Can I vibe code Sendlane?

Build an open-source, lightweight email and SMS marketing automation system tailored for Shopify using Node.js (TypeScript), PostgreSQL, Redis, and React.

1. SYSTEM ARCHITECTURE & DATA MODEL
- Database Entities: Create schema for Contacts (email, phone, consent_email, consent_sms, properties JSONB), Lists, Segment (definition rules JSONB), Flows (workflow state), FlowNodes (trigger, delay, condition, action), Campaigns, EmailTemplates, SMSMessage, and MessageLogs.
- Webhook Ingestion: Build an API endpoint `/api/webhooks/shopify` that accepts order creation, checkout update, and customer creation events. Store incoming events in a Redis queue (BullMQ).

2. AUTOMATION ENGINE & QUEUE PROCESSING
- Workflow Processor: Implement a state machine processor using BullMQ that processes queue jobs for Flow execution.
- Node Types: Implement 'Trigger' (e.g., checkout_abandoned), 'Delay' (e.g., wait 2 hours), 'Condition' (check if customer ordered in last 24h), and 'Action' (send_email, send_sms).
- Execution Engine: Maintain state for active contacts in a flow. When a delay node is reached, delay execution using Redis scheduled jobs.

3. INTEGRATIONS & DELIVERY PIPELINE
- Email Provider: Integrate with SendGrid or Postmark API for outbound rendering. Render LiquidJS template variables using Contact and Webhook context.
- SMS Provider: Integrate with Twilio API for SMS. Validate phone numbers using E.164 formatting before dispatch.
- Unsubscribe Sync: Create a public `/unsubscribe` endpoint that toggles `consent_email` or `consent_sms` to false and immediately suppresses future flow steps.

4. DASHBOARD UI
- Build a Next.js administrative dashboard using React Flow to graphically configure flow nodes.
- Include a rich HTML template builder using Unlayer or a basic Monaco HTML editor with variable placeholders.
- Provide a Real-Time Subscriber view showing campaign performance metrics (sent, opened, clicked, unsubscribed).

5. EDGE CASES & SAFETY SAFEGUARDS
- Legal Compliance Checks: Before calling Twilio or SendGrid APIs, perform explicit DB validation: never dispatch SMS if `consent_sms` is false or if the sending time falls outside TCPA quiet hours (8 PM - 9 AM recipient local time).
- Bounce & Spam Handling: Implement dynamic webhook handlers for SendGrid drop/bounce/complaint webhooks to automatically mark contact state as bounced or suppressed.

6. OUT OF SCOPE
- Do not build custom SMTP server software. Leverage established delivery platforms (SendGrid/Postmark/Twilio) for delivery layer execution.

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