The product looks interesting but their interview process is pretty horrible. The total interview is 5 hours of your time, excluding the initial recruiter chat.

The worst part was after the last round I didn't hear anything for a week then the recruiter sends me an email along the lines of "... looking for a slightly different scope of experience for this role". That's so vague and if my experience didn't match the role why waste 5 hours of my time ( and theirs ). I asked for clarification and of course she ghosted me! Unless a person has limited interview options I definitely would not recommend wasting one's time with their process

Build a tree with 2 endpoints for fetching the tree and adding a new node.

In the next round they ask how to delete a node.