Multi-tenant SaaS platform with custom branding engine serving 148 agency clients, generating $89K MRR with 99.99% uptime and enterprise-grade security — enabling agencies to resell AI automation under their own brand.
Vantage AI, a Chicago-based AI automation agency, had built a powerful suite of AI tools — workflow automation, chatbot builders, and lead scoring engines. Their problem wasn't the product; it was distribution. They wanted to let other agencies resell these tools under their own brand, but their existing infrastructure was a single-tenant monolith deployed once per client. Every new agency meant spinning up a separate server, manually configuring branding, and hand-coding billing integrations. Onboarding a single tenant took their CTO two to three weeks of dedicated work.
At 23 tenants, they were already drowning. Their billing was tracked in Google Sheets. Branding changes required a developer to SSH into each client's server and update CSS files. When one tenant's traffic spike brought down another tenant's instance (they shared a database), their CTO knew the architecture wouldn't survive past 50 clients. They needed a platform that could scale to hundreds of tenants without scaling their engineering team linearly alongside it.
We rebuilt their entire infrastructure as a true multi-tenant SaaS platform — one codebase, one deployment, 148 completely isolated tenants. Each agency gets their own branded experience with custom domains, logos, color schemes, email templates, and login screens, all configurable through a self-service admin panel without writing a single line of code. Under the hood, tenant isolation is enforced at the database level using PostgreSQL Row-Level Security policies, ensuring zero data cross-contamination even if application code has bugs.
The billing engine was the second critical piece. We integrated Stripe Connect so each agency tenant can manage their own end-customer subscriptions, while Vantage automatically collects their platform fee. Usage metering tracks API calls, AI model tokens, and storage per tenant in real-time, with automated overage billing and self-service plan upgrades. The result: $89K MRR with zero manual billing intervention.
Complete white-label customization — custom domains, logos, colors, email templates, and login screens per tenant via self-service UI.
PostgreSQL RLS-enforced data isolation with shared infrastructure, supporting 148 concurrent tenants with zero cross-contamination.
Stripe Connect integration with real-time usage metering, tiered pricing, overage billing, and self-service plan management.
Granular RBAC with platform admin, agency owner, manager, and end-user roles — each with configurable permission sets.
RESTful API with tenant-scoped rate limiting, API key management, webhook delivery, and auto-generated documentation portal.
Kubernetes-based infrastructure with horizontal pod autoscaling, zero-downtime deployments, and per-tenant resource quotas.
Built with production-grade infrastructure designed for multi-tenant scale and enterprise reliability.
We went from manually onboarding agencies in 2-3 weeks to having them fully white-labeled and live in under 4 minutes. The billing automation alone saved us 30 hours a month — no more spreadsheets, no more chasing invoices. But the real game-changer was the branding engine. Agencies sign up, upload their logo, pick their colors, connect their domain, and their clients never know we exist. We've grown from 23 to 148 tenants without adding a single engineer. Our MRR went from $4K to $89K in five months.
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