This conference talk explores how Zipline leverages Backstage to drive monorepo adoption as organizations scale. Learn how to address the challenges of onboarding new applications to a monorepo while supporting the migration of hundreds of existing applications with unique infrastructure and observability requirements. Discover how Backstage's core features like Software Catalog and Software Templates enable developers to deploy new applications on AWS and Kubernetes in just 10 minutes, complete with pre-configured Grafana observability and PagerDuty/Slack on-call integration. The presentation outlines a methodical approach for introducing Backstage features during monorepo growth and provides practical tips for adapting these practices to your organization's specific needs.