DField SolutionsMérnöki stúdió · Budapest
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CASE STUDIES · saas

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.

Timeline14 weeks
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Reviewed by
01 / Enterprise onboarding2 weeks → 4 hours
02Fortune 500 deal closed 11 weeks after migration
03Revenue leakage under 0.3%
04Zero downtime during cutover (phased, tenant-by-tenant)
The problem01 / 03
  • 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 solution02 / 03
  • 01Postgres Row-Level Security for per-tenant data isolation; audited by an external security firm.
  • 02Custom domain provisioning + automatic SSL at the edge.
  • 03PostHog feature flags keyed by tenant group (Free / Pro / Enterprise).
  • 04Stripe Subscription + metered billing, wired through webhook → Postgres → cache invalidation.
  • 05Admin portal for ops to switch tenants with full audit log.
The outcome03 / 03
  • 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
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