Carlos Souza

Zippato

Mon, 01 Jan 0001 00:00:00 +0000

A web app for freelancers and consultants to create, send and manage invoices.

Find My Tris

Mon, 01 Jan 0001 00:00:00 +0000

Find your perfect IRONMAN triathlon. Search and filter IRONMAN, IRONMAN 70.3 and 5150 events worldwide by distance, location, weather and course type.

Nidra

Mon, 01 Jan 0001 00:00:00 +0000

An iOS app for guided yoga nidra, NSDR and body scan, for deep rest and sleep.

Xogmios

Mon, 01 Jan 0001 00:00:00 +0000

An open source Elixir client for the Cardano blockchain: query, stream blocks and submit transactions through Ogmios.

JNGL - Cardano Stake Pool

Mon, 01 Jan 0001 00:00:00 +0000

The JUNGLE stake pool (ticker JNGL) on the Cardano blockchain. I operated it for almost 4 years, from August 2022 until its planned retirement in April 2026. Two-time recipient of a Cardano Foundation delegation in recognition of contributions to the ecosystem.

Work With Cardano

Mon, 01 Jan 0001 00:00:00 +0000

A YouTube channel that teaches the skills required to work with the Cardano blockchain.

About

Fri, 01 May 2026 00:00:00 +0000

Hi, I’m Carlos. I’m a technologist and I have been writing software professionally for over 20 years.

What I do

Consulting. I build software for clients.
Products. I build small, focused apps such as Zippato, FindMyTris and Nidra iOS.
Teaching. I’m a published Pluralsight author with over 50 courses. I also give talks at conferences and meetups.

When I’m away from the keyboard I’m probably making coffee.

Get in touch

Hit me up if you’d like to chat: carlos(AT)csouza.me. You can also find me on GitHub and LinkedIn.

The Rising Cost of Being an AI-Powered Developer

Fri, 27 Feb 2026 00:00:00 +0000

There’s a strange irony sitting at the center of modern software development. Personally, since Ruby on Rails came out, this is the moment in my career where I’ve felt the most productive and had the most fun. At the same time, I’ve never paid more for the privilege.

I’ve been writing software professionally for almost 20 years. When I got started, the barrier to entry was remarkably low. My first tech stack was LAMP. To write PHP + MySQL you could get away with a fairly inexpensive computer, a text editor, and an internet connection. Everything else (the language, the framework, the database, the deployment tools) was both libre and gratis.

Prompts, Rules, Tools, MCP e Skills: Decifrando a Sopa de Letrinhas dos Coding Agents

Mon, 02 Feb 2026 00:00:00 +0000

Se você está acompanhando a evolução dos agentes de código com IA, provavelmente já se deparou com uma sopa de letrinhas e conceitos que parecem ter sido inventados na semana passada: Prompts, Rules, Tools, MCP, Skills…

A boa notícia é que esses conceitos não são tão complicados quanto parecem. A má notícia? Quase ninguém explica direito a diferença entre eles. Então nesse post eu vou te ajudar com isso.

Começando pelo Básico: Prompts

Prompts são as instruções em linguagem natural que você dá para o agente. É literalmente o que você quer que ele faça.

Handling Gaps in Time-Series Data with PostgreSQL's generate_series() and Ecto

Mon, 26 Jan 2026 00:00:00 +0000

Introduction

Consider a monitoring system for a weather station. A sensor in the field collects temperature readings every hour and reports them back to the system, but occasionally goes offline due to power outages or maintenance. When generating daily reports, the data shows gaps.

Querying the readings table for a particular day returns only the hours when the sensor was operational. Asking users to figure out which hours are missing feels like poor UX.