Allan Sales's Work | ContraWork by Allan SalesAllan Sales
AI engineer: WhatsApp AI agents, RAG and LLM apps
Management SaaS for glass shops and factories, live in production with real payments and WhatsApp notifications. B2B quoting platform for the glass industry. Technical-drawing API (SVG + 3D), an AI technical consultant, and photo analysis with vision models. 680 automated tests. WhatsApp AI assistant for a digital-health platform, answering with RAG over the platform's knowledge base (pgvector) and with risk detection. Also built LGPD-compliant auth, scheduling and split payments. 600+ automated tests. Multi-tenant WhatsApp CRM with an AI agent. Each company connects its own number through Embedded Signup. FastAPI + LangGraph, Postgres row-level security, HMAC-verified webhooks, templates and delivery status, encrypted token vault, passkey login.