Data/ML Engineer at Lexter, building AI for Brazilian social-security law. Fortaleza, CE 🇧🇷

I work at the seam between the model and the product: a prediction has to be well calibrated and it has to survive contact with production.

• Case outcome prediction — models that estimate the probability of success for social-security benefit claims (BPC/LOAS), from training to serving: XGBoost, Optuna, SHAP, probability calibration, drift monitoring, and CI gates that stop a bad model before it reaches production.
• Legal document pipelines — turning court records (PJE) and medical reports into structured features at scale: crawling, LLM extraction, evaluation rubrics, and the data lake underneath.
• LLM agents that get graded — a medical-examination interview simulator, plus the automated evaluators and eval harnesses that keep it honest.
• On the side — freelance work on real-time voice agents: speech pipelines, configuration tracking, and metrics for conversations you can't unit-test.

• Languages — Python · TypeScript · SQL
• ML — scikit-learn · XGBoost · SHAP · Optuna · pandas · probability calibration, drift monitoring
• LLM — LiteLLM · Claude / Anthropic API · MCP · RAG over pgvector · structured extraction · eval harnesses and LLM-as-judge · Langfuse
• Voice agents — LiveKit Agents · Deepgram · ElevenLabs / Cartesia · Silero VAD · turn detection
• Backend & infra — FastAPI · PostgreSQL · GCP (Cloud Run, BigQuery, GCS) · Terraform · Docker

• Nihongo Cards — a Japanese flashcard PWA with FSRS-6 spaced repetition, offline-first, built because I wanted a better way to study kanji.
• gym-hero — a reinforcement learning environment based on Guitar Hero.
• Boteco Survivors — a bullet-heaven game set in a Brazilian bar, playable in the browser (source). TypeScript and Canvas, no runtime dependencies. Games are still the reason I got into any of this.

M.Sc. in Computer Science (Federal University of Ceará, 2024) — multimodal deep reinforcement learning: agents that learn to act from both what they see and what they hear.

B.Sc. in Computer Engineering (UFC, 2021).

_{Most of what I build these days lives in private repos, so the graph below undersells it.}