SaaS migration and modernisation
summary
Three migration paths with concrete trade-offs: VPC-per-tenant full-stack silo (lift and ship, control plane adds onboarding and billing), layered migration (extract web/identity into shared services using Cognito user pools with a tenant claim, ALB token routing, S3+CloudFront), and service-by-service migration to a fully multi-tenant microservice fleet with centralized metering, logging and per-tenant billing. SafetyCulture’s numbers (EKS, ~300 services, ~7,000 pods, Postgres, 5+ PB) show scale implications. AWS provides an open-source SaaS Builder toolkit with serverless, EKS and ECS reference architectures.
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chapters (11)
- 0:00Introduction to SAS migration
- 1:51Problem statement and goals
- 4:00Modernization strategies overview
- 8:33SAS infrastructure patterns
- 10:17Full stack silo migration
- 12:06Layered migration approach
- 13:30SAS identity and routing
- 16:36Service by service migration
- 19:29Strategy comparison and summary
- 20:10Safety Culture’s journey
- 26:37AWS SAS builder toolkit
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