Freelancer profile translated to English.
Back to original languageAbout Youenn
Ruby on Rails Developer | Expert SaaS & Product Engineering
I support tech companies and software publishers in the design, evolution, and performance of their platforms. My approach goes beyond just writing code: I integrate a strong product sensibility to transform your business challenges into scalable and maintainable technical solutions.
Technical Expertise & High Availability
Specializing in the Ruby on Rails ecosystem, I work on high-traffic infrastructures. Notably, I was technically responsible for a platform handling over 3 million daily requests (Captivate), ensuring total stability and continuous optimization of data flows.
Migrations & Stack Modernization
Managing technical debt is central to my interventions. I secure the growth of your SaaS by managing Ruby and Rails version upgrades (Expertise Rails 8 / Ruby 3.3 / YJIT) with a rigorous methodology guaranteeing 'zero downtime' and measurable performance gains.
Areas of Intervention:
Product Engineering & SaaS: Development of complex features with a user vision (Drakkr, Captivate).
Critical Migrations: Framework upgrades, legacy code refactoring, and deployment security (Steeple).
Architecture & Backend: Data modeling (PostgreSQL, TimeScaleDB) and background job management (Sidekiq Enterprise).
Teaching & Standards: As a teacher at Le Wagon, I apply industry best standards (Clean Code, Automated Tests, CI/CD).
Based in Lorient, I work exclusively remotely. I am your technical partner to build a robust, scalable application.
Let's discuss your project's architecture or your next migration.
French
Native or bilingual
English
Fluent
Remote only
Primarily works remotely
Experience
- Steeple
On Malt
RUBY 3.3 + RAILS 8 MIGRATION - STEEPLE STACKSOFTWARE PUBLISHINGFebruary 2026 - March 2026 (1 month)Lorient, FranceSteeple, an internal communication platform for companies, required a major upgrade of its backend infrastructure to improve performance and benefit from the latest Rails framework innovations.Progressive Ruby & Rails UpgradeRuby 3.1 → 3.3.10: YJIT activation (+20% performance)Rails 7.0 → 7.1 → 7.2 → 8.0.4: 3-step migration to minimize risksMethodology AppliedProgressive strategy: 3 separate deployments (Rails 7.1 → 7.2 → 8.0) for problem isolationExhaustive testing: Full RSpec validation at each step before deployment✅ Zero downtime: Progressive deployment without service interruption✅ Performance: +15-25% thanks to YJIT and Rails 8 optimizations✅ Compatibility: PostgreSQL 15+, Sidekiq Enterprise, entire stack modernized✅ Maintainability: Up-to-date framework, reduced technical debtRuby 3.3.10 • Rails 8.0.4 • PostgreSQL 15 • Sidekiq Enterprise • Grape API • Docker • AWS EC2 • Automated CI/CDNeed a Rails expert for your critical migrations?Available for similar missions: Rails/Ruby upgrades, API refactoring, performance optimizations. - CaptivateFull-Stack Ruby on Rails Developer - Technical LeadSOFTWARE PUBLISHINGJune 2022 - Today (4 years)Lorient, FranceAs the sole technical person in the company, I took over the maintenance and development of a custom content streaming platform (news, weather, sports results, horoscopes, fun facts) delivered as feeds (XML, RSS, JPEG).Operational maintenance of the API (approx. 3M requests/day)Development of new products & designsClient communication (support)Environment: Ruby on Rails, Sidekiq, AWS
- OVHFull-Stack Developer (Ruby on Rails | Vue.JS)SOFTWARE PUBLISHINGJune 2021 - June 2022 (1 year)Rennes, FranceWithin an HR BU Tech team (4-5 people), contributed to the development of a custom web application to interface with existing tools, as part of the company's HRIS migration.- Scoping of features to be developed in different batches- Technical design- Feature development- Operational maintenance (MCO)- Communication with stakeholders
Reviews
Recommendations
+1
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Education
- Fullstack ProgramLe Wagon2020Un bootcamp de 9 semaines intensives, passées à apprendre Ruby, HTML, CSS, Bootstrap, JavaScript ES6, SQL, git, GitHub, CleverCloud and Ruby on Rails. J'ai également acquis des connaissances en design de produit tech en développant un clone d'AirBnB (type marketplace) et en développant une application sous Ruby on Rails d'automatisation des tâches de gestion de projet, intégrant l'API de l'outil Trello.
- Master Grande EcoleRennes School of Business2019J'ai suivi un parcours spécialisé en management de l'innovation au cours duquel j'ai pu acquérir des compétences: - En gestion de projet: Project Management, Information Technology Fundamentals, Knowledge Management, Management of Change. - En stratégie: Competitive Strategy, Strategic Management, Strategic Management of Innovation. - En marketing: Marketing of Innovation, Digital Marketing and Branding, Customer Experience Management. - En finance: Financial Analysis, Corporate Finance Fundamentals, Financing New Venture. Ces compétences me permettent aujourd'hui d'avoir une réelle compréhension des enjeux de mes clients et de délivrer des solutions qui répondent à leurs besoins.
Certifications
- Web Application Designer-Developer CertificationLe Wagon2020