Marcus Sterling
Verified ContributorFull-Stack System Architect
SaaS Multi-Tenant Billing Core
Enterprise Next.js dashboard with Stripe subscriptions and dynamic RBAC security
Project Overview
Built a high-performance, multi-tenant SaaS application core featuring dark/light theming, granular permission roles (Admin, Editor, Member), and real-time subscription lifecycle management.
The Challenge
The client needed to launch their enterprise SaaS product in under 4 weeks with complex tier-based usage limits and seamless Stripe checkout integration.
The Architecture Solution
Delivered a modular Next.js 14 platform with Tailwind CSS, FastAPI asynchronous REST microservices, and Stripe Webhook event listeners managing customer subscription states.
Technical Architecture Highlights
- Next.js 14 App Router with React Server Components for sub-50ms initial page loads.
- Custom Stripe billing engine with invoice PDF generation, proration logic, and customer portal.
- JWT and HTTP-only cookie authentication with role-based middleware guards.
- Optimistic UI updates with SWR/React Query for instantaneous dashboard responsiveness.
Key Features & Capabilities
Multi-Tenant Isolation
Complete data segregation between organizations with custom tenant subdomains.
Stripe Subscription Engine
Supports recurring monthly/annual plans, usage metering, one-off upgrades, and trial periods.
Audit Log & Activity Feed
Tracks every team action, login attempt, and permission modification with timestamped audit logs.
Exportable Analytics
Interactive charts with one-click export to CSV, Excel, and branded executive PDF reports.
“RareBros delivered our SaaS platform ahead of schedule. The code was exceptionally clean, well-tested, and handled our 12,000 user launch without breaking a sweat.”
Technology Stack
About the Contributor
Full-stack specialist with deep expertise in Next.js App Router, Stripe custom billing engines, and enterprise RBAC authorization systems.
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