Initial phone screen, 1:1 interview, Case Study Interview, On Site interview. Duo has an exceptional interview process. I truly felt their process allows them to evaluate your skills and fit, but also provides you the opportunity to learn about the company and the job. The case study was challenging and fun and helped me get a good sense of what the job would be about. The recruiting team was exceptionally helpful and responsive. They introduced me to other Duo employees so that I could ask questions and get a better understanding of the company culture.