Freelancer profile translated to English.
Back to original languageAbout Francis
Senior Ruby on Rails Developer with 7+ years of experience in designing and developing B2B and SaaS web applications with high business value. Backend expert with in-depth mastery of REST APIs, complex business logic, and automated testing (RSpec). Varied experience in web agencies, startups, and entrepreneurial projects, with an approach focused on code quality, maintainability, and system reliability. Recently completed cybersecurity training (Red Team / Blue Team), bringing increased awareness to application security.
French
Native or bilingual
English
Fluent
Can work on-site
Paris (up to 10km)
Experience
- Projet personnelRuby on Rails Developer - Personal project – vinsurvin wine SaaS applicationMay 2025 - Today (1 year and 3 months)Design and development from scratch of a SaaS inventory and POS management application (Rails 8, API + web interface architecture).Complete business modeling: products, inventory, sales, payments with transactional management ensuring data consistency.Dynamic interface with Stimulus/Hotwire; RSpec automated test coverage on all critical business rules.Online demo (client beta version) → vinsurvin.onrender.com
- JedhaCybersecurity TrainingJanuary 2025 - April 2025 (3 months)FranceIntensive Red Team & Blue Team training: security audit, incident analysis, application vulnerabilities (OWASP Top 10).Practice on Root-Me (active challenges): continuous development of penetration testing skills.
- TUNES-STORYCo-founder & Ruby on Rails DeveloperJuly 2023 - April 2024 (9 months)Paris, France▸ Design and development of a collaborative music sharing web application (MVP launched in production).▸ Robust backend architecture with PostgreSQL; dynamic interface via Hotwire (Turbo/Stimulus) and Bootstrap.▸ Unit and integration test coverage with RSpec, reaching +80% on critical business models.
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Education
- Web Developer Training CertificateWild Code School2015
- Cybersecurity CertificationJedha2025Formation de cybersécurité
Certifications
- Fullstack CybersecurityJedha2025