In this session we will explore the strategic and technical processes behind migrating Vox Media’s extensive portfolio—including Vox.com, Polygon, and The Verge—from the proprietary Chorus CMS to a headless WordPress multisite. Attendees will learn about creating a new backend editorial workflow, managing extensive data migrations, and developing a custom GraphQL API for Vox’s “Duet” frontend. Key takeaways include methods for customizing CMS to fit specific editorial needs, essential factors for successful large-scale migrations, effective collaboration with internal teams, and ensuring a smooth launch day. This session is ideal for those curious about the complexities of large-scale CMS migrations.