Enterprise SSO at Scale: Why AWS Cognito Outpaces Custom Solutions

Custom SSO solutions initially meet enterprise needs but break under real-world requirements: supporting multiple identity providers, per-tenant isolation, and provider-specific role mappings all require frequent code changes. AWS Cognito's OIDC abstraction eliminates this friction, allowing new providers to be integrated without touching application code. This case study exemplifies when managed services should replace custom architectures—a critical decision point for engineering teams handling enterprise authentication at scale.