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Jérôme S.JS

Jérôme S.

Lead Developer expert JS fullstack and algorithms

€790/day
Paris, FR
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Jérôme

Engineer by training (Polytechnique), I have been developing in various languages since the age of 12. My training and experience have given me the rigor necessary to successfully carry out many complex projects.

In addition to developing applications in record time while respecting the best web and mobile standards, I always strive to advise my clients on the strategic issues they encounter, such as SEO, security, user experience, data valorization, or architecture scaling.

I always work with agile methodology; it is essential for me to progress in close collaboration with my clients and iteratively. I will ensure that each stage of development perfectly matches your vision. And I am committed to being 100% transparent in my work throughout the development process.

Main projects completed:
- Engie R&D — Development of several software for forecasting and optimizing complex decisions with high financial stakes (methane tanker routes, pipeline network construction, contract pricing, ...).
- mysphair — Design and implementation of data analysis algorithms to exploit indoor air quality measurements.
- hoplabon — Design, development, and deployment of an iOS & Android application, a backend, and a backoffice for a food product sales service via recipes.

I am currently focusing on missions:
- Design and development of complex algorithms
- Data analysis and exploitation
- Fullstack JavaScript development with technologies like React.js, React Native, Node.js, Redux, Mobx, react-router, SQL, MongoDB, Apollo, GraphQL, ...

Tell me about your project, I respond very quickly 👋
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  • English

    Fluent

  • French

    Native or bilingual

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

Experience

  • hoplabon
    CTO & Developer
    E-COMMERCE
    February 2017 - Today (9 years and 4 months)
    Fullstack development of applications:
    - Android & iOS mobile application in React Native (MobX, Apollo)
    - Node.js backend (Stripe, MongoDB, GraphQL, AWS, Heroku, Web services)
    - Web back office interface (HTML, CSS, JavaScript, React, Boostrap)
    React.js React Native Node.js MobX GraphQL Apollo MongoDB Amazon Web Services Stripe Heroku HTML5 Bootstrap CSS JavaScript Firebase CodePush Mailjet
  • ENGIE
    Project Manager
    ENERGY AND UTILITIES
    April 2013 - January 2017 (3 years and 10 months)
    Technical lead on various IoT projects:
    - measurement of electricity and gas consumption of a home and display on a website
    - connected thermostat for gas boiler with mobile application
    - short-term interruption of electric heaters and hot water tank in case of power outage on the grid
    - indoor air quality analyzer with alert and advice mobile application
    Cassandra MongoDB Node.js SQL PHP Ionic Cordova
  • ENGIE
    R&D Engineer
    ENERGY AND UTILITIES
    September 2009 - March 2013 (3 years and 7 months)
    Development of several software for forecasting and optimizing complex decisions with high financial stakes (methane tanker routes, pipeline network construction, contract pricing, ...).
    c# C++ CPLEX Operations Research

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Education

  • Engineer
    Polytechnique
    2008
    Spécialisation en informatique et recherche opérationnelle (optimisation)
  • Statistician Engineer
    ENSAE Paris
    2009
    Analyse de données et machine learning

Skill set

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