Leandro Proença

Software developer 15+ years building software for startups and enterprises worldwide. Language junkie specializing in Ruby, Elixir, Rust, and occasionally diving into Assembly and low-level programming. I write about systems programming, software architecture, concurrency patterns, and cloud infrastructure. You'll find deep dives into how computers actually work under the hood, building stuff nobody asked for, performance optimization, and everything DevOps. Posts written occasionally in Brazilian Portuguese or English.

Web 101 🇧🇷 Concorrência 101 🇧🇷 AWS 101 🇧🇷
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You don't need Kafka: Building a message queue with only two UNIX signals

21 Oct 2025
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kafkaunix

Voltando às raízes de blogueiro

18 Oct 2025
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blog

Um resumo do meu 2024

18 Oct 2025
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braziliandevs

Arrays em Assembly x86

17 Aug 2024
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assembly

Construindo um web server em Assembly x86, the grand finale, multi-threading

14 Jul 2024
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braziliandevsassembly

Construindo um web server em Assembly x86, parte V, finalmente o server

25 May 2024
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braziliandevsassembly +1

Construindo um web server em Assembly x86, parte IV, um assembly modesto

13 May 2024
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computersciencebraziliandevs +1

Construindo um web server em Assembly x86, parte III, código de máquina

23 Apr 2024
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assemblybraziliandevs

Construindo um web server em Assembly x86, parte II, história e arquitetura

11 Apr 2024
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assemblybraziliandevs

Construindo um web server em Assembly x86, parte I, introdução

09 Apr 2024
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assemblybraziliandevs

Superficial, básico e avançado

09 Mar 2024
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webdev

Building a dead simple background job in Rust

12 Nov 2023
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rust

Understanding the basics of Smart Pointers in Rust

01 Nov 2023
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rustdatastructures

Compiladores, trampolim, deque e thread pool

17 Oct 2023
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rubywebdev

Rust, Go, Rinha e I/O

08 Sep 2023
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braziliandevsrust +2

Entendendo fundamentos de recursão

23 Jun 2023
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programmingruby +1

Vencendo os números de ponto flutuante: um guia de sobrevivência

06 Jun 2023
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computersciencebraziliandevs

Winning at floating-point issues: a survival guide

01 Jun 2023
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computerscienceprogramming

[pt-BR] Fundamentos do Git, um guia completo

24 May 2023
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gitlinux +1

AI & Ruby: an introduction to neural networks

19 May 2023
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rubymachinelearning +2

Kubernetes 101, part VIII, networking fundamentals

13 May 2023
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kubernetesdocker

Kubernetes 101, part VII, jobs and cronjobs

29 Apr 2023
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kubernetesdocker

A comprehensive introduction to Ruby

28 Apr 2023
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rubyrails

Kubernetes 101, part VI, daemonsets

05 Apr 2023
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kubernetesdocker

Kubernetes 101, part V, statefulsets

01 Apr 2023
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kubernetesdocker

SQL JOIN explained

17 Mar 2023
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sqldatabase +1

Git fundamentals, a complete guide

15 Mar 2023
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gitlinux

Kubernetes 101, part IV, deployments

12 Mar 2023
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kubernetesdocker

Kubernetes 101, part III, controllers and self-healing

12 Mar 2023
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kubernetesdocker +2

Kubernetes 101, part II, pods

01 Mar 2023
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kubernetesdocker +2

Kubernetes 101, part I, the fundamentals

23 Feb 2023
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Tekton CI/CD, the grand finale, interceptors

22 Feb 2023
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kubernetesdocker +1

Tekton CI/CD, part IV, continuous delivery

21 Feb 2023
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firstpostcareer +1

Tekton CI, part III, listen to Github events

19 Feb 2023
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tutorial

Tekton CI, part II, sharing information

19 Feb 2023
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kubernetesci +2

Tekton CI, part I, a gentle introduction

19 Feb 2023
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discusssoftwaredevelopment +1

CI/CD in a nutshell

19 Feb 2023
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cicd +2

Seu dinheiro não é infinito

21 Oct 2022
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leadershipmanagement +1

Liderança começa com confiança: minha trajetória

17 Sep 2022
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Thinking like containers

09 Aug 2022
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dockerlinux

Simulating OOP in Bash

06 Aug 2022
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oopbash +1

Building a Web server in Bash, the grand finale

01 Aug 2022
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webdevhtml +2

Building a Web server in Bash, part III - Login

01 Aug 2022
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webdevlinux +2

Building a Web server in Bash, part II - parsing HTTP

01 Aug 2022
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webdevhttp +2

Building a Web server in Bash, part I - sockets

01 Aug 2022
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webdevhttp +2

Inter-process communication: pipes

14 Jul 2022
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unixlinux

Inter-process communication: files

13 Jul 2022
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unixlinux

A brief history of modern computers, multitasking and operating systems

12 Jul 2022
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unixlinux +2

Métricas cAdvisor no Kubernetes com Prometheus e Grafana

06 Jul 2022
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kubernetesprometheus +1

Prometheus on Kubernetes 101

06 Jul 2022
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prometheuskubernetes +1

Mastering the Docker networking

05 Jul 2022
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dockerlinux +1

Implementando um simples background job com UNIX named pipes

15 Jun 2022
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unixlinux +1

Entendendo UNIX pipes

15 Jun 2022
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unixlinux +1

Resolvendo problema de performance no PostgreSQL com CTE

13 Jun 2022
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sqlpostgres +1

A very simple GraphQL tutorial in Ruby

03 Mar 2022
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rubygraphql

Mastering Docker Volumes

05 Feb 2022
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dockercontainers +1

How to reduce the time complexity of nested loops

04 Dec 2021
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programmingruby +1

A powerful full-text search in PostgreSQL in less than 20 lines

16 Sep 2021
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postgres

A CRUD journey in Haskell, part II, Socket programming

10 Aug 2021
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haskellnetworking +2

A CRUD journey in Haskell, part I, introduction

03 Aug 2021
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haskellprogramming +1

Using Docker in development the right way

29 Jun 2021
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dockercontainers

Web basics: sending HTML, CSS and Javascript content through HTTP

09 May 2021
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rubyhtml +2

Web basics: a simple HTTP Server in Ruby

03 May 2021
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rubytdd +1

Web basics: a TCP Server in Ruby

30 Apr 2021
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rubytcp +2

Boilerplate for a containerized plain Ruby application

28 Apr 2021
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rubytdd +2

Quicksort, a Ruby implementation using Test-driven development

16 Apr 2021
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rubyquicksort +2

Deploy to Kubernetes using Github Actions (including Slack notification)

14 Apr 2021
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githubaws +2

Ruby blocks made easy, part III ~grand finale~, blocks and syntactic sugar

10 Apr 2021
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rubyprogramming +1

Ruby blocks made easy, part II, curry and procs as arguments

10 Apr 2021
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rubyprogramming +1

Ruby blocks made easy, part I, methods and procs

10 Apr 2021
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rubyprogramming +1