Ask HN: What is best tool for technical interview tests?

My company will be interviewing people remotely. I am responsible for doing technical tests for the candidates. I would like to use an existing tool for that initial test. Something that will give a time restricted test to the candidates with questions that need to be answered and some small coding challenge that can be done all in browser. We will be looking for frontend developers so technical interview will contain HTML/CSS/JS coding challenges.

Can you recommend any existing tools?