Senior AI Backend Engineer - Multi-Agent State Architecture (LangGraph + Business Central ERP)

Title: Senior AI Backend Engineer - Multi-Agent State Architecture (LangGraph + Business Central ERP) Project Overview: We are deploying a production-ready, multi-agent AI framework to automate four core operational SOPs across sales, logistics, and collections. The system needs to orchestrate structured, long-term multi-day workflows, make real-time API pricing decisions, and handle complex inbound call routing based on ERP account status. Required Tech Stack: - Python (FastAPI, Pydantic) - LangGraph / LangChain State Management - Microsoft Dynamics 365 Business Central REST API (OData) - Celery / Redis (Asynchronous background task clocks) - Aloware CRM / Twilio SMS / SendGrid Email - ElevenLabs / Claude Voice API integration Project Timeline: Strict 45-day deadline to production launch. Milestone-based escrow payments matching a 4-phase rollout structure. What You Will Do: 1. Construct a resilient, state-driven workflow graph managing communications across 3 custom agents. 2. Develop a runtime pricing calculation router drawing live inventory costs directly from Business Central. 3. Establish background chron-tasks handling outreach tracking stretching across a 43-day timeline. 4. Implement Human-in-the-loop review guardrails for administrative pricing overrides. To Apply: Please submit a brief summary of a multi-agent state-machine system you built previously, detailing how you handled data state tracking and ERP/CRM integrations.