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Charles J.CJ

Charles J.

Expert React Native, Automation & AI

€490/day
Paris, FR
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Charles

Hello,

With a dual background, technical (42 School) and commercial, I am a developer passionate about creating digital products that have a real impact.
My goal is not just to deliver code, but to transform your vision into a high-performing, profitable solution perfectly aligned with your business objectives.

I support entrepreneurs and companies, from startups in the launch phase to major CAC 40 groups, in realizing their ambitions.

My areas of expertise:
  • Expert mobile development with React Native: creation of robust, high-performance cross-platform (iOS & Android) applications with a polished user experience.
  • SaaS platform architecture and launch: design of scalable and secure web solutions, from the initial idea to production.
  • Integration of artificial intelligence and automation: whether to enrich your applications with intelligent features or to optimize your operations, I integrate AI solutions and automate your processes to increase your efficiency and relevance.
  • Product strategy and support: thanks to my business school education, I help you challenge your idea, define your MVP, and build a coherent product roadmap.

My background and references:

After two years of experience as a research engineer in a large IT consulting firm, I had the opportunity to collaborate with prestigious clients such as Saint-Gobain, TripAdvisor, Colas, and Safran, as well as numerous startups.

My work method:
  • Pragmatism: We get straight to the point to deliver value quickly.
  • Communication: Constant alignment to ensure the final product perfectly matches your expectations.
  • Long-term vision: I build sustainable solutions, designed to evolve with your company.
  • French

    Native or bilingual

  • English

    Fluent

Remote only
Primarily works remotely

Experience

  • Theodo Apps
    Web and Mobile Research Engineer
    SOFTWARE PUBLISHING
    June 2022 - September 2024 (2 years and 3 months)
    Paris, France
    Roles: Tech Lead

    Companies: Saint-Gobain, TripAdvisor, Colas, Safran

    I had the opportunity to adopt a rigorous methodology based on Lean management principles, which allowed me to continuously improve my work environment.

    Skills and achievements:

    Optimization of production processes and business workflows
    Precise planning and risk management
    Technical validation of design mockups
    Iterative development with frequent testing and refactoring
    Collaboration with product experts
    Continuous integration and strict adherence to standards

    Methodology:
    Through time-boxing, I refined my time management skills to ensure project efficiency and stakeholder satisfaction.
    React Native
  • 42
    Student
    EDUCATION AND E-LEARNING
    November 2019 - Today (6 years and 7 months)
    Paris, France
    Latest project:
    Development of an online multiplayer game with Ruby On Rails

    Other notable projects:
    - Development of an HTTP server in C++ based on Nginx
    - Installation of a LEMP stack with Docker
    - Setup of a service infrastructure with Kubernetes

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Education

  • Digital Computer Architect
    42
    2021
  • General Business Degree - Master 2 Grande Ecole
    Normandy Business School
    2019

Skill set (22)

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