This case study describes how Realtor.com modernized its legacy lead and referral systems to improve agility, reliability, and customer experience in a volatile real-estate market. Brillio delivered a standardized cloud-native “paved path” by moving repos from GitHub Enterprise to GitHub Cloud, transitioning workloads from team-managed ECS clusters to centrally governed AWS EKS, and improving observability and governance. CI/CD was re-engineered with GitHub, CircleCI, and ArgoCD, replacing Jenkins with reusable templates and automated environment configuration, while CloudFormation and ECR standardization strengthened compliance and security via scanning and pipeline gates. Outcomes included 20% AWS cost reduction over 18 months, about $10M recovered revenue, 40% faster lead time, 30% high

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