It was a one hour tech screen. The first 15 minutes were a discussion of my past experience. Questions asked included, "Tell me about some of the models you've worked with? What was the impact? What were the features? What were you experimenting with." Another question was, "tell me about a time you were 50% of the way into a project and decided to pivot." Then we spent ~40 minutes on a coding question. The coding question was to implement a rate limiter capable of enforcing a maximum number of requests per second for each source (e.g. IP address). The last 5 minutes were for me to ask questions.