Explore modern software practices in legacy systems through an insightful interview with Audun Fauchald Strand, principal engineer at NAV, and Kevlin Henney. Delve into the modernization of the open-source platform NAIS, discussing topics such as organizing massive amounts of data, the potential benefits of legacy code, and implementing open-source practices in governmental software teams. Learn about domain-driven design in legal contexts, microservices vs. CQRS, building developer culture, and applying Data Mesh and observability principles to complex systems. Gain valuable insights on navigating the challenges of updating long-running platforms while maintaining transparency and efficiency in large-scale software development projects.