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Sébastien RousseauSR

Sébastien Rousseau

Full-Stack Ruby on Rails & React Developer

€450/day
Marseille, FR
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Sébastien

Full Stack Ruby on Rails & React Developer – 4 years of experience in designing complex business applications

Specializing in the development of ERP and custom applications, I assist companies in digitalizing their business processes.
My expertise
Backend: Ruby on Rails, PostgreSQL, Sidekiq, Redis, REST API
Frontend: React, Next.js, Vue.js, TypeScript
Methods: Agile/Scrum, TDD, code review, scalable architecture
Field experience
Full Stack Developer & Product Owner (2 years in permanent contract)
Design and development of a complete ERP for High Society:

Technical architecture from A to Z (inventory management, orders, accounting, logistics)
Collection of business needs and product prioritization
Integration of third-party APIs and performance optimization
Delivery in 2-week agile cycles
Personal projects
Development of an MRP calculation engine for industrial planning
Modular architecture and API/frontend separation
What I bring to your projects
✅ Product vision + technical skills
✅ Ability to transform business needs into concrete solutions
✅ Autonomy on end-to-end full stack projects
✅ Maintainable, tested, and documented code
Available for freelance work on your business application projects, custom ERPs, or technical overhauls.
  • French

    Native or bilingual

  • English

    Conversational

Can work on-site
Marseille (up to 50km)

Experience

  • Solya
    Co-Founder - Full-stack Developer
    SOFTWARE PUBLISHING
    July 2024 - July 2025 (1 year)
    Aubagne, France
    Design of an industrial ERP/MRP system (personal project)
    Development from scratch of a production management and material requirements planning solution for the manufacturing industry.

    - Complete technical architecture: API/frontend separation, management of dependencies between modules
    - Development of an MRP calculation engine adapted to industrial planning constraints
    - Definition of development standards (automated tests, code review, documentation)
    - Design of a scalable architecture intended to evolve with business needs

    Stack: Ruby on Rails 7, PostgreSQL, Sidekiq, Redis, Next.js, TypeScript, Docker
    The project was not commercialized but allowed me to deepen my skills in complex system architecture and algorithmic calculation applied to industry.
    Next.js Ruby on Rails Docker Git Business Creation
  • High Society
    Full-stack Developer
    LOGISTICS AND SUPPLY CHAIN
    April 2022 - July 2025 (3 years and 3 months)
    Marseille, France
    Development and maintenance of a custom ERP
    Design and evolution of a complete business application to digitize all company operations: inventory management, customer orders, accounting, and logistics.

    - Collection of business needs and definition of product priorities
    - Full-stack development in 2-week agile cycles
    - Integration of third-party APIs (accounting, logistics, e-commerce)
    - Performance optimization (SQL queries, Redis cache, Vue.js components)
    - Skill progression towards Lead Developer: technical architecture, stack choices, development standards

    Stack: Ruby on Rails 6, Vue.js 2, PostgreSQL, Sidekiq, Redis, Heroku
    Ruby on Rails Vue.js Heroku Git GitHub
  • Le Wagon Marseille
    Assistant Professor
    INTERNET OF THINGS (IOT)
    November 2021 - January 2022 (2 months)
    Marseille, France
    Assisting Le Wagon bootcamp students in their web development learning. Daily technical support (Ruby on Rails, JavaScript, SQL), code review, debugging assistance, and coaching on final projects. Strengthening my teaching skills and ability to simplify technical concepts.
    JavaScript Ruby on Rails HTML5 PostgreSQL

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Education

  • Certification
    Le Wagon
    2021

Skill set

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