This article details how Uber successfully migrated one million lines of JUnit code in just two weeks using the Moderne platform. It highlights the strategies and tools employed during the migration process. The focus is on the practical aspects of large-scale code modernization.

Uber successfully migrated its stateless container orchestration platform from Apache Mesos to Kubernetes, leveraging the industry's standard for enhanced stability and functionality. The migration involved overcoming significant challenges related to scale, integration, and feature parity while implementing custom solutions tailored to Uber's specific requirements. Future blog posts will detail additional migrations within Uber's architecture.