N8n / Ai Automation Developer for Pos and Payments Integration

We are Intevolabs, an ai automation agency, seeking an experienced n8n and api integration developer for a critical client project in the restaurant sector. The primary goal is to connect a WhatsApp conversational AI agent to their point-of-sale system.

Project Scope:
- Extend an existing n8n-based WhatsApp conversational bot.
- Integrate with Oracle MICROS Simphony (STSG2 API, OAuth2/PKCE authentication) to push orders directly into the point-of-sale system.
- Implement payment link generation via PowerTranz (Hosted Payment Page) and handle the confirmation callback.
- Integrate with Braze (CRM) for purchase events and marketing.

This project involves considerable transaction volume across multiple locations and requires robust error handling; it is not a prototype. We are looking for a professional with verifiable production experience in n8n, not just simple automations. The ideal candidate will have a proven track record in pos, payment, or enterprise system integrations via rest apis and a strong understanding of oauth2 and real-world api authentication. Examples of past relevant work are highly valued.

This is a remote, project-based engagement, with the scope to be finalized. There is a possibility of an ongoing monthly support/maintenance contract after the initial launch.