Freelancer profile translated to English.
Back to original languageAbout Jérémy
💻 Senior Ruby on Rails Developer | Backend & APIs Specialist
👋 Hello, I'm Jérémy, a freelance web developer for 3 years with 7 years of Ruby on Rails experience and 4 years in PHP/Magento.
I specialize in the maintenance, optimization, and refactoring of existing Rails applications for startups, SMEs, and local authorities.
🚀 What I can do for you
✅ Maintenance and refactoring of legacy Rails applications (version upgrades, technical debt)
✅ Development of robust and scalable backend and REST/GraphQL APIs
✅ Performance optimization (SQL queries, Sidekiq, Redis caching)
✅ Integration of external APIs and business workflow automation
✅ Data migration and database transformation (PostgreSQL, MySQL)
✅ Automated testing (RSpec, Capybara) and CI/CD (GitHub Actions, GitLab)
✅ Deployment and infrastructure (Heroku, Docker, Cloudflare)
🎯 Why collaborate with me:
✓ 7 years of Ruby on Rails expertise + 4 years PHP/Magento
✓ Specialist in legacy applications: I understand technical and business challenges
✓ 3 years as a freelancer: autonomous, reliable, clear communication
✓ Available full remote or hybrid (travel to Grand Est/Paris possible)
📈 Recent example
Refactoring and optimization of a Rails application for a local authority: Rails 5 → 7 migration, 60% reduction in API response time, implementation of automated tests.
📅 Available immediately
💬 Contact me on Malt to discuss your project!
👉 Book a meeting here: calendly.com/jeremy-pestelard/30min
French
Native or bilingual
English
Conversational
Can work on-site
Troyes (up to 50km)
Experience
- WebmakerComposphèreENVIRONMENTALJanuary 2025 - Today (1 year and 5 months)Creator of Composphère (composphere.app), a SaaS solution developed in Ruby on Rails, designed to simplify the management of composting sites. Composphère centralizes data, facilitates field monitoring, and improves the traceability of organic waste, while adapting to the specific needs of local authorities and operators.https://composphere.app
- Webmaker
On Malt
Freelance - RoR / Ruby Backend DevelopmentMarch 2022 - Today (4 years and 2 months)Freelance web developer – Ruby on Rails specializationCreation of complete backend applications with Ruby on Rails, including high-traffic sites and custom platforms.Development of online contests and specific systems for marketing needs.Improvement and maintenance of existing APIs to optimize performance and enhance features.Evolutionary and corrective maintenance of e-commerce and showcase websites developed in Ruby on Rails.Creation of showcase websites under WordPress for clients seeking a simple and manageable solution.Regular interventions on existing projects: audit, debugging, refactoring, and continuous improvement. - Place2SwapBack Ruby on Rails DeveloperE-COMMERCEJanuary 2022 - March 2022 (2 months)Lyon, FranceDevelopment of features / bug fixes on the E-Commerce platformSpree: RoR / Erb / jQuery / Rest API
Reviews
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Education
- BTS in Management Information Technology, Application Developer OptionLycée Franklin Roosevelt de Reims2012
- Baccalaureate in Management Information TechnologyLycée Marie de Champagne - Troyes2010