Frontend Engineer applicants have rated the interview process at Forward 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 35.2% positive. This is according to Glassdoor user ratings.
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Forward is successful for a reason. Their screening and interview process is intense. It's clear junior developers won't succeed considering they ask questions that only experience can grant you the answer to. I'd recommend looking over systems design and harder leet code problems.