SaaSKit Product Requirements Document (PRD)

1. Introduction

1.1 Purpose

SaaSKit is a comprehensive framework designed to accelerate the development of Software as a Service (SaaS) applications. It provides developers with a robust foundation of essential components and features that typically require significant time and resources to build from scratch.

1.2 Product Overview

SaaSKit is a modern SaaS framework built on a clean and modular full-stack architecture. It leverages powerful open-source tools such as Next.js 15.3, React 19, Supabase, and Prisma to help developers build and scale SaaS applications rapidly and efficiently.

1.3 Target Audience

• Primary: Software developers and teams building SaaS applications
• Secondary: Technical founders and startups launching SaaS products
• Tertiary: Enterprises looking to modernize legacy applications with a SaaS model

1.4 Business Objectives

1. Reduce time-to-market for SaaS products by at least 60%
2. Lower development costs by providing pre-built, tested components
3. Enable developers to focus on unique business logic rather than infrastructure
4. Provide a scalable, secure foundation that grows with business needs

2. Product Features

2.1 Core Architecture

2.1.1 Modularity

The codebase is organized by feature and responsibility. UI components, server actions, and backend logic are clearly separated and reusable, facilitating maintenance and extensibility.

2.1.2 Server-First Approach

Built with Next.js Server Actions, enabling backend logic to live alongside frontend code without separate API routes. This streamlined approach reduces complexity and improves the developer experience.

2.1.3 Type Safety

Full TypeScript support across the stack ensures type safety from database to UI, reducing runtime errors and improving code quality.

2.1.4 Security by Design

Integrates Supabase Row-Level Security (RLS) and role-based route protection to implement robust security controls at multiple levels.

2.1.5 Responsive-First UI

Layout components are mobile-friendly, with built-in support for dark mode and breakpoints, ensuring applications work well across devices.

2.2 Authentication & Authorization

2.2.1 Authentication Methods

• Email/password authentication
• OAuth providers (Google, GitHub, etc.)
• Magic link authentication
• Two-factor authentication (2FA)

2.2.2 Multi-Layered Authorization

• Frontend protection through middleware that validates user roles
• Database security via Row-Level Security (RLS)
• Role-based access control (RBAC)
• Fine-grained permissions management

2.3 Multi-Tenancy

2.3.1 Tenant Isolation

• Secure data partitioning between tenants
• Tenant-specific configurations and customizations
• Isolated authentication and user management

2.3.2 Tenant Administration

• Tenant creation and management workflows
• Tenant settings and configuration
• Cross-tenant administration for platform operators

2.4 User Management

2.4.1 User Profiles

• User registration and onboarding
• Profile management
• User preferences and settings

2.4.2 Team Collaboration

• Team creation and management
• Role assignment within teams
• Collaborative features and permissions

2.5 Subscription & Billing

2.5.1 Subscription Plans

• Tiered subscription management
• Free and paid plans
• Trial periods and conversions

2.5.2 Payment Processing

• Integration with payment providers
• Invoicing and receipt generation
• Subscription lifecycle management

2.6 Developer Experience

2.6.1 Project Structure

/app/
  layout.tsx            → App-wide layout: Sidebar + Topbar
  /dashboard            → Main dashboard page
  /auth/login           → Authentication UI
  /settings             → User settings
  /admin                → Admin-only routes (protected)
components/
  /layout/Sidebar.tsx   → Responsive sidebar navigation
  /layout/Topbar.tsx    → Topbar with logo, profile, and actions
  /ui/                  → Buttons, Cards, Tables, Inputs, etc.
lib/
  prisma.ts             → Prisma Client config
  supabase.ts           → Supabase Client config
  auth.ts               → User session and role helpers
app/actions/            → Server Actions (form logic, DB queries)
prisma/
  schema.prisma         → Data models (User, Role, Team, etc.)
.env.local              → Environment secrets (Supabase, JWT, etc.)

2.6.2 Development Workflow

1. Create new features under /app/feature-name/
2. Add server logic under app/actions/ using Server Actions
3. Extend schema.prisma and re-sync database with Prisma
4. Define RLS policies in Supabase for secure access control

3. Technology Stack

3.1 Framework Layer

• Next.js 15.3 with App Router and Server Actions

3.2 UI Layer

• React 19 with Concurrent rendering and Suspense support
• Tailwind CSS for utility-based layouts
• MUI (Material UI) for polished components

3.3 Data Access Layer

• Prisma ORM for type-safe schema and database access

3.4 Authentication Layer

• Supabase Auth for email and OAuth-based login

3.5 Database Layer

• Supabase (PostgreSQL) as a scalable cloud-native database

3.6 Deployment Layer

• Vercel for instant deploys with preview environments

3.7 Language

• TypeScript for static typing throughout the stack

4. User Flows

4.1 Authentication Flow

1. User logs in via Supabase (email or OAuth)
2. Session is stored and retrieved on the server
3. Middleware validates user's role and permission
4. User is redirected to appropriate dashboard based on role

4.2 Data Management Flow

1. Server Actions are triggered via form or component interactions
2. Data is fetched or mutated using Prisma
3. UI updates with React 19 and Server Components
4. This enables secure, real-time, full-stack interactivity without a traditional REST or GraphQL API

4.3 Subscription Management Flow

1. User selects a subscription plan
2. Payment information is collected and processed
3. Subscription status is updated in the database
4. User access is adjusted based on the new subscription tier

5. Non-Functional Requirements

5.1 Performance

• Page load time under 1.5 seconds for initial load
• Sub-second response for authenticated interactions
• Support for 10,000+ concurrent users on standard deployment

5.2 Security

• OWASP Top 10 compliance
• Regular security audits and updates
• Data encryption at rest and in transit
• Compliance with GDPR, CCPA, and other relevant regulations

5.3 Scalability

• Horizontal scaling capabilities
• Database performance optimization
• Resource-efficient implementation

5.4 Reliability

• 99.9% uptime target
• Automated backup and recovery procedures
• Graceful degradation under load

5.5 Maintainability

• Comprehensive documentation
• Consistent coding standards
• Test coverage (unit, integration, and end-to-end)

6. Implementation Phases

6.1 Phase 1: Core Framework

• Basic Next.js + React setup
• Prisma and Supabase integration
• Authentication foundation
• Project structure and conventions

6.2 Phase 2: Essential Features

• User and role management
• Multi-tenancy implementation
• Dashboard and settings pages
• Basic subscription capabilities

6.3 Phase 3: Advanced Features

• Advanced subscription and billing
• Analytics and reporting
• Team collaboration features
• Customization capabilities

6.4 Phase 4: Enterprise Extensions

• SSO integration
• Advanced security features
• Compliance tooling
• Enterprise-grade support

7. Success Metrics

7.1 Developer Adoption

• Number of repositories using SaaSKit
• GitHub stars and forks
• Community contributions

7.2 Development Efficiency

• Time saved in SaaS application development
• Reduction in boilerplate code
• Faster time-to-market for SaaS products

7.3 Product Quality

• Reduction in common security vulnerabilities
• Improved performance benchmarks
• Enhanced user experience ratings

8. Conclusion

SaaSKit is designed to revolutionize the way developers build SaaS applications by providing a comprehensive, secure, and scalable foundation. By addressing the common challenges in SaaS development, SaaSKit enables developers to focus on creating unique value for their users while leveraging best practices in modern web development.

This PRD outlines the key requirements and specifications for SaaSKit, providing a roadmap for development and a reference for stakeholders. As the product evolves, this document will be updated to reflect new features, technologies, and best practices.