Described by the role I held rather than the code I wrote. Some I led teams through, some I built myself, roughly newest first.
5 selected works
A social project with no revenue: free, illustrated short courses on Brazil's history, politics and Constitution that keep working offline once downloaded. Live on the App Store, with Android on the way. Native apps read their content from a Cloudflare back end, and the lessons are versioned, sourced and published without an app update.
Designed and ran the adoption program for teams on critical projects, from the guardrails that define safe use to the training curriculum and the model for managing day-to-day usage. I measured the gains, and they showed a clear return.
Technical direction of the whole portfolio serving municipal and state services, reaching millions of people a month. I set the architecture, the standards and the delivery priorities across the teams building it.
Platform for corporate agents built on a single thesis: measurement is what makes cost optimization safe, because every saving, a smaller model, a cache, less context, is a bet that quality held. The agent loop runs end to end with streaming, tool calls and full tracing, durable runs on Temporal, and a deterministic provider that keeps it testable in CI without network.
Reads the transactional database, materializes flat tables in Parquet and answers questions in plain Portuguese about them, using text-to-SQL rather than RAG, because the questions are analytical and embeddings over rows miss counts and filters. Business rules live in SQL, not in the model, so the answer is the same every day and can be justified to a school, and it's now becoming a multi-tenant product.
Go, React, Postgres, Terraform and AWS
Infrastructure and applications provisioned through Terraform from a console instead of a shell, with encrypted credentials and an audit trail.
Ruby on Rails, PostGIS, Elasticsearch, Sidekiq and Google Maps API
Includes the scoring engine that weighs questionnaire answers and geolocation to place each student. Addresses are geocoded and ranked by real route distance, spatial data lives in PostGIS, and allocation runs as batched background jobs in successive passes with configurable radius rules.
.NET Core, React and Azure DevOps
Architecture and roadmap across backend, frontend and infrastructure, including the SAP and Salesforce integrations.