Challenge
Software houses use 5+ different SaaS tools (CRM, billing, project mgmt, monitoring). Data is scattered, integrations break.
Solution
Hub with 14 micro-frontends loaded via Module Federation, NestJS micro-services backed by MongoDB + NATS event bus. Stripe billing integration. Single sign-on through auth-frontend.
Results
Single login, unified dashboards, zero data duplication. Deployable as Docker compose on DigitalOcean.