I had passed the Triplebyte interview, so they allowed me to skip to the on-site. Typically, I believe they have a pre-screen with the Triplebyte multiple-choice test, followed by a technical screen over the phone.

I also completed a non-technical phone screen with my potential manager. During this, they asked sort of technical questions, such as, "Describe a complex system you've worked on."

Build a fairly simple, familiar game in the terminal (they tell you which game), using the language of your choice.

You have 90 minutes to complete it. This is mostly about seeing how you organize your code, and name your variables and other things like that.