Ruby on Rails Engineer Claude Skill

Name: Ruby on Rails Developer AI Skill - Merle
Brand: KissMySkills
Price: 19 USD
Availability: InStock

Ruby on Rails Developer, Merle AI skill by KissMySkills, cover

Ruby on Rails Developer AI Skill - Merle

Merle turns Claude into a Senior Ruby on Rails Engineer who diagnoses N+1 queries, Sidekiq retry storms, and Rails upgrade risk before you ship.

$19 this skill one payment yours forever

Claude skill package instant downloadmerle-ruby-on-rails-engineer.skill

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How it works

Ask it something hard.

📎 merle-ruby-on-rails-engineer.skillLOADED ✓

Sidekiq queue hit 80k jobs overnight - retries of one mailer that 500s. Some users got 6 copies of the same email. Untangle this?

CLAUDE · WITH THIS SKILL Two separate sins here: the mailer isn't idempotent, and retry policy sat at the default 25 attempts over 21 days. Immediate: kill retries for that job class to drain the queue, then add an idempotency key - a deliveries table with a unique index on user, email type and dedup window, checked before send - so a retry becomes a no-op instead of copy number 7. Then fix the actual 500 (a mailer raising on a nil the template assumed) and set sane retry: 3 attempts, then dead set with an alert. House rule going forward: any job with an external side effect checks idempotency before the effect. Want the migration pattern?

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Questions before you buy? A person answers, usually the same day: hello@kissmyskills.com

// the file itself

Read it before you buy it.

The first lines of the file your AI will read, exactly as delivered. Nothing rewritten for the page.

// the skill your AI runs on

You are Merle, a Senior Ruby on Rails Engineer who confirms an N+1 with Bullet before reaching for includes, and treats a Sidekiq retry storm as a symptom. You have been activated to keep a production Rails application fast.

Drop Merle into Claude and get a Senior Ruby on Rails Engineer who has carried Rails apps through traffic growth, major version upgrades, and the inevitable moment when a "just add an index" ticket turns into a three-day investigation. Merle does not treat Rails conventions as gospel or as a straitjacket. He knows exactly where "convention over configuration" earns its keep and exactly where a team's real domain complexity justifies breaking from it, and he can explain which is which before writing a line of code. Merle covers the full backend engineering surface for Ruby on Rails: MVC architecture and where convention over configuration helps or hurts, ActiveRecord query performance (N+1 detection, eager loading, indexing strategy), background job processing with Sidekiq (queue design, retry behavior, idempotency), Rails major version upgrade strategy, API-only Rails applications, and a testing strategy built on RSpec, FactoryBot, and Capybara system tests that catches regressions without turning every PR into a

SKILL.md · 182 lines · instant download

// what's inside

What's inside this skill

N+1 query fixes with the corrected scopes written
Sidekiq retry and idempotency plan for your jobs
Rails upgrade risk list broken down gem by gem
A ship order telling you which fix goes first

Rails developers and small teams handling upgrades and Sidekiq without a lead

// two ways to get it

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// ask your assistant

Or let your AI set up this skill for you.

Go to kissmyskills.com/pages/connector and set up the "Ruby on Rails Developer AI Skill - Merle" skill (handle: merle-ruby-on-rails-engineer) for me

Paste it into Claude, ChatGPT, Claude Code, Cursor or Codex. Your AI walks you through connecting KissMySkills (about 3 minutes, 7-day free trial) and loads the skill. What your AI will read →

What you're actually buying

What Merle Does

Merle turns Claude (or ChatGPT, or any AI chat) into a Senior Ruby on Rails Engineer who diagnoses N+1 queries, Sidekiq retry storms, and Rails upgrade risk from real query logs and job data, then hands back a concrete, ready-to-execute plan.

Who It's For

Rails engineers and founders running a production Rails application who need ActiveRecord performance, Sidekiq reliability, or upgrade-strategy decisions made correctly.

Key Capabilities

Rails MVC and convention over configuration: when standard conventions help and when service/form/query objects are actually warranted
ActiveRecord performance: N+1 detection with Bullet, includes vs preload vs eager_load, and database indexing strategy
Sidekiq background jobs: queue design, retry/backoff behavior, and designing jobs to be idempotent so retries don't double-process
Rails upgrade strategy: one minor version at a time, deprecation warnings resolved first, and a rollback plan at each step
API-only Rails applications: serialization choice, versioning strategy, and authentication for a Rails API backing a separate frontend
Testing strategy: RSpec model and request specs, lean FactoryBot factories, and a small set of stable Capybara system tests

How to Use It

Download the skill file and paste the full contents into your Claude Project Instructions (or any AI chat's system prompt). Then describe your problem in plain language and get back a concrete, ready-to-execute plan - no re-explaining context every session. Works with Claude, ChatGPT, and any AI chat. Under 2 minutes to install.

// how to install Under 2 minutes

Four steps. Any AI chat.

01
Download the file
After checkout, the download link lands in your inbox. Save the .skill file: Claude takes it as it is.
02
Open your AI chat
Any AI chat you already use: Claude, ChatGPT, Gemini, Grok, Copilot or another.
03
Add it to your AI
Claude: Settings → Capabilities → Skills, upload the .skill file. ChatGPT, Gemini and others: open the .skill file like a .zip archive and paste SKILL.md into custom instructions or Project instructions.
04
Start working
Your AI is now configured as a specialist. Ask it anything inside its domain.

No technical knowledge required.

With Library there is nothing to download. Connect your AI once, then just ask: "Load Ruby on Rails Developer AI Skill from KissMySkills."

Setup guide → Library · $9/mo →

// faq

Questions about this product

What AI tools does this work with?+

Claude, ChatGPT, or any AI chat that accepts a system prompt or Project Instructions. Claude Projects gives the best results.

How do I install it?+

Paste the SKILL.md contents into your Claude Project Instructions or system prompt. Under 2 minutes, no setup required.

Is this a course or a tool?+

It's a single skill file, not a course. Load it once and Merle applies the same expertise and methodology from the first message of every session.

Can Merle fix a Sidekiq retry storm?+

Yes. Merle treats a retry storm as a symptom to diagnose first, a downstream API outage, a non-idempotent job, or bad data, before recommending any change, rather than just bumping worker concurrency.