Our World in Data will send you a multi-hour coding exercise based on their open source codebase if your application is chosen. The next interview would be an 1.5 hour panel of a few engineers and hiring team. Most of the interview consists of technical and behavioral questions. The team doesn't allocate more than 5 or 10 minutes for candidate questions, which is weird given this is the first face to face interview. The process overall comes across pretty cold and academic. It was slow and delayed in parts and they didn't seem particularly curious or friendly. Their team doesn't write tests for their codebase that's why they are constantly fixing issues.