We are looking for an experienced Full-Stack Developer or Brazilian integration company to build a complete middleware solution connecting: InteratiX (Brazil WhatsApp automation platform) Website: https://interatix.com.br SIGEP WebService – Correios Brazil (SOAP/WSDL) Website: https://www.correios.com.br ClippStore ERP (Brazil) Website: https://clipp.com.br/clippstore WhatsApp Business API (Brazilian providers) 360Dialog BR → https://www.360dialog.com Z-API Brazil → https://www.z-api.io Gupshup BR → https://www.gupshup.io This job requires real experience with: SOAP (mandatory), REST APIs, SQL, WhatsApp API, Node.js or Python, Brazilian systems integration. OBJECTIVE Build a backend middleware that: Receives messages from InteratiX (WhatsApp) Uses AI to understand user intent (OpenAI or similar) Queries ClippStore DB for products, stock, dimensions, prices Calculates shipping via SIGEP Correios (SOAP) Generates shipping labels (PDF/Base64) Creates orders inside ClippStore Sends label & tracking automatically to the customer via WhatsApp Pushes leads/orders into a Brazilian CRM (Agendor, Moskit, RD Station, Pipedrive) Retrieves tracking updates from Correios and notifies customers SCOPE OF WORK The developer must deliver a complete and functional integration, including: 1. Webhooks WhatsApp → InteratiX → Middleware Payment confirmation → Middleware Tracking events → Middleware → WhatsApp bot for more information check file attached