It is kind of a unique process. You start doing a coding challenge with the language you choose for the position and later you send your resume and a cover letter (which is important). The coding challenge is pretty fun to implement but it has to be pixel perfect with what they asks and needs some in depth knowledge of the language you choose and CSS to make a concise solution. Even if your solution works, if it is too over-engineered, it won't pass. I saw people complaining that the feature is weird and unreasonable, and perhaps what you need to implement is not a performant choice for a production product, but I personally think the whole process of the challenge and submitting the solution tests well the basics of what you need for the position (and I had good time implementing it too). For the interview part, they were very polite and kind.