Portfolio signal

Brazil / backend product systems / PT-BR native / English-first portfolio

Open to software engineering roles

Work

Six systems that hold up under technical scrutiny.

Three are public repositories with runnable engineering proof. Three stay private, but the cases still show architecture, constraints, operating flows, and why the system was shaped the way it was.

Public repositories with runnable proof

These are the repos I am comfortable putting in front of a recruiter or another engineer first: each one has a clean scope, technical evidence, and a repo surface worth inspecting.

01

OnboardPulse

A multi-tenant onboarding SaaS with billing, follow-up automation, storage controls, and product-like operational docs.

This project shows that I can work beyond CRUD: tenant isolation, budgeted AI usage, billing webhooks, storage policy, and cron-driven follow-ups.

  • Next.js
  • TypeScript
  • Prisma
  • PostgreSQL
  • NextAuth
  • Mercado Pago
Read case studyRepository
02

MailSieve

A lightweight signup risk API with OpenAPI contract, key management workflow, rate limits, and deploy verification scripts.

MailSieve is a good example of a small API product where contract clarity, ops scripts, and monetization readiness matter more than feature count.

  • Node.js
  • Express
  • TypeScript
  • OpenAPI
  • Docker Compose
Read case studyRepository
03

Neural Network From Scratch

An educational neural network implementation with deterministic evaluation, logs, tests, and a reproducible pipeline.

This stays public because it shows engineering discipline inside a study project: reproducible evaluation, smoke checks, and structured docs.

  • Python
  • NumPy
  • pytest
  • JSONL logs
Read case studyRepository

Private case studies with enough public explanation

These systems stay closed for now, but the cases still document the important parts: workflow shape, trust boundaries, operator concerns, and the trade-offs behind the product.

04

VOWGRID

A private case study for an agent-trust platform with simulation, policy evaluation, approvals, execution receipts, and rollback visibility.

The core signal is not just AI orchestration. It is the trust layer around execution: propose, simulate, evaluate, approve, execute, receipt, and rollback visibility.

  • Fastify
  • Next.js
  • Prisma
  • BullMQ
  • Redis
  • Zod
Read case studyRepo stays private
05

AcessoQR

A private case study for collaborative accessibility audits, QR-linked public certificates, and evidence-driven scoring.

This is the private project with the clearest public-interest angle: weighted checklists, evidence capture, moderation, and a public certificate layer.

  • Next.js
  • Supabase
  • PostgreSQL
  • RLS
  • QR Code
Read case studyRepo stays private
06

ORCEI

A private case study for quote generation and WhatsApp-based sharing, built as a mobile-first SaaS workflow on Next.js and Supabase.

The strongest signal here is product workflow design: quotes, public share links, mobile-first UX, and AI-assisted copy in a small but real business flow.

  • Next.js
  • Supabase
  • PostgreSQL
  • OpenAI
  • PWA
Read case studyRepo stays private