Julien Renaux, Software Developer in Toulouse, France
Julien Renaux

Software Developer in Toulouse, France

Member since April 7, 2015
Julien is a senior front-end engineer with experience working for startups and multinationals across the world. Julien is a former Google developer expert for the web and a Certified Scrum Master. He spends most of his free time writing on his blog, working on open source projects, and organizing conferences.
Julien is now available for hire




Toulouse, France



Preferred Environment

Stencil.js, Angular, TypeScript, React, Visual Studio Code, Git, MacOS, Docker, Web

The most amazing...

...thing I've developed is definitely my work related to Open Banking at Forgerock, helping developers and banks across the world.


  • Lead Front-end Engineer

    2020 - PRESENT
    • Migrated https://www.cigarscanner.com PWA to Ionic and capacitor, managed to keep 4+ stars rating while increasing traffic (several thousand users a day).
    • Created back-office PWA platform to manage stocks with Angular Material.
    • Automated builds, tests, and releases using Docker images on Azure.
    Technologies: Angular, Capacitor, Progressive Web Applications (PWA), PWA, Ionic
  • Lead Front-end Engineer

    2018 - 2020
    ForgeRock Open Banking Team
    • Created an open banking sandbox (bank, directory, OAuth, analytics) using an Angular monorepo.
    • Created a full-stack TPP app to demonstrate TPP's capabilities.
    • Implemented Unit Tests with Jest.
    • Implemented E2E tests with Cypress.
    Technologies: Angular, TypeScript, Cypress.io, Jest, RxJS, Redux
  • Lead Front-end Engineer

    2017 - 2018
    CDX Limited (Cryptocurrency Exchange)
    • Architected and designed two large-scale apps.
    • Created reusable UI components.
    • Implemented reusable Redux containers.
    • Implemented internationalization (i18n) with react-intl.
    • Wrote modules for Jest Unit, Snapshot, and end-to-end testing.
    Technologies: Babel, Webpack, ES7, ECMAScript (ES6), Redux, React
  • Lead Front-end Engineer Rakuten Games

    2016 - 2017
    • Created reusable UI components on a large-scale app.
    • Implemented reusable Redux containers.
    • Implemented internationalization (i18n) with react-intl.
    • Developed Jest Unit and Snapshot testing.
    Technologies: Babel, Webpack, ES7, Emacs, Redux, React
  • React Software Engineer

    2016 - 2016
    CNES (French Space Agency)
    • Implemented a performance improvement of an existing React application (Reselect, Immutable).
    • Created reusable UI components on a large-scale app.
    • Implemented reusable Redux containers.
    • Developed Jest unit and snapshot testing.
    • Contributed to the React Stockcharts library.
    Technologies: Babel, Webpack, ES7, ECMAScript (ES6), Electron, Redux, React
  • Software Engineer, Architect

    2015 - 2016
    Core Metabolics
    • Architected a cross-platform AngularJS/Ionic application.
    • Created the web platform using Angular Bootstrap.
    • Created the mobile app with Ionic framework.
    • Worked on server infrastructure installation.
    • Worked on StormPath integration on the client side.
    • Implemented internationalization (i18n) with angular-translate.
    Technologies: Stormpath, ECMAScript (ES6), Webpack, AngularJS
  • Software Engineer

    2012 - 2015
    Living Objects
    • Developed a rich JavaScript application using AngularJS, Angular Material, and Node.js.
    • Created a platform that monitors access provider networks using jQuery, CoffeeScript, PHP5 (Symfony2), and Bootstrap 3.
    • Led the SVN-to-Git transition.
    • Implemented quality processes, including unit tests, merge requests, code review, and CI via Jenkins.
    Technologies: JavaScript, Webpack, jQuery, CSS, HTML, PHP, AngularJS, Node.js
  • Software Engineer

    2010 - 2012
    eBay, Inc.
    • Worked on a web analytics platform for internal information sharing (17,000 employees) based on Joomla.
    • Led a multinational team (10 members globally) as a Certified Scrum Master.
    • Developed components/modules/widgets for Joomla.
    • Administrated the continuous integration platform using Jenkins.
    • Acted as the GitHub enterprise administrator.
    • Created the JavaScript framework + UI library used in the project.
    Technologies: JavaScript, MooTools, CSS, HTML, Joomla, PHP


  • Julien Renaux Blog

    For years I have been sharing thoughts and tips about front-end engineering.

    Also available on Android: https://play.google.com/store/apps/details?id=com.shprinkinc.wordpresshybridclient

  • Isitblackfridayyet

    Every day, get a reminder whether it is Black Friday or not. This product was created as a joke and took the internet by storm!

    Learn about the journey and the technologies used on:

  • Ionic 2 vs. Ionic 1: Performance Gains, New Tools, and a Big Step Forward (Publication)
    The Ionic project is rapidly gaining in popularity and is one of the most popular open source projects worldwide. With the recent announcement of the stable version of Ionic 2, this is the perfect time to underscore the Ionic 2 and its predecessor. In this post, Toptal software engineer Julien Renaux outlines the major changes Ionic 2 brought to the platform and explains how to put these new features to good use.
  • The 9 Most Common Mistakes That Ionic Developers Make (Publication)
    Ionic is extremely popular at the moment, and it has revolutionized the hybrid application industry in a way that nobody could have imagined. However, over time, the best practices and tooling for Ionic have not progressed in the same way. As a result, the number of pitfalls that developers need to look out for when working with Ionic is still high. In this article, Toptal Freelance Software Engineer Julien Renaux outlines the most common mistakes that Ionic developers should know.


  • Languages

    TypeScript, CoffeeScript, JavaScript, ECMAScript (ES6), PHP, Sass, Less, HTML5, HTML, CSS, ES7, SQL
  • Frameworks

    Angular, Redux, Ionic, Jest, Jasmine, Electron, Cypress.io, React Native, PHPUnit
  • Libraries/APIs

    React, jQuery, MooTools, Node.js, RxJS, Firebase Web SDK, Facebook API, GitHub API
  • Tools

    Git, Webpack, Jenkins, Babel, Gulp.js, Stencil.js, Emacs, PostCSS
  • Paradigms

    Mobile Development, Cross-platform, Scrum
  • Platforms

    Firebase, Android, Linux, WordPress, Joomla, MacOS, Visual Studio Code, Web, Docker, iOS
  • Other

    Software Development, Capacitor, Single-page Applications (SPA), Mobile App Development, Hybrid Apps, Cordova, PWA, Front-end, Progressive Web Applications (PWA)
  • Storage

    MySQL, MongoDB


  • Master's degree in Computer Science, Big Data
    2010 - 2011
    Tongji University - Shanghai, China
  • Master's degree in Computer Science, Programming
    2006 - 2011
    Telecom Lille - Lille, France


  • Santander's Hackathon Winner
  • Google Developer Expert
    MARCH 2019 - PRESENT

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