The interview process kicked off with a standard ~15 minute screening call with a recruiter. I was told to hold all questions about the role and their design team/process until my next interview. The immediate next step was a one week design exercise. The recruiter sent a two sentence prompt that simply asks you to design a half dozen or so screens of a mobile app that would teach a topic of your choice. This sort of design challenge is typically the last step in any interview process - it requires a couple days of work to identify a topic and formulate your approach, wireframe several concepts, bring a concept up to a polished visual design, and package it all into a presentation. After sending my presentation, I was told I would hear back within two days. Ten days later, the recruiter called me out of the blue to give me a standard rejection line, and that she was not able to provide any constructive feedback on the project. This interview process shows a complete disrespect for the candidate's time. Right out of the gate, they expect you to invest many hours into your candidacy, but are not willing to give you anything in return. I never had an opportunity to speak with the design team, nor did I get any sort of opportunity to present my work and get feedback on how to improve. I think every self-respecting designer at some point learns to value their time and to never do free work. I would not recommend applying to Duolingo, unless it is one of your top choices.