I’m Michał Łęcicki (aka Maikhel), ruby software engineer from Visuality 👋
I believe self-improvement, responsibility and clean solutions are necessary to get things done: both in software development and real life.

Feel free to check some of my posts below. There are also some photos and more information about me.

Load Path in Ruby - How It Works?

Recently, I encountered a weird Ruby error: Gem::LoadError: You have already activated X, but your Gemfile requires Y. A quick Stack Overflow search and a few commands with Bundler, and it was fixed. But it got me thinking: why did it happen in the first place? What does it even mean to activate a gem, and how may Ruby want to activate two gem versions at the same time? Let’s search for answers together.

Posted on 15 December 2025

Tradeoffs of Anonymising Production Data

At some point, in every Rails project, someone says: ‘Hey, our testing dataset is not relevant anymore, maybe we could anonymise production data and use it instead?’. That’s when a tough journey begins: ensuring data privacy, updating scripts, and securing infrastructure. Let’s explore the challenges you might face if you decide to anonymise your production data.

Posted on 18 August 2025

How to become Ruby Certified Programmer

Official certifications aren’t very popular in the Ruby on Rails community, but one is available if you’re interested: the Ruby Association Certified Ruby Programmer Examination. This test checks your knowledge of the Ruby programming language. I decided to give it a try! I passed the exam and want to share my insights to help you do the same.

Posted on 20 December 2024

Handling Errors in Concurrent Ruby

In the previous blog post on Ruby concurrency, we explored how to spawn many sub-threads with a concurrent-ruby gem. Let’s continue the topic and get to know the Future class much better: its life cycle, state methods, and strategies for error handling.

Posted on 22 October 2024

Smooth concurrent updates with Hotwire Stimulus

In the previous blog post, we learned how to create a simple progress bar with Hotwire Turbo and broadcast updates to the frontend. But sometimes, simple solutions aren’t enough. It’s time to get familiar with another part of Hotwire: Stimulus! In this article, I’ll demonstrate how to use Stimulus to handle more complex frontend logic.

Posted on 07 June 2024