Case study

Investment Calculator.

A Brazilian investment simulator with compound interest, product comparison and real-time market data — no backend.

The problem

Fifteen years of cash-flow management taught me that compound interest decides every plan — yet most calculators hide the assumptions behind the math.

What I built

A Brazilian investment simulator: compound interest with monthly contributions, product comparison, goal planning and real-time market data (B3, crypto, FX) — all in the browser, no backend.

Stack

React
TypeScript
Vite

What I learned

Numeric precision in JavaScript, public API consumption and a serverless front-end architecture.