There were 2 interviews. The first was 30mins mainly asking me technical javascript questions such as "What is hoisting?" with a simple algorithm question at the end. The second interview was longer. It started with an algorithm question and transitioned onto debugging/implementing features in a simple vanilla js app.

General interview process I guess. Start with a 30 minute phone call with their HR/Recruiter going over company background, the role, and my past experience, follow that up with 2 1-hour technical interview with their development team.