First, I had a Skype call in which I was asked to do a trivial coding task followed by some less trivial, but still reasonably basic technical questions. This was followed by an on-site interview. At the on-site, I was first shown a demo of their product and this was followed by a coding challenge. The challenge was simple conceptually, but the bulk of it required you to learn how to use an external library to perform some task. You're allowed to use the internet as much as you want, but since the library changed so much over the years none of the code examples online work as they are written (they do warn you about it though). It threw me off-guard as it wasn't a problem solving question and I took longer than expected to complete it. After that I had a talk with the head of their development team and given a tour of the office. All the people were very nice to me.

Had a skype interview with a lead engineer where I worked on a coding exercise on a shared online editor. Then we talked more generally about the role, my experience, etc.