Caio D.

I build AI systems that move real money and reach real users - not demos. I led the OpenAI × Arco Educação partnership (featured on OpenAI website), shipping GPT-based tools that are scaling from 50 to 600 schools and ~70,000 students across Brazil. Before that, I was a quant at Garde Asset Management generating +5 percentage points of alpha over benchmark across FX, interest rates, and equity index strategies - and the first data scientist at McKinsey's QuantumBlack Latin America, where I stood up the practice across Brazil, Argentina, and Chile with leading banks and insurers. What you get when you hire me: • LLM integration & agents that survive production - OpenAI, Anthropic, LangChain / LangGraph, RAG, evals, and cost-controlled model mixes. At Arco, I shipped a system that fine-tunes GPT‑4o mini and GPT‑3.5 to keep quality high while cutting inference cost at 70k-student scale. • Quant & financial modeling - backtesting, alpha research, broker integrations (IBKR and similar), strategy audits for lookahead bias, overfitting, and survivorship. Hedge-fund-grade work, not retail indicator bots. • AI architecture review for non-technical founders and solo builders - the fastest way to de-risk a Claude Code-generated codebase before real users or real financial data hit it. I've scaled engineering orgs from 30 to 130 people; I know what breaks. Stack: Python, Typescript, OpenAI & Anthropic SDKs, LangChain / LangGraph, vector DBs, FastAPI, PostgreSQL, BigQuery, GCP / Firebase, Docker. Full-stack when the project needs it. Background: Ex-McKinsey / QuantumBlack (Senior DS, first in LatAm). Ex-Garde Asset Management (Principal DS, hedge fund). Ex-Shape Digital (Director of Software & Data, founding member of a McKinsey & Modec spin-off, scaled 30→130). Ex-Arco Educação (Director of AI - led the OpenAI partnership). Currently building my own AI startup, Aizen, fully hands-on. Native Portuguese, bilingual English, work US business hours from Brazil. I'm new to Upwork and investing the first few weeks in doing excellent work at a friendly rate to build reviews. Rates will climb after that. If you're considering a serious AI or fintech build, send me the shortest version of your problem and what "done" looks like - I'll respond within a few hours with a concrete approach and an honest yes/no on fit.