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Codeminer42’s Engineering Blog

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Category: Advanced

Privacy on Rails Pragmatically complying with data protection laws

Privacy on Rails

Pragmatically complying with data protection laws

Talysson Oliveiraby Talysson OliveiraApril 30, 2026

On a calm and peaceful day, you’re working on your project, combobulating, discombobulating… then this email shows up in the contact inbox: From: notthatdhh@example.com To: …

Jujutsu (JJ): An Alternative to Git? Jujutsu proposes to be simpler yet more powerful than Git. But is it worth switching? Let's find out.

Jujutsu (JJ): An Alternative to Git?

Jujutsu proposes to be simpler yet more powerful than Git. But is it worth switching? Let's find out.

Iasmim Cristinaby Iasmim CristinaApril 16, 2026

We’ve already spent a lot of time using Git… But another tool is trying to offer enough advantages to justify making the switch. Let’s dig …

Mastering Derived Tables in Rails

Mastering Derived Tables in Rails

Anderson Guimarães Mouraby Anderson Guimarães MouraFebruary 26, 2026March 2, 2026

Hey fellow Rails developers! Ever found yourself wrestling with complex SQL queries that involve aggregations, subqueries, or needing to join against computed results? Today, we’re …

Everything you should know about Background Jobs with ActiveJob

Everything you should know about Background Jobs with ActiveJob

Lucas Geronby Lucas GeronFebruary 12, 2026February 13, 2026

Orchestrating background tasks (or "jobs," as they are often called) is common in web development. Any application that deals with time-consuming operations, such as sending …

The Road To JVM: How To Create A Brainfuck Interpreter

The Road To JVM: How To Create A Brainfuck Interpreter

Edy Silvaby Edy SilvaSeptember 11, 2025

While studying low-level programming and the fundamentals of computation, I stumbled upon Brainfuck, an esoteric programming language. It has only eight commands and is very …

How to Speed Up Mobile App Development with Expo OTA Updates

How to Speed Up Mobile App Development with Expo OTA Updates

Vitor Ferreiraby Vitor FerreiraJune 26, 2025July 7, 2025

There are a lot of articles out there talking about how great it is to use OTA updates in production, but in this article, I’d …

React Server Components in Expo: A Practical Guide

React Server Components in Expo: A Practical Guide

Jeferson Britoby Jeferson BritoJune 23, 2025June 23, 2025

I’ve seen a lot of traction towards the development and adoption of React Server Components (RSCs) with new frameworks like React Router and Expo having …

Codeminer42 Hackathon: a lesson on experimentation

Codeminer42 Hackathon: a lesson on experimentation

Edy Silvaby Edy SilvaDecember 3, 2024January 8, 2026

On November 23rd, Codeminer42 organized its first Hackathon. The goal was quite simple: to encourage the experimentation of new technologies in problems that are a …

A Day In The Life of a Ruby Enumerator Let's see what is under the hoods

A Day In The Life of a Ruby Enumerator

Let's see what is under the hoods

Edy Silvaby Edy SilvaOctober 29, 2024October 29, 2024

I spent some time trying to elaborate a good introduction for this post. I wanted to start with a great quote or something like that …

Ruby Enumerators: A Point of View You’ve Never Had When and how to use custom Enumerators

Ruby Enumerators: A Point of View You’ve Never Had

When and how to use custom Enumerators

Edy Silvaby Edy SilvaSeptember 4, 2024September 4, 2024

The 80-20 rule is empirically observed in many human phenomena and activities and it is no different in programming. By understanding a portion of the …

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