Sébastien S.
Fullstack Developer
He co-founded Le Wagon in 2014 and served as CTO for 10 years, scaling the company from a bootstrapped startup in Paris to a global coding bootcamp with over 30,000 alumni trained in Web Development and Data Science. As a technical leader, he built and managed a team of more than 20 engineers and data scientists, driving product innovation and creating an in-house Ruby on Rails platform to power the bootcamp’s operations.
Sébastien is recognized for his ability to deliver the right product, combining technical excellence with strategic vision.
Main expertise
Ruby on Rails13 years
Ruby13 years
SQL18 years
JavaScript18 yearsExperience4
CTO & Co-founder
- Co-founded Le Wagon in 2014 to teach technical skills to creative professionals.
- Led the company’s technical vision and product development as CTO.
- Built and managed a cross-functional team of 20+ developers and data scientists.
- Designed and maintained the in-house Ruby on Rails platform that supported all bootcamp operations.
- Scaled Le Wagon from Paris to 40 cities across 25 countries.
- Oversaw continuous improvements to Web Development and Data Science curricula.
- Contributed to the growth of a global community of over 30,000 alumni.
JavaScript
MongoDB
PostgreSQLRubyRuby on Rails
Senior Software Engineer
- Served as Full-stack Lead Developer on MobiCheckin, a SaaS platform for event organizers.
- Led the integration of third-party APIs including Mandrill, Mailchimp, Highrise, Esendex, and Xing Events.
- Developed core features using Ruby on Rails and JavaScript.
- Contributed to the product’s rebranding and evolution as EventMakers.
JavaScriptMongoDBPostgreSQLRubyRuby on Rails
Software Engineer
- Designed, implemented, and tested the flagship product Voice of the Customer in collaboration with in-house data scientists.
- Contributed to core feature development using C# and JavaScript.
- Implemented best practices through a comprehensive code refactoring initiative.
JavaScript
C#SQL
ASP.NET
DevOps
Visual Studio
Software Engineer Intern
- Built web analytics tools to visualize the internal network structure and status.
- Developed interactive dashboards using Python and C++.
JavaScript
Python
C++SQLAssessments
Engineering excellence
Sébastien’s overall performance in a 90-minute live technical assessment ranks in the top 5% of vetted Fullstack Developers at Proxify.
Portfolio
Highlighted by Sébastien
1Kitt is Le Wagon’s all-in-one pedagogical platform (built as a Ruby on Rails monolith), designed to power the fast pace of coding bootcamps. It integrates lectures, coding challenges with instant feedback, peer-matching for daily collaboration, flashcards for review, and structured project workflows, all in a single environment. By combining structure, collaboration, and immediate feedback, Kitt supports active, hands-on learning while reducing friction for both students and instructors. Graduates keep lifetime access, making it a long-term resource beyond the bootcam
Education
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