Senior Full-Stack Engineer (AI + SaaS Automation) – Build an AI-Powered Real Estate Operating System

UpworkUSNot specifiedexpertScore: 67
AI Agent DevelopmentAI BotAPI DevelopmentChatGPT API IntegrationNode.jsPythonArtificial IntelligenceJavaScriptAPI
We are building WholesaleOS™, a fully automated AI-powered real estate wholesaling operating system. This is not a basic CRM automation job. We are building: AI Lead Manager Agent AI Acquisitions Agent AI Follow-Up Agent Voice AI integration SMS AI orchestration Dual pipeline CRM (Acquisition + Disposition) Marketing attribution engine Real-time KPI command center dashboard GHL + Twilio + Meta integrations The goal is to create a near fully autonomous operation powered by AI agents with deterministic business rules and complete analytics visibility. This is essentially building a vertical SaaS product for internal use. Scope of Work You will design and build the core middleware + analytics engine that connects: • OpenAI API (agent-style orchestration) • Twilio (SMS + Voice) • Meta Lead Ads (Facebook) • GoHighLevel CRM (API sync) • PostgreSQL database • Custom KPI dashboard (React / Next.js) Core Responsibilities • Architect multi-agent AI workflow system • Build webhook handling system for SMS + FB leads • Implement structured tool-calling logic • Design deterministic business rule engine • Build dual pipeline tracking (Acquisition + Disposition) • Create marketing attribution + ROI engine • Build real-time KPI dashboard • Design database schema for scalable analytics • Implement logging + monitoring system • Optimize token usage and AI cost Required Technical Skills Must Have: • Strong Node.js OR Python backend experience • PostgreSQL database design experience • Experience building SaaS dashboards • API integrations (REST/webhooks) • Experience with OpenAI API or similar LLM APIs • Experience deploying to AWS / Vercel / Railway / similar Strong Plus: • Conversational AI systems • Twilio integration • CRM integrations • Event-driven architecture • Data aggregation / KPI computation systems • Experience designing scalable products How to Apply To be considered, include: Links to SaaS or dashboard systems you’ve built Description of a multi-system API integration you’ve designed Explanation of how you would architect a real-time KPI aggregation engine Your preferred stack and why Estimated timeline for completion Bonus Question (Important) How would you: • Prevent an AI agent from executing actions outside defined business rules? • Design a system that can scale to 50,000+ leads? • Attribute revenue accurately to marketing channels?
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