ProjectWizard

"Subscription & Feature Entitlement System" is a scalable multi-tenant SaaS architecture designed to manage subscriptions, feature access, and usage limits dynamically through a database-driven approach.

Key Features:

• Multi-Tenant Architecture: Supports multiple organizations with strict data isolation using organization-based scoping.
• Dynamic Subscription Management: Handles plan lifecycle (Free, Pro, Enterprise) with active and expired states.
• Feature Gating System: Controls access to features dynamically via database-driven mappings without hardcoded logic.
• Usage-Based Limits: Enforces limits on resources like projects and members with atomic operations.
• Centralized Middleware Enforcement: Authentication, feature access, and usage limits are handled via a clean middleware layer.
• Concurrency-Safe Operations: Uses database transactions to prevent race conditions and ensure data consistency.
• Read-Only Expiry Mode: Expired subscriptions retain read access while restricting write operations.

Technology Stack:

• Frontend: React for building a responsive and interactive UI.
• Backend: Node.js with Express for scalable API development.
• Database: PostgreSQL (Neon) with Prisma ORM for efficient data handling.
• Authentication: JWT-based authentication with tenant context.

How I Built It:

I designed this system to replicate a production-grade SaaS subscription model with scalability and flexibility in mind. The architecture separates concerns across middleware, service, and database layers, ensuring clean and maintainable code. Multi-tenancy was implemented using organization-based isolation, while all subscription and feature logic was driven from the database to avoid hardcoding. Atomic transactions were used to enforce usage limits safely under concurrent requests. The system is built to be easily extensible, allowing new features and limits to be added without changing the core structure.

This project demonstrates how modern SaaS platforms manage subscriptions, enforce feature access, and scale efficiently while maintaining clean architecture and high performance.