Supporting custom frameworks and upgrades at scale using Moderne

How does a four-to-six person platform team keep 500 engineers and 200+ Java microservices on current versions of Spring Boot, Java, and Gradle? Stacey Watro (Staff Software Engineer) and Ellen DeWitt (Software Engineer) from Squarespace’s API and Service Frameworks team walk through their multi-year move off a homegrown automation tool and onto Moderne: what broke at scale, the zero-ticket ingestion job that scans the GitHub org and builds LSTs on a schedule, version-controlled custom recipes layered on top of open source OpenRewrite recipes, and a Java 17 / Spring Boot 2.7-to-3.3 migration spanning more than 40 recipe entries.