Selected work — open source, professional and side projects.
Multi-tenant analytics platform for fitness businesses — pilot tenant: my own two studios. A production lakehouse (Databricks · dbt · Airflow 3 · Postgres RLS · Superset) under a €100/month ceiling, built AI-first with Claude Code agents.
Dissatisfied with the SaaS running my studios, I built a complete management platform from scratch — bookings, billing (month-close, VAT to the cent), MB Way/Multibanco payments, member management. Claude compressed a ~1-year project into ~3 months.
Modernized a mission-critical Customer Master Data monolith into Java/Spring microservices via the strangler pattern, while migrating from OpenShift to AWS EKS. Zero ticket from legacy consumers.
Solo-built (in Python) a full automation stack for an 80+ engineer release program: Control-M orchestration, Jira/Confluence integrations, paramiko-based Linux ops, Sybase QA framework.
End-to-end platform combining web, back-end, ETL, and cross-API automations — FastAPI + Pydantic v2 backend, React front-end, AWS Lambda pipelines, OpenAI + Claude Code + Sora, LinkedIn/YouTube/Gmail APIs.
Production voice agent on real phone numbers for two pilates studios — Vapi + Vonage + OpenAI. Schedules, reschedules, takes intake, escalates to human.
Production email agent that reads/replies via Gmail IMAP/SMTP, classifies intent, drafts replies, and pulls context from internal data.
Three-subdomain Wagtail site (www / tech / books) on AWS Lightsail. Bilingual EN/PT content with AI-driven translation and summarisation, search, RSS feeds, SEO, and Giscus comments — all from one Django project.
Unofficial Python SDK for the eupago Portuguese payment gateway: Multibanco, MB WAY, Credit Card, Apple Pay, Google Pay. OSS-pattern with pyproject.toml, mkdocs site, pre-commit hooks, CHANGELOG, examples, SECURITY policy.
Unofficial Python SDK for the Vendus Portuguese e-invoicing API. Same OSS-pattern structure as eupago-python.
Production-grade Django Admin reference implementation on AWS: EC2 + RDS Postgres + S3 + Lambda power panel (start/stop with state machine) + full audit trail + 100-test smoke suite. Target cost: ~US$15/month for a complete back-office.
Reference-grade, fully asynchronous Books REST API — twin of FlaskProject for side-by-side benchmark. 71 tests passing, 100% coverage, <1s run time, zero self-mocks.
Reference Flask + SQLAlchemy + Postgres + Alembic implementation of a Books CRUD API. Clean separation: routes / repository / models. OpenAPI docs, tests, Docker. Sync edition of FastAPIProject for benchmark.
Node.js engine for parsing fixed-width text files with hierarchical line types (parent/child) and persisting to Postgres (Sequelize) or MongoDB (Mongoose).
Long-running personal repo of code recipes, snippets and experiments — AWS, Python, Django, integrations.
A small library that auto-exposes Django QuerySet API via GET/querystring of all models in a project — REST-like format, zero config.
Django application to manage beauty salons and hair salons — appointments, services, customers.
A simple Arduino gadget to control the Coding Dojo timebox.
Google Summer of Code 2008 contribution to FreeBSD — TCP test tooling. Public reference at wiki.freebsd.org/SummerOfCode2008.
Sistema de Gestão Unificado de Igrejas — Django app to administer church operations.