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Technical Architecture — ØSTEN AI

Components​

  • Frontend: Next.js App Router, Firebase Auth, Axios apiClient
  • Backend: Express/TypeScript on Cloud Run, PostgreSQL (Cloud SQL)
  • AI: Vertex AI for plan generation
  • Integrations: Google Ads, Meta, TikTok, GA4

Tenancy & Auth​

  • Firebase ID token → backend auth
  • x-organization-id header enforced by tenantMiddleware

Resilience​

  • Service-layer fallbacks (demo accounts, template plans)
  • Error handling via ApiError and Express error middleware

Observability​

  • Structured logs with org/user context
  • Deployment strictness: fixed secret/var names to avoid breakage