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·14 weeks
From single-tenant to multi-tenant SaaS in 14 weeks
A 40-tenant B2B SaaS hit the ceiling of its single-tenant architecture. We migrated to Postgres RLS, custom domains, and metered Stripe billing — with zero downtime.
THE PROBLEM
[1/3]
- 01Each new enterprise deal required ~2 weeks of DevOps to spin up a dedicated tenant.
- 02No feature-flag discipline; each tenant drifted to its own branch.
- 03Security review blocked a 7-figure Fortune 500 deal over data-isolation doubts.
- 04Stripe billing was manual; revenue leakage estimated 4–6%.
THE SOLUTION
[2/3]
- Postgres Row-Level Security for per-tenant data isolation; audited by an external security firm.
- Custom domain provisioning + automatic SSL at the edge.
- PostHog feature flags keyed by tenant group (Free / Pro / Enterprise).
- Stripe Subscription + metered billing, wired through webhook → Postgres → cache invalidation.
- Admin portal for ops to switch tenants with full audit log.
Technologies
Next.jsPostgres RLSStripeVercelCloudflareDatadog
THE OUTCOME
[3/3]
- 01Enterprise onboarding: 2 weeks → 4 hours
- 02Fortune 500 deal closed 11 weeks after migration
- 03Revenue leakage under 0.3%
- 04Zero downtime during cutover (phased, tenant-by-tenant)
- 05Platform now serves 120+ tenants on shared infra