B2B SaaS

• The application owns its canonical tenant, membership, authorization, data-isolation, and billing domain.
• Enterprise SSO or directory provisioning is a real customer requirement rather than speculative roadmap scope.
• PostgreSQL is the system of record for domain data.
• Durable asynchronous workflows are material to customer onboarding or operations.

Next.js provides the product surface; WorkOS supplies enterprise identity integrations; PostgreSQL remains the application system of record; Stripe owns payment primitives; Inngest handles durable event-driven work; Vercel hosts the web application. The application must map these systems through stable tenant and user identifiers.^{12345679101112151618}

Cost shape

Managed hosting and database costs combine with enterprise-identity connection/user pricing, payment volume, and durable function execution. Enterprise identity often introduces the least predictable commercial tier.^81113141719

Platform dependence

High. Keep application-owned tenant/user keys, policy, billing state, event idempotency, and PostgreSQL records so identity, workflow, or hosting providers can be replaced independently.^{79101112151618}