Writing

Writing & Notes

AI, software architecture, products, engineering life, and whatever has been occupying my brain lately.

Galpão IA: a place to build, ask and share

An AI community in Serra Gaúcha to explore new technologies, share practical knowledge and help people find a starting point.

Nov 11, 20263 min read

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Conceptual illustration of developers sharing laptops and chimarrão in a wooden galpão, with araucaria trees and the hills of Serra Gaúcha in the background.

Browse by category, or page through the archive below.

A simplified trace of one WhatsApp turn. A chat bubble reads “paid the piano lesson for [NAME_1]”, with the name replaced by a placeholder. Two chips read $0.036 and 7 calls. Below, a waterfall: one long bar for the turn, then alternating blue model calls and short orange tool calls.

AI Engineering

Watching an Agent Work: Observability and Evals for Lukre

How I added LLM observability and an evaluation lab to Lukre, exploring tracing, privacy, model costs and the limits of early evaluation results.

Oct 15, 202614 min read

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A small block diagram of connected boxes wrapped in a plaster cast, a few stiff connectors poking out. On the right, an orange plug reaches toward the cast and finds no socket. A tiny wrench lies on the floor nearby.

Software Architecture

Coupled to the Way Things Were

On rigid organizations, tightly coupled systems and why, in a large company, change has to start from the inside.

Oct 2, 20266 min read

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AI Engineering

Building Lukre: Where Conversational AI Meets Deterministic Software

From a WhatsApp message to a financial record: the boundaries, contracts and application logic behind Lukre.

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AI Engineering

More Agents, More Coordination

Adding agents moves the hard part to coordination: who decides the work, who keeps state, and who checks that it is done.

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Software Architecture

A Task List Isn't an Execution Plan

Why a list of tasks and an executable plan answer different questions, and when a plain list is still the right tool.

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Engineering Life

Impostor syndrome and the cost of overwork

Impostor syndrome and overwork in software: a personal reflection and three lessons learned the hard way about old friendships, comfort zones and self-sabotage.

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AI Engineering

The age of Rock Stars is ending

A 2024 reflection on AI, programming, and the importance of collaboration: code got cheaper, and design, communication and business understanding matter more.

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Building Products