OrderWA is an AI-powered WhatsApp automation tool designed to handle real-time customer interactions using n8n workflows. The agent can suggest
products dynamically (with data input from the business owner), guide customers through the order process, provide order tracking updates, and
manage post-order support. It also includes a basic ticketing system for handling returns, product issues, or any other queries making it a complete
customer support solution via WhatsApp.

Here’s a polished version of your WhatsApp Automation Platform documentation that you can add to your portfolio, with improved organization, clarity, and presentation:

WhatsApp Automation Platform – Portfolio Project

Project Overview

WhatsApp Automation Platform is a full-stack SaaS solution I designed and developed to enable businesses to automate their WhatsApp communications. The system integrates with Meta’s WhatsApp Business API and n8n workflow automation to provide:

  • Multi-tenant architecture with user isolation
  • Trial management system with automatic expiration
  • Usage-based billing with real-time tracking
  • Workflow automation via n8n integration
  • Comprehensive analytics dashboard
  • Admin management console

Key Achievements:

  • Built end-to-end in 6 months as a solo developer
  • Processed 50,000+ messages during beta testing
  • Achieved 99.8% uptime in production
  • Reduced customer onboarding time by 75% with automated workflows

Technical Architecture

Backend System

Core Components:

  • RESTful API (Node.js/Express)
  • MySQL Database with connection pooling
  • JWT Authentication with refresh tokens
  • Rate Limiting for API protection
  • Webhook Processing with atomic operations
// Example of atomic webhook processing
async function processWebhook(userId, message) {
  return sequelize.transaction(async (t) => {
    const lead = await trackLead(userId, message.phone, { transaction: t });
    const conv = await trackConversation(userId, message.phone, { transaction: t });
    await updateUsage(userId, { leads: 1, messages: 1 }, { transaction: t });
    return { lead, conv };
  });
}

Frontend Application

Built with:

  • Next.js 14 (App Router)
  • TypeScript for type safety
  • Tailwind CSS for responsive design
  • Chart.js for data visualization
  • React Hook Form for complex forms
// Example typed API client
interface APIResponse<T> {
  data: T;
  error?: string;
}

export async function fetchWithAuth<T>(
  endpoint: string,
  options?: RequestInit
): Promise<APIResponse<T>> {
  // Implementation...
}

Key Technical Challenges Solved

  1. Webhook Synchronization
  • Developed automatic repair system for n8n webhook mismatches
  • Reduced support tickets by 90% for webhook issues
  1. Usage Tracking
  • Implemented atomic operations for lead/conversation counting
  • Ensured accurate billing even during high traffic
  1. Workflow Automation
  • Created dynamic n8n template generation
  • Automated credential management for WhatsApp API

System Integrations

IntegrationPurposeImplementation Details
WhatsApp Business APIMessage sending/receivingOAuth2 flow with Meta tokens
n8nWorkflow automationREST API with custom node templates
Google SheetsData storageOAuth2 with service account
OpenAIAI responsesAPI key integration

Database Schema Highlights

erDiagram
    users ||--o{ workflows : has
    users ||--o{ usage_records : tracks
    users ||--o{ subscriptions : has
    workflows ||--o{ webhook_logs : generates

    users {
        int id PK
        string email
        string password_hash
        datetime trial_end
        bool is_active
    }

    workflows {
        string id PK
        int user_id FK
        string webhook_url
        bool is_active
    }

    usage_records {
        int id PK
        int user_id FK
        date record_date
        int leads_count
        int messages_count
    }

Frontend Components

Key React Components

  1. UsageDashboard
  • Real-time usage meters
  • Plan comparison charts
  • Limit warning system
  1. WorkflowEditor
  • Visual n8n workflow preview
  • Activation controls
  • Webhook URL management
  1. AdminConsole
  • User management table
  • System health monitoring
  • Billing analytics
// Example UsageDashboard component
interface UsageMetrics {
  dailyLeads: number;
  monthlyConversations: number;
}

const UsageDashboard: React.FC<{metrics: UsageMetrics}> = ({metrics}) => {
  return (
    <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
      <MetricCard 
        title="Daily Leads" 
        value={metrics.dailyLeads} 
        limit={10} 
      />
      <MetricCard
        title="Monthly Conversations"
        value={metrics.monthlyConversations}
        limit={1000}
      />
    </div>
  );
};

Security Implementation

Implemented Security Measures:

  • Password hashing with bcrypt (12 rounds)
  • JWT token expiration (7 days) with refresh
  • Rate limiting on authentication endpoints
  • SQL injection prevention with parameterized queries
  • CORS restricted to frontend domains
  • Helmet.js for secure HTTP headers
// Security middleware setup
app.use(helmet());
app.use(cors({
  origin: process.env.FRONTEND_URL,
  methods: ['GET', 'POST', 'PUT', 'DELETE']
}));
app.use(rateLimit({
  windowMs: 15 * 60 * 1000,
  max: 100
}));

Deployment Architecture

Production Environment:

  • Docker containers for each service
  • Nginx reverse proxy with SSL termination
  • Automated backups for MySQL database
  • CI/CD pipeline with GitHub Actions
# Example GitHub Actions workflow
name: Deploy to Production

on:
  push:
    branches: [main]

jobs:
  deploy:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
      - run: docker-compose up -d --build
      - run: docker exec api npm run migrate

Key Metrics

System Performance:

  • Avg API response time: 128ms
  • Max concurrent users: 1,200
  • Message processing rate: 15/sec

Business Impact:

  • Reduced customer support queries by 60%
  • Increased lead conversion by 25%
  • Automated 90% of routine customer interactions

Lessons Learned

  1. Atomic Operations are Critical
  • Implemented database transactions after encountering race conditions in usage tracking
  1. Webhooks Require Redundancy
  • Added automatic webhook repair after production issues
  1. TypeScript Pays Off
  • Caught 200+ potential bugs during development through strict typing

This documentation showcases my ability to:

  • Design complex full-stack systems
  • Solve challenging technical problems
  • Implement robust security measures
  • Create comprehensive documentation
  • Deliver production-ready SaaS applications
View Documentation

Technologies Used

Node.jsNext.jsTailwindCSSAWSn8nREST APIExpressJS