Don't waste your time.
They ask LeetCode hard-type problems and expect you to know the solution upfront.
The questions were irrelevant for the role and were rather focused on how good you can memorize LC problems.
The technical recruiter didn't like the fact that I forgot some API and asked him for help.
Besides, if you study for that type of interview, then better apply to FAANG.
LeetCode Hard:
The following metrics were computed from 36 interview experiences for the Grammarly Software Engineer role in United States.
Grammarly's interview process for their Software Engineer roles in the United States is fairly selective, failing a large portion of engineers who go through it.
Candidates reported having very good feelings for Grammarly's Software Engineer interview process in United States.