Sébastien S.

Fullstack Developer

Sébastien is a fullstack developer with over 17 years of commercial experience, specializing in Ruby on Rails, JavaScript, and Python, with strong expertise in DevOps practices.

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 Rails
    Ruby on Rails 13 years
  • Ruby
    Ruby 13 years
  • SQL
    SQL 18 years

Other skills

  • MongoDB
    MongoDB 12 years
  • Redis
    Redis 10 years
  • Python
    Python 5 years
Sébastien

Sébastien S.

France

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Selected experience

Employment

  • CTO & Co-founder

    Le Wagon - 11 years 8 months

    • 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.

    Technologies:

    • Technologies:
    • JavaScript JavaScript
    • MongoDB MongoDB
    • PostgreSQL PostgreSQL
    • Ruby Ruby
    • Ruby on Rails Ruby on Rails
    • AWS AWS
    • Redis Redis
    • Python Python
    • SQL SQL
    • Ansible Ansible
    • DevOps DevOps
    • Heroku Heroku
    • GitHub Actions GitHub Actions

  • Senior Software Engineer

    Eventmaker - 1 year 8 months

    • 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.

    Technologies:

    • Technologies:
    • JavaScript JavaScript
    • MongoDB MongoDB
    • PostgreSQL PostgreSQL
    • Ruby Ruby
    • Ruby on Rails Ruby on Rails
    • AWS AWS
    • SQL SQL
    • DevOps DevOps
    • Heroku Heroku

  • Software Engineer

    VirtuOz - 2 years 11 months

    • 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.

    Technologies:

    • Technologies:
    • JavaScript JavaScript
    • C# C#
    • SQL SQL
    • ASP.NET ASP.NET
    • DevOps DevOps
    • Visual Studio Visual Studio

  • Software Engineer Intern

    Google - 8 months

    • Built web analytics tools to visualize the internal network structure and status.
    • Developed interactive dashboards using Python and C++.

    Technologies:

    • Technologies:
    • JavaScript JavaScript
    • Python Python
    • C++ C++
    • SQL SQL

Education

  • MSc.Computer Science

    École Polytechnique · 2004 - 2008

Portfolio

  • Kitt - 1

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