Hire mid-level Ruby on Rails developers in France

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CTO, Senior Full Stack Dev | RoR and Js/Typescript Expert | Remote

High response rate

Senior software engineer with over 10 years of experience as a remote freelancer. My educational background includes an MSc 2:1 in computer science and applied mathematics engineering from ENSEEIHT (Toulouse, France) in 2009. I then worked for 2 years as a frontend developer at a startup in London and transitioned to backend work in 2013. Specializing in web application development, I have undertaken projects for companies such as Carrefour, L'Oréal, Cocolis, Epicery, and Alerti. My work has encompassed backend development, data engineering, code and database performance improvement, e-commerce platform customization and logistics, payment system integration, API creation, crawlers, technical documentation, and testing. Passionate about data manipulation and rendering them to users and stakeholders in a more meaningful way, I am currently expanding my skills in AI/ML and neural networks through CNRS fidle formation to explore how I could apply and offer these services to my clients. Recent milestones and accomplishments include: Migrating the payment system from Adyen to Stripe for Epicery Migrating the frontend from Vue to Hotwire for Epicery Developing a geolocalized matching algorithm between carriers and packages for Cocolis Fields of expertise: E-commerce solutions with Solidus/Spree open-source framework Data processing and visualization with Business Intelligence tools for reporting Integration of payment system providers Integration of third-party APIs Database design and performance optimization Frontend performance optimization Crawling and scraping Technical audits Testing, documentation, CI/CD tools Experience with the following tools: Languages: Ruby, Typescript, JavaScript, Node.js, Ruby on Rails Platforms: AWS, Google Cloud Platform, Render, Heroku Frontend: React, Vue.js, Hotwire, Angular, HTML/CSS, Alpine.js, HTMX, Astro Payment providers: Stripe, Mangopay, Adyen, PayPal Data viz: Amazon QuickSight, Superset, Tableau Backend tools: Solidus open-source e-commerce solution, New Relic, Elasticsearch, PostgreSQL, Amazon S3, etc. CI/CD Tools: GitHub CI, CircleCI Fluent in French, English, Spanish.

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Highly skilled Ruby on Rails engineer with a decade of experience designing, building, and optimizing robust web applications. Proficient in full-stack development, with expertise in PostgreSQL for scalable database solutions, Bootstrap for responsive front-end design, and modern Rails frameworks like Hotwire (Turbo + Stimulus) for seamless, reactive user experiences.

With 10+ years of Ruby on Rails expertise, I don’t just build applications—I engineer scalable, maintainable systems that solve real business problems. My journey began as a curious developer tinkering with Rails, and over the years, I’ve evolved into a problem-solver who bridges technical complexity with business value. One of my proudest achievements was optimizing multi-tenant database migrations by 75%, introducing rigorous security checks, automated code analysis, and comprehensive test coverage—ensuring reliability at scale. I’ve also turbocharged report generation by refining ActiveRecord queries and leveraging PostgreSQL optimizations, slashing load times while maintaining data integrity. Beyond coding, I thrive on efficiency and reusability. When integrating third-party APIs, I don’t just glue them together—I built my own Ruby gem to encapsulate logic, making future integrations faster and cleaner. Staying ahead of the curve is second nature: I run a weekly tech newsletter to keep my team (and myself) updated on Rails, Hotwire, and PostgreSQL advancements, ensuring we’re always leveraging the best tools. What truly sets me apart is my blend of deep technical skill and strategic thinking. I don’t just write code—I architect solutions that are secure, performant, and maintainable, while mentoring teams to raise the bar collectively. If you need a developer who ships high-quality software and elevates those around them, let’s talk. 🚀

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Principal Engineer, Senior Engineering Manager, Tech Leadership – Building Ruby on Rails applications at scale since 2006

I scale codebases, teams, and engineering orgs with clean code, clarity, and 18 years of Rails experience. Principal Engineer, Senior EM, or CTO’s right hand — I lead where impact matters more than process, and where AI amplifies good judgment, not noise. What sets my work apart is a balance of architectural thinking, hands-on delivery, and human awareness. I care about outcomes, but never at the expense of people. My leadership style combines high expectations with real support — I listen closely, give clear feedback, and help engineers grow in ways that align with who they are and what the product needs. Over the years, I’ve built and scaled backend systems, led distributed teams, and modernized legacy-heavy applications without slowing the pace. From performance bottlenecks to product architecture, I enjoy navigating complexity and bringing focus, quality, and momentum to engineering efforts. Whether building a monolith that stays lean or untangling years of shortcuts, I work deliberately and with long-term clarity in mind. Autonomy, ownership, and product-context drive how I operate. I do best in environments where engineers are trusted to think, not just execute — where direction is clear but not prescriptive, and where decisions are made close to the problem. I don’t believe in bloated processes or performative work. I believe in building systems and cultures that work for humans. Engineering is a craft, not a checklist. I ask questions. I challenge vague thinking. I push for naming things well, testing the things that matter, and removing the things that don’t. I’ll protect a team when needed and challenge it when it drifts. That mix of empathy and edge is where I thrive — and where I try to help others do the same. AI is part of my toolkit, not my identity. I use it to reduce noise, boost clarity, and sharpen decisions. Done right, it gives small teams leverage — not distractions. If you’re looking for someone who combines technical depth with clear thinking, empathy, and bias for action — let’s talk. Specialties Engineering leadership, system architecture, Ruby on Rails, PostgreSQL, REST and GraphQL APIs, performance optimization, team scaling, product-minded engineering, test automation with RSpec and TDD, distributed teams, Shape Up, CI/CD, mentoring, hiring, and remote collaboration.

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