GitHub (Athens, Athens, Attica)
Interview
People were friendly and polite, there was a take home test assignment which i did not complete due to lack of time, but everyone i talked to was very helpfull and encouraging