A reusable tooltip built with a custom element
Custom elements are amazing . They’re a built-in browser feature, not some library you npm install and then hope it will be maintained. You define a…
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How I Hunted Down 23 N+1 Queries in a Rails App With Claude Code
TL;DR Our Rails app's p95 response time had crept from 280 ms to 1.4 s over a year, and nobody could say why. I paired with Claude Code for four day…
My build-in-public tool showed I had quit. So I rebuilt it on itself.
Originally published on the Openstage blog . Openstage turns your GitHub commits, along with notes, posts and milestones you add, into a public time…
Learning Go as a Ruby Developer #7: Finally Understanding Pointers
Pointers were probably one of the concepts I was most curious about when I started learning Go. Coming from Ruby, I don't normally think about memor…
More than click and submit: use any event with Stimulus
I recently surprised someone by showing you can use any event besides the common click , submit and keydown events. The Stimulus docs list those sev…
Sidekiq to Kafka: A Mental-Model Map for Rails Developers
TL;DR: If you've spent years with Sidekiq, Kafka can look like "Sidekiq with extra steps". It isn't. Sidekiq moves jobs (commands to do something).…
Did I Miss Anything? Rails World FOMO and What I Actually Want From a Conference
Rails World happened this week in Austin, and I wasn't there. I've never been to Rails World, or RailsConf for that matter. This year the timing jus…
Polymorphic Associations in PostgreSQL: One commentable_id Column or a Foreign Key per Table?
Disclosure: I build Schemity , a desktop ERD tool - this post is from our blog and uses it for the examples. TL;DR: A polymorphic association stores…
Lazy loading, optimistic UI and more in Rails with Attractive.js
This is the last article of a series where I introduce Attractive.js 1.0.0 (in pre-release now). Attractive.js 1.0.0: interactive HTML without one l…
Why change-impact analysis is surprisingly hard in Ruby on Rails
Refactoring a mature Rails app often starts with a simple question: If I change this method, what else could break? In a smaller codebase, grep migh…
Reducing role queries across dev.to role-heavy paths
This is part of casestudies for my Rails performance service. At a glance Problem The same users’ roles were queried repeatedly while each path eval…
KPIAssembler: stop hand-picking KPIs, let AI propose them
Text-to-SQL looks great in a demo. Then someone ships a conversion rate that JOIN s without ON , a revenue figure that double-counts through a fan-o…
Your Webhook Endpoint is a Tiny Distributed System
If you want the Rails implementation version of this, Webhooks in Rails goes deeper on verification, durable receipt, idempotency, retries, jobs, te…
🟣 Ever Fluorescent: Live Again!
⭐Excitement! I've had had stores on Shopify, and a successful Etsy store. But after years of ups and downs and general nonsense, I'm done living by…
Fundamental analysis in Ruby, straight from SEC EDGAR
fundamentalista is a Ruby gem for fundamental analysis of listed companies. Version 0.6.0 is on RubyGems. Fundamentalista . configure { | c | c . ed…
Upscaling guest photos with a local model instead of an API
I run Knipsmig , a QR-code photo sharing service for weddings and parties. Guests scan a code and upload straight from the phone, no app. Most of th…
The 14 errors you will hit deploying Rails with Kamal on Hetzner behind Cloudflare (and the fix for each)
I run every one of my side projects the same way: a Rails 8 app, a €4/month Hetzner box, Kamal 2, Cloudflare in front. It's cheap and it works. But…
Re-Organized configuration in Rails
A while back I wrote about organizing configuration in Rails . The idea was simple: drop YAML files into config/configurations/ and get namespaced c…
ExtensionDash: tracking a browser extension from your agent
After shipping two browser extensions this year — Reverse Image Search Anywhere and Stackpeek — I still could not answer the simplest question about…
Fixing Delicate Cache Mismatches in a Brownfield SPA: A Pragmatic Solution
Building in public often means talking about shiny new features, but in mature production applications, the most critical engineering work is usuall…
I Tested Rails Baseline by Leaving Architecture Out of the Prompt
Note: Rails Baseline is the production-ready Rails foundation I tested here. It gives a new SaaS application and the coding agents working in it cle…
I Could Hack My Own Rails App With One Hidden Input
I've been building RepBoard , a Rails app that gives freelancers a portable reputation profile — collect reviews from clients, share one professiona…
Rails Routing & APIs: What Actually Happens Between the URL and Your Controller
When I started studying APIs more seriously, I realized there was a problem with the way I was learning. I knew how to create a Rails API. I knew ho…
Performance Gains After a Rails Upgrade from 7 to 8
Between deprecation warnings, gem compatibility checks, and the inevitable late-night debugging session, the process can feel like a lot of effort f…
Fixing "g++ Not Found" When Debugging Rails in RubyMine on Fedora
Fixing "g++ Not Found" When Debugging Rails in RubyMine on Fedora TL;DR: If clicking "Debug" in RubyMine on Fedora fails to install debase because o…
When a build breaks, the bug fixes itself
When a build breaks, the bug fixes itself We stopped babysitting CI failures. Now a red build files its own bug — and an AI agent picks it up and sh…
Built a Blog App with Rails & PostgreSQL – Looking for Code Review!
Hey DEV community! 👋 I've been working on a Blog Application built with Ruby on Rails to practice backend architecture, clean code standards, and Ra…
Work-in-progress updates on my new book, Testing Rails from Scratch
Hello! It has been a couple of months since I announced my latest project, Testing Rails from Scratch: A practical, (mostly) out-of-the-box approach…
Learning Go as a Ruby Developer — Part 4: What can we do with a single "for"
So loops in ruby has several ways to implement 10 . times do | i | puts i end while condition # ... end users . each do | user | # ... end until fin…
Why I Stopped Waiting on Ruby LSP and Built My Own Fuzzy Symbol Search for VS Code
If you've worked in a mid-to-large Rails codebase in VS Code, you've probably run into this: you want to jump to a method, you hit Ctrl/Cmd+T, you t…