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Notes on what I learn while building software.

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Rinha de Backend 2026: Building a Fraud Detection API in 350MB

How IVF clustering, AVX2 assembly, and Go turned 13-second p99 into 2.47ms

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7 Things I Learned Building a Fraud Detection API for Rinha de Backend 2026

Lessons from 22 iterations, 5 phases, and 4 wasted submissions

Writing better prompts for AI agents

Prompt engineering patterns that work in production

Reproducible development environments with Docker

Reproducible dev environments with Docker

My journey from logistics to software engineering

From logistics to software engineering at 42 São Paulo