The assessment is 10 questions with some multiple choice and fill-in-the-blank related to API requests, SQL, and JavaScript, and a final algorithm question asking you to solve a more complex problem with any language you want. I was confident for most of it but didn't complete the last algorithm question in time; had it mostly done but it wouldn't pass any tests. I still moved onto the next round so don't worry about being perfect, just do as much as you can.