The interview was for a frontend position. During the conversation with the hiring manager, it was mentioned that I would be the only frontend engineer in the team. However, the interviewer was a backend engineer. The question was about how to create a progress bar for loading very large files on the frontend. As I was not familiar with the readable stream API, I implemented a progressive version.
Just had the morning interview and surprisingly received the notification that I passed. Scheduled to meet the team next Friday.