Architecture & Design Decisions

This document outlines the architectural patterns, design decisions, and technical philosophy behind the BugBounty KSP platform.

🏗️ System Overview

The BugBounty KSP platform is built as a modern, scalable application using a microservices-inspired architecture with the following key components:

┌─────────────────────────────────────────────────────────┐
│                     Frontend Layer                       │
│    (React + TypeScript + Component Library)             │
└────────────────────┬────────────────────────────────────┘
                     │
┌────────────────────▼────────────────────────────────────┐
│                   API Gateway                            │
│         (Express.js + Authentication)                    │
└───┬────────────┬────────────┬────────────┬──────────────┘
    │            │            │            │
┌───▼────┐  ┌───▼────┐  ┌───▼────┐  ┌───▼────┐
│ Bounty │  │  User  │  │Reports │  │ Admin  │
│Service │  │Service │  │Service │  │Service │
└───┬────┘  └───┬────┘  └───┬────┘  └───┬────┘
    │            │            │            │
    └────────────┴────────────┴────────────┘
                     │
    ┌────────────────▼────────────────┐
    │    PostgreSQL + Redis            │
    └──────────────────────────────────┘

External Integrations:
├── Discord Bot
├── n8n Workflows
└── Knowledge Graph Engine

🎯 Core Design Principles

1. Modularity & Separation of Concerns

Decision: Use a layered architecture with clear separation between presentation, business logic, and data layers.

Rationale:

Implementation:

src/
├── api/          # HTTP endpoints (Presentation)
├── services/     # Business logic (Domain)
├── models/       # Data access (Data)
└── utils/        # Shared utilities

2. API-First Design

Decision: RESTful API with OpenAPI specification.

Rationale:

Standards:

3. Component-Based Frontend

Decision: React with TypeScript and a custom component library.

Rationale:

Key Libraries:

🔧 Technology Stack

Backend

Frontend

Infrastructure

📊 Database Design

Key Entities

-- Users
Users
├── id (UUID)
├── email (UNIQUE)
├── password_hash
├── role (ENUM: admin, researcher, client)
└── created_at

-- Bounty Programs
BountyPrograms
├── id (UUID)
├── name
├── description
├── reward_range
├── scope
└── status (ENUM: active, paused, closed)

-- Vulnerability Reports
VulnerabilityReports
├── id (UUID)
├── program_id (FK)
├── researcher_id (FK)
├── title
├── severity (ENUM: critical, high, medium, low)
├── status (ENUM: new, triaged, accepted, resolved)
└── submitted_at

-- Knowledge Graph
KnowledgeNodes
├── id (UUID)
├── type (ENUM: concept, technique, tool)
├── title
├── content
└── relationships (JSONB)

Database Patterns

🔐 Security Architecture

Authentication & Authorization

Strategy: JWT-based authentication with role-based access control (RBAC).

// User Roles
enum Role {
  ADMIN = 'admin',           // Full system access
  CLIENT = 'client',         // Manage programs
  RESEARCHER = 'researcher', // Submit reports
  GUEST = 'guest'           // Read-only access
}

// Permission Model
interface Permission {
  resource: string;
  actions: ('create' | 'read' | 'update' | 'delete')[];
}

Security Measures

  1. Input Validation: Zod schemas for all inputs
  2. SQL Injection Prevention: Parameterized queries
  3. XSS Protection: Content Security Policy
  4. CSRF Protection: Token-based validation
  5. Rate Limiting: Prevent abuse
  6. Encryption: TLS/SSL in transit, bcrypt at rest

🔄 Integration Architecture

Discord Integration

Pattern: Event-driven architecture with webhooks.

n8n Workflows

Pattern: Webhook-triggered automation.

Knowledge Graph

Pattern: Graph database with REST API.

📈 Scalability Patterns

Horizontal Scaling

Caching Strategy

  1. Browser Cache: Static assets
  2. CDN: Media files
  3. Redis: Session data, API responses
  4. Database: Query result cache

Performance Optimization

🧪 Testing Strategy

Test Pyramid

       ┌────────┐
       │   E2E  │  (10%)
      ┌┴────────┴┐
      │Integration│ (30%)
     ┌┴───────────┴┐
     │    Unit      │ (60%)
     └──────────────┘

Unit Tests: 60% - Test individual functions/components
Integration Tests: 30% - Test service interactions
E2E Tests: 10% - Test critical user flows

🔄 Design Decision Records (ADR)

ADR-001: Use TypeScript

Status: Accepted
Decision: Use TypeScript for both frontend and backend
Rationale: Type safety, better IDE support, fewer runtime errors

ADR-002: Monorepo vs Multi-repo

Status: Accepted
Decision: Multi-repo approach with separate repositories
Rationale: Better access control, independent versioning, clearer boundaries

ADR-003: REST vs GraphQL

Status: Accepted
Decision: REST API with optional GraphQL for knowledge graph
Rationale: Simpler to implement, well-understood, sufficient for most use cases

ADR-004: Docker Deployment

Status: Accepted
Decision: Containerize all services with Docker
Rationale: Consistent environments, easier deployment, portable

📚 Further Reading

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