One of the best interview experiences I've had at a company. First step was a 1hr video call with the hiring manager to discuss the role + some behavioral questions. Following that I had a 1hr video call with an engineer from the team. This was pretty casual (discussion of my background and the project I'd work on at Duo). After that I was invited to an all day on-site interview. This included three behavioral / product interviews, lunch with two potential team members, and three technical interviews. The first tech interview was a coding one, the second a design one, and finally a causal tech interview with one of the engineers I'd be working with. Everyone was very pleasant and there were no trick or overly difficult questions.