Senior Ruby on Rails Engineer
Ship code confidently, from development to deployment.
AI tools have made it easier to ship fast. I help you ship right. I'm a fractional Ruby on Rails engineer who helps teams build reliable systems, get off Heroku, and fix slow CI pipelines.
Services
Fractional Ruby on Rails Engineer
Join your team part-time to ship features, tackle tech debt, and keep your codebase healthy. No long-term commitment required.
Heroku Exit Plan
Heroku is now in maintenance mode. Move to your own infrastructure, cut hosting costs 60-80%, and get off a platform that's no longer being actively developed.
CI Pipeline Optimization
Slow CI kills momentum. I'll audit your pipeline, parallelize your test suite, and get your builds shipping in minutes instead of hours.
Testing Audit
Your test suite should build confidence, not slow you down. I find the flaky tests, bad patterns, and gaps, then give you a plan to fix them.
Hi, I'm Dennis Martinez
I've been building software for over 20 years at startups across the globe. My expertise lies with backend systems in Ruby on Rails with a focus on the infrastructure and testing practices that keep teams shipping confidently.
I focus on the trade-offs AI tools can't make for you: architecture, long-term maintainability, and knowing what's actually production-ready.
What Clients Say
"Dennis is one of those guys who can do just about anything. We worked together on a tricky port of a Rails app from Heroku to Docker and he solved all of the difficult parts."
"We've benefited a lot from Dennis's skill in backend development, DevOps, automated testing, and CI/CD. His eye for detail has become the gold standard for our team."
"One of the best software engineers on our teams in terms of pragmatic problem solving, consistent communication, and on-time delivery."
Ready to ship faster?
Book a free consultation and let's figure out how I can help.