01Financial calculators
Calculaderia
A collection of free calculators for everyday financial questions—from compound interest to loans and taxes. I built it to make useful answers quick and easy to find.
- ~300 monthly users
- 50+ useful tools
Engineer × Product builder × Founder
Engineering,
with product
judgment built in.
I've spent 13+ years taking products from the first customer conversation to reliable software running in production.
Full Stack Engineer at Shippo
5K → 3Mindexed pages
10K+customers from zero
+ $10Mannual revenue
37 → 0production incidents
Selected work
Things I've built.
A few products I've built for people to use for free. They range from financial tools and team collaboration to AI and computer vision.
02Team estimation tool
Planning Poker
A simple planning poker app for remote teams. Create a room, share the link, vote, and move on without turning estimation into another meeting about the tool.
- Real-time rooms
- Powered by WebSockets
03Review and publishing platform
Guia Melhor Review
A review site that helps people compare products without opening dozens of tabs. Behind it is a fully automated AI workflow for research, writing, and publishing.
~100 monthly users
04Computer-vision game
Ball Catcher
A browser game controlled by hand movements through the webcam. I built it as an experiment in computer vision, interaction design, and fast feedback.
Next.js · TypeScript · Hand tracking
05Open-source AI tool
PokéMCP
An open-source MCP server that lets AI assistants query PokéAPI v2. It is built in Python with FastMCP and designed to be easy to run locally.
Python · FastMCPExperience
Where I've made an impact.
I've worked as an engineer, product manager, and founder. These are some of the results I'm proudest of.
Started in the financial systems behind a global shipping platform, now building fulfillment services: pick, pack, print, and verify.
- Drove a critical workflow from 37 incidents to zero.
- Reduced invoice-save P99 latency by as much as 48.3%.
- Cut charge processing from 27.1s to 6.5s.
- Led the development of Click to Print.
Python · React · TypeScript · Go · PostgreSQL · Kafka · Kubernetes · Distributed systems
I led a three-engineer squad improving how practitioners build their websites, take payments, and get found.
- Raised website-builder NPS from 36 to 79.
- Reduced builder churn from 60%+ to under 10%.
- Improved checkout conversion by 21% and average cart value by 11%.
- Brought search latency from 20s to under 3s.
React · Ruby on Rails · Stripe · SEO
I worked on the marketplace growth initiatives, delivering strong results in SEO and organic traffic.
- Scaled indexed pages from 5K to 3M.
- Increased organic traffic by 65%.
- Reached 90%+ tracking quality across the funnel.
Next.js · TypeScript · Go · GCP · Kubernetes
As a product manager, I led seven engineers across growth, operations, and marketplace projects.
- Launched a new channel worth 15% of the company's annual revenue.
- Generated seven figures in new annual revenue.
- Reduced manual operations work by 66%.
- Cut bus-stop mapping delays by 50%.
Product strategy · Data · Growth · Team leadership
2019—2022
2S Nutrition
Founder & Software Engineer
I built a direct-to-consumer nutrition company, including the product, software, growth, and day-to-day operations.
- Grew to 10K+ paying customers.
- Built subscriptions and LTV-focused retention systems.
- Improved revenue per session by 47% through funnel work.
Company building · E-commerce · Growth · Payments · Analytics
2013—2019
Mr A Tech
Founder & Software Engineer
I started my career building custom software for clients and learned early to care about the business result, not just the code.
- Earned an NPS of 100 across client work.
- Used product experiments to improve ARPU by as much as 60%.
- Worked on several projects across frontend, infrastructure, databases, and integrations.
PHP · Node.js · React · Consulting
A bit about me
Engineer, product manager, founder.
I started out building software for clients, later founded an e-commerce company, spent two years as a product manager, and then returned to engineering. That mix helps me connect technical decisions with what users and businesses actually need.
I studied Mechanical Engineering at ITA and have spent most of my career in small, fast-moving teams, usually working close to the problem and the people affected by it.
Focus on the result
Before deciding what to build, I want to understand what should change for the user or the business.
Keep it simple
Good software should be easy for the next person to reason about, operate, and change.
Iterate quickly
Talk to users, read the data, and check production. Assumptions get better when they meet reality.
Elsewhere
Find me online.
LinkedIn has my full work history. GitHub has the code.