300 Days of RuboCop

It’s a story that begins with a pull request and ends with a Zen Buddhist saying:

Servactory – Typed service objects with declarative actions for Ruby

Ruby’s flexibility is great until every developer on the team writes service objects differently. After years of working with Rails codebases where each service had its own structure, error handling, and testing conventions, I built Servactory — a framework that standardizes service objects through a typed, declarative DSL. Read more

⚠️ A major shift in Ruby didn’t come with new syntax — it came with fewer assumptions

At RubyKaigi 2024, the Ruby core team revealed a long-term plan to shrink the traditional standard library and move functionality into default and bundled gems — a change that directly impacts dependency management, upgrades, and production stability. Read more

Rails apps don’t become complex because of scale

Rails apps don’t become complex because of scale — they become complex because we stop thinking the way Rails was designed to work. Read more

The Cost of Change in Software

Explore the philosophy behind software design: preserving changeability, measuring code friction, and balancing technical debt with over-engineering. Read more

Move Over Selenium: Using Playwright in Ruby

The Selenium Struggle If you’ve done any browser automation in Ruby, you know the… Read more

🚀 From 30 minutes to 2 minutes: Speeding up Rails CI without rewriting tests

At Kaigi on Rails 2025, Hayato Okumoto (CTO at TwoGate) shared a practical, production-proven approach to ultra-fast CI for large Rails applications. Read more

The Stateful Scraper: Why Mechanize is Still Relevant

The “Overkill” Problem If you ask a developer today how to scrape a website that requires… Read more

Design for Developers: How to Stop Making Ugly Apps

The “Blank Page” Paralysis You have the database schema planned. You have the models… Read more

3 Robots walk into a room ...

I call my LLM-based service objects robots instead of agents. Why? because robots do what you tell them. Agent have agency. That means they can make choices and do whatever they want to do. Like travel agents, real-estate agents, FBI agents. Robots are machines that follow instructions. That’s what I want. My objects should follow my instructions… but what happens when you add a little bit of agency to 3 robots and put them into a room with a set of tools that allow them to communicate with eah other through shared memory, broadcast message channels and direct message channels. Then you tell all 3 robots to do the same thing? They become a self-organizing group. SOGs have agency. Read more

🚫 Stop checking admin? — it might be creating technical debt.

Authorization bugs are among the most dangerous issues in SaaS systems. A single mistake can expose salaries, contracts, or customer data — and destroy trust. Read more

Stop wasting time creating dummy files for your tests!

fake-file: A lightweight Ruby gem to effortlessly mock and generate files for your tests. I’d love to get your feedback or see your PRs!

Evaluating LLM prompts in Rails

Finding the right model and prompt for your AI feature is harder than it looks. Spreadsheets help, until they don’t. So we did something about it.

Introducing Icons: add any icon library to your Ruby app

https://railsdesigner.com/introducing-icons-gem/ Almost two years ago I published Rails Icons; now the core is extracted into a new gem for any Ruby apps: Icons Read more

Why Your Next Rails App Doesn't Need Nginx or Apache

The “Nginx Tax” For the last 15 years, deploying a Rails app to production involved a… Read more

Scraping at Warp Speed: Parallelism vs. Concurrency

The 100,000 URL Problem You’ve been tasked with scraping a massive product catalog. You… Read more

Test Driving Rails v1.1 (a Minitest & Fixtures book) is released

A new revision for the 1st edition of Test Driving Rails is released. Comes with database optimizations and Claude Code skills.

🚀 How a 10-Year Rails Application Finally Achieved Linear Scaling

🚀 How a 10-Year Rails Application Finally Achieved Linear Scaling — Lessons from Kaigi on Rails 2025 Read more

I made ruby input libraly inspired by golang huh!'s input

Simple Prompt Read more

mlx-ruby: Ruby bindings for Apple’s MLX ML framework

MLX-Ruby is a native C++ extension providing full Ruby bindings for Apple’s MLX machine learning framework. It includes neural network layers, optimizers, function transforms (grad, vmap, etc.), and Metal GPU support on Apple silicon. Read more

🚀 Rails 8 Authentication: Understanding What’s Under the Hood

Rails 8 introduces something many of us have waited for: a built-in authentication generator — rails g authentication. Read more

llm.rb v4.1.0 is out

The feature-rich, zero-dependency, and flexible Ruby toolkit for talking with multiple LLMs has had another release. Since the last announcement, which was many releases ago, a lot changed. Check out Github for more info.

The Captcha Wall: Solving Challenges Programmatically with Ruby

The Ultimate Boss Battle You’ve optimized your headers. You’re rotating residential… Read more

Stimulus.js Crash Course: Build a "Copy to Clipboard" Feature in 5 Minutes

Meet Vessel: The "Scrapy" of the Ruby World

The Missing Piece In the Ruby scraping ecosystem, we have excellent low-level tools. … Read more