Everbridge Full Stack Developer interview questions

I had only one technical assessment round where there were multiple choice questions based on backend, frontend and database. Had answered them fairly well. There was one coding challenge from front end which was very extensive (adding business logic, creating UI elements and also styling them) and there wasn't enough time given to solve it. I am really not sure what the company is trying to achieve with a very short, timed coding assessment that too for frontend. In real life we really don't do such extensive applications within so limited time. Anyways the time constraint made the assessment really hard.