Junior IOS Developer applicants have rated the interview process at DoorDash 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 35.3% positive. This is according to Glassdoor user ratings.
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There was a small amount of friendly talk, then they asked me to code. LeetCode or something similar would be good preparation, basically your typical 1st round interview. I happened to get stuck on the problem, but I think I just boggled down, rather than it truly being difficult.