Product Analyst · Indices · B3

Hi, I'm Caio Ruiz.

Computer engineer with a background in software and data engineering, passionate about technology and investing.

About

I'm a Product Analyst at B3, where I research and develop stock indices (broad and sectoral), commodity indices and currency indices, write methodologies, run backtests in Python and work with clients who request custom indices.

Outside of work, I like building small, useful products, which you'll find below.

Areas: Indices, stocks, stock derivatives, commodities and currencies, ETFs, AI products
Tools: Python, SQL, Databricks, AWS
Education: B.Sc. in Computer Engineering, Faculdade Engenheiro Salvador Arena (2019–2024)
Languages: Portuguese, English and Spanish

Projects

Focus over time

Live

Market expectations, week by week.

The Central Bank’s Focus survey only shows this week’s market expectations. This site shows how each forecast for inflation, the Selic rate, GDP and the dollar changed since the first projection, compared with what actually happened. The site is in Portuguese.

Data: Central Bank expectations API since 2012, updated every business day
Charts: median, lowest and highest forecast and the realized value for each year

focus.caioruiz.com →

Brazil macro dashboard

Live

The main indicators of the Brazilian economy in one place.

Selic, CDI, IPCA, real interest rate and the dollar, with Central Bank of Brazil data updated every business day. Each indicator shows the math behind it and its source series.

Charts: 1, 2 or 5 years, with each day's value on hover
Data: a table with month-end values

caioruiz.com/en/macro →

Calcula Lab

Live

Calculators that show the math, not just the result.

Practical calculators for two niches: homelab and baking. You enter your own numbers and each calculator shows the formula and assumptions behind the result. No sign-up, no cookies and nothing to sell. The site is in Portuguese.

Homelab: 24/7 power cost, UPS sizing, usable RAID/RAIDZ/SHR capacity, storage for security cameras (DVR/NVR), home server vs. cloud
Baking: cake and pastry pricing (cost per gram, labor and margin)

calculalab.com.br →

Ruiz App Store

Open source

An app store for Umbrel, the home server OS.

A community app store for umbrelOS with apps I built. Add the repository URL in Umbrel and install any of them with one click.

Claude Server: runs Claude Code on your server and lets you drive it from a browser on any device. Sessions keep running when you disconnect, like tmux on the web
Gitea Runner: a self-hosted CI/CD runner for Gitea Actions, with multiple instances, start/stop and live logs from a web UI

github.com/CaioRuizz/ruiz-app-store →

Painel ETF

In development

A research platform for ETFs listed on B3.

Brings together prices since 2018, holdings, distributions, costs and data from the Central Bank of Brazil, the National Treasury, CVM and the SEC to answer questions like: how much do two ETFs overlap? Which ETFs hold a given stock? What are the risk, return and cost of each one?

Data: scheduled daily ingestion, backups with tested restores and alerting
Analytics: overlap by asset, issuer and look-through, Stock Locator, return, risk, correlation, aggregated fundamentals and costs

Data Analytics API Frontend Portfolios Production

Non-commercial portfolio project. Not investment advice.

Up next

Copom statements

Each Copom statement compared word by word with the previous one, plus a timeline of rate decisions.
Super Wednesday

Copom and the Fed side by side: decisions, statement changes and a countdown to the next meetings.
Inflation by item

What rose and fell the most in each IPCA release, with data from IBGE.

Contact

Up for a coffee? Send me a message.