I initially created an HTML5/JS web app using the Spotify Metadata Web API. Once this effort was deemed worthy, I had a phone screen to go over my solution. The phone screen went well, and I was invited to the office for a four-hour interview covering the following topics:

• Overall development pattern discussion (pub/sub, MVC, etc.) with some basic JS problems
• Culture fit over a 1:1 lunch
• System design (build an app, what technologies would you use, how would you set up your database schema, etc.)
• Another review of my initial programming challenge with some algorithm-focused questions

This was for a JS-heavy role, so if you don't know JS's nuances well, you can easily get confused.

I was asking in three different contexts what the value of a variable and 'this' would be equal to for specific snippets of code.