MoneyLens
A personal finance app in production that reads PDF statements, forecasts the month's spending with PyTorch and warns before a limit is exceeded.
- Python
- FastAPI
- PostgreSQL
- React
- TypeScript
Hi! I'mJoão Paulo
Full Stack Developer
I build web applications end to end, with a focus on the back-end: Python FastAPI React PyTorch. I created MoneyLens, a personal finance app in production.
I'm looking for my next role as a full stack developer.
Projects
Next project in progress
A new idea is getting off the ground. Coming soon.
About me
I'm a full stack developer based in Maceió, Brazil, focused on Python back-ends. I'm in the last semester of a Systems Analysis and Development degree at Estácio, expected to finish in December 2026.
As a freelancer at Salescope, I built the Bling and Mercado Livre integrations and the pipeline that audits the shipping, commission and fees of every sale, using FastAPI, PostgreSQL and React.
On my own, I built MoneyLens: a personal finance app in production, used by several people, that reads PDF statements, forecasts the month's spending with PyTorch and has more than 700 automated tests.
Day to day
- Back-end and data
- Python · FastAPI · SQLAlchemy · Alembic · Node.js · REST APIs · OAuth 2.0 · third-party API integrations · PostgreSQL · MySQL · data modeling · Object-Oriented Programming · Master/Detail architecture
- Front-end
- HTML · CSS · JavaScript · TypeScript · React · TanStack Query and Router · Tailwind CSS
- Machine learning
- PyTorch · ONNX Runtime
- Testing and tools
- Pytest · Vitest · Playwright · Git · GitHub · GitHub Actions · uv
- Deploy and cloud
- Docker · Caddy · Render · Cloudflare Workers · Supabase
Experience and education
Salescope
Feb/2026 – Jun/2026
Full Stack Developer
Freelance · Remote
- Multi-tenant SaaS platform that audits marketplace sales: FastAPI and PostgreSQL back-end, Python extraction worker and React + TypeScript front-end, deployed with Docker and Caddy.
- Integrations with the Bling and Mercado Livre APIs using OAuth 2.0 (PKCE and state validation). Author of 7 of the 14 back-end endpoints and 7 of the 18 tables, plus all Alembic migrations.
- Audit pipeline that checks shipping, commission, fees, discounts and bonuses of each order against the Mercado Livre calculation engine and flags discrepancies, with a 30-day sync window.
- Resilient consumption of external APIs, with exponential backoff retries and HTTP 429 rate-limit handling.
Universidade Estácio de Sá
Jul/2024 – Dec/2026
Technologist Degree in Systems Analysis and Development
Expected completion: Dec/2026
Contact
Want to talk about a role or a project? Drop me a line.