DLN.
Accepting Projects for Q1 2026

Your business is ready to scale. Your Rails monolith isn't.

Here's the thing: you don't need another developer. You need a specialized fleet of AI agents that upgrade, test, and refactor your legacy codebase while your team focuses on shipping features.

Damian Le Nouaille

Why I built this.

I'm Damian. I've spent 15 years inside large Rails codebases. Trust me when I say this: I've seen the same pattern destroy velocity at company after company. Teams hire brilliant developers to build features, but the "janitorial work" (upgrades, flaky tests, refactoring) gets ignored until it kills momentum.

Here's what nobody tells you: hiring more humans to fix technical debt is a losing battle. It's slow. It's expensive. And your best developers hate doing it.

So I stopped taking standard freelance contracts. I built a machine to do the heavy lifting instead.

Most companies don't know how to implement agents correctly. They throw markdown files with rules at the problem and call it AI. That's not what I do. I build real agents that understand your codebase and execute autonomously.

The Monolith Bottleneck

These problems are solved. It just takes the right process and the right tools to make it happen.

The "Friday Fear"

You only deploy once a day. Never on Fridays. Why? Because your CI takes 45 minutes and you don't trust the test suite. Every merge feels like rolling the dice. There's a fix for this.

The Upgrade Wall

You're stuck on Rails 6.0. You know you need to upgrade to 7.2 or 8.0. But it's a massive project nobody wants to own. This doesn't have to be painful.

The Hiring Trap

You're trying to hire Senior Devs to fix this. But onboarding takes forever. By the time they're productive, the codebase has moved on. There's a better way.

The AI Illusion

You gave your team Cursor and Copilot. Great tools. But here's what happened: they write legacy code faster now. The architecture problems? Still there. The right agents change this.

My Optimization Infrastructure

Let me be clear: I don't sell a SaaS. I deploy these agents directly into your repository. They do the work of an entire Maintenance Team. And they never get tired.

Recent Case Study: FinTech Series B

Rails Version
6.0 7.2
CI Time
42m 9m
Test Coverage
65% 94%
Deploys/Wk
2 8

The ROI is simple.

A typical engagement frees up $100k+ / year in senior engineering time. How? By removing the recurring friction that slows everyone down: slow CI, upgrade debt, risky refactors. Your team stops firefighting and starts building.

This also improves Revenue Per Employee by increasing output without increasing headcount. Your CFO will notice.

The Future of Development

Internalize Your Agents

Here's the key insight: you need to own your automation. Use the latest models. Customize the workflows. Keep your code private. Agents become permanent assets that stay with your company forever. This is how you future-proof your stack.

Redefine Developer Roles

Your developers shouldn't spend 80% of their time on execution and 20% on strategy. Flip that ratio. Let AI handle the grunt work while your team focuses on product vision, technical surveys, and meaningful innovation. That's where the magic happens.

How Each Agent Works

Transparency builds trust. I'll show you exactly what each agent does, its safety guarantees, and what to expect. No black boxes here.

UpgradeAgent

Gem Upgrade Agent

Automated dependency upgrades with full changelog analysis, CVE detection, and isolated test validation. No more dependency hell.

Bundler RubySec Conservative Updates
ReviewAgent

Code Review Agent

Deep code review for security vulnerabilities, N+1 queries, architecture drift, and Rails best practices. Catches what humans miss.

Security Performance Best Practices
RailsUpgrader

Rails Version Upgrader

Major Rails version migrations (6→7→8) with zeitwerk fixes and config updates. The upgrade project nobody wants to do. Done.

Rails 6-8 Zeitwerk Config Migration
LegacyRefactor

Legacy Code Refactor

Extract god objects, split fat controllers, and modernize patterns. The scary code everyone avoids? It becomes maintainable.

Service Objects God Objects Fat Controllers
DocMaster

Auto Doc Agent

Generate YARD comments, READMEs, and API docs from code analysis. Documentation that's always up to date. No more excuses.

YARD API Docs READMEs
PerformanceBot

Performance Fixer Agent

Fix N+1 queries, add missing indexes, and optimize memory usage. Your app gets faster without anyone spending hours profiling.

N+1 Queries Bullet Indexes
FlakyFixer

Flaky Test Fixer Agent

Identify and fix intermittently failing tests. No more CI lottery. You push code knowing it's actually green.

Timing Issues Async CI Reliability
TestDoctor

Test Fixer Agent

Diagnose and fix failing RSpec tests with systematic debugging. Red tests turn green. Automatically.

RSpec Debugging Factories
FeaturePlanner

New Feature Planner Agent

Plan implementations with architecture decisions and task breakdown. Start building with clarity, not guesswork.

Architecture Task Breakdown Planning
I18nExtractor

I18n Extractor Agent

Extract hardcoded strings to locale files for internationalization. Going global becomes a lot less painful.

Locales YAML t() Helper
BootOptimizer

Fast Boot Optimizer Agent

Reduce Rails boot time by optimizing gem loading and initialization. Your console starts in seconds, not minutes.

Bootsnap Lazy Loading Initializers
ViewHarmoniser

Harmonise Views Agent

Standardize spacing, colors, and styling across your views. Make your app look like one product, not a patchwork.

Consistency Design Tokens Components

How I Differ From Agencies

Capability Me Typical Agencies
Custom AI Agents (not SaaS)
Codebase stays private
15 years Rails expertise Partial
Agents evolve with your code
Direct access to expert Team

Questions You Might Have

"We have a unique stack. Will this work?"

Let me be direct: yes. The agents are framework-agnostic and learn your specific patterns. I build them to understand your codebase's unique architecture. They adapt to you, not the other way around.

"We tried Cursor/Copilot and the code was garbage."

Here's the thing: that was months ago. Models have evolved dramatically. But more importantly, bad results usually come from poor context, not bad models. My agents add context intelligently. They understand your codebase before they write a single line.

"Do we implement all agents at once?"

Absolutely not. We start step-by-step, targeting your biggest bottleneck first. Monitor results. Then add more agents as needed. No overwhelm. Just steady progress.

"Can we do everything remotely?"

Yes. All collaboration happens via Slack, GitHub, and video calls. I work with companies worldwide. Distance doesn't slow anything down.

How We Work Together

1

The Audit

Discovery Phase

A low-risk "Health Check." I run static analysis tools and do a manual architectural review. You get a PDF report of vulnerabilities, bottlenecks, and a "Complexity Score." No commitment required.

$1,500 (Refundable)
2

The Cleanup Sprint

Execution Phase

A 2-week intensive sprint. I deploy the agents to execute the roadmap defined in the audit. We target the highest ROI bottleneck first (usually upgrades or CI speed). You see results fast.

$25,000 / Sprint
3

The "Guardian"

Retainer Phase

I keep your app modern. Monthly dependency updates, continuous agent tuning, and performance monitoring. Your codebase stays healthy long-term.

From $5,000 / Month

Let's turn your Rails app into a masterpiece.

You're closer than you think to cleaning all your legacy code.

Damián Le Nouaille
Start with an email
I usually reply within 24 hours.
Copied.
Suggested Template
To:
Subject: Need Rails AI Agents for our Rails app

Hi Damian,

I'm [Your name], the [Role] of [Company].

We have [X] devs on our Rails monolith.

Velocity is suffering due to [slow CI / upgrades / tech debt].

Can you help us build a maintenance strategy for 2026?

See you soon,

Or book a call directly
Skip the inbox and find a time that works.
Book a Call
You can also read my story first.