SWE applicants have rated the interview process at Duolingo with 3.5 out of 5 (where 5 is the highest level of difficulty) and assessed their interview experience as 50% positive. To compare, the company-average is 47.5% positive. This is according to Glassdoor user ratings.
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I didn't pass the hackerrank, but I believe there's a few more technical rounds after that. The response after the hackerrank was prompt, and the initial recruiter contact point was prompt too after submitting an application
First you are given an online assessment (which is on the harder side) and then you do a Karat interview. I believe there is one more round after that, but I didn't make it there.
Interview questions [1]
Question 1
Show you functions / variations of functions that do the same thing and you have to analyze runtime/space