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Lionel Z.LZ

Lionel Z.

Senior Fullstack React React-native Symfony

€660/day
3 projects
Paris, FR
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Lionel

As a senior fullstack developer, I have over 9 years of experience in Symfony and 6 years of experience in ReactJs and 3 years in Nodejs. I also held the role of remote frontend lead dev for a few years for a web agency. My expertise also extends to related technologies such as React Native, GraphQL, SQL (MySQL), Redis, Javascript, Firebase, Rabbitmq, and Node.js, Strapi.

Beyond full-stack development, I specialize in AI-based applications and chatbot development. I have customized LibreChat, built RAG (Retrieval-Augmented Generation) systems, and integrated LLMs (Large Language Models) into various business processes.

My constant technological monitoring allows me to stay up-to-date on the latest advancements in the field. I have had the opportunity to work on various applications and websites, covering different sectors such as real estate, events, food, and health.

I am passionate about creating high-performing user experiences using modern frameworks and libraries. My methodical approach and my ability to collaborate effectively with development and design teams allow me to deliver high-quality results within deadlines.

I am ready to take on new challenges, contribute to innovative projects, and bring my technical and human skills and my experience to achieve the set objectives. I am convinced that my versatility, my solid experience, and my constant desire to learn make me an asset for any ambitious development team.
  • French

    Native or bilingual

  • English

    Fluent

Can work on-site
Paris (up to 20km)

Experience

  • BNP-Paribas
    Senior Front-end Developer React/React-native
    BANKING AND INSURANCE
    July 2025 - Today (11 months)
    Rueil-Malmaison, France
    Within the Savings Retirement Company division, I contributed to the development and improvement of the retirement process in the 'Mon Epargne Entreprise' application (over 800k users).

    - Improvement of the biometric authentication system for the 'Mon Epargne' application (iOS/Android)
    - Integration of a customer event management feature in the backoffice used by support teams.
    - Implementation and writing of unit and integration tests for the mobile app and backoffice with Storybook.
    - Improvement of the accessibility level on the web and mobile application.
    React.js React Native Typescript Storybook Unit Tests
  • OMNIVENTUS
    Lead Developer React Nodejs
    VIDEO GAMES AND ANIMATION
    December 2024 - June 2025 (6 months)
    Paris, France
    Development of a cross-platform arcade mobile game (SwarmCrush) under React Native / Expo.
    • Advanced state management with Redux, Redux-sagas, React Context, and Firestore.
    • Integration of social authentication (Apple, Google, Facebook) and real-time leaderboards.
    • Performance and animation optimization with Reanimated for smooth 60 FPS gameplay.
    • Implementation of a progression system, trophies, and notifications to increase engagement with Firebase Cloud Functions.
    • Error monitoring and management via Sentry.
    • Automated deployment and CI/CD with GitHub Actions, Makefile, and Docker.

    I also designed and deployed LibreChat Enterprise, an enhanced version ofLibreChat**, an open-source platform providing access to various **AImodels (GPT-4o, PaLM 2, etc.) through a unified interface. This customization offers features tailored to business needs: **advanced user management**, administration of **shared files**, permission-based access controls, and a robust administration interface.

    Hosted onchat.omniventus.comvia Digital Ocean, this solution retains all original functionalities (image processing, conversation search, multilingual support) while integrating multi-user collaboration capabilities essential for professional environments.
    Node.js React.js Docker React Native Cursor
  • L'Ecole Française
    Malt logoOn Malt
    Fullstack developer React/Symfony wordpress
    EDUCATION AND E-LEARNING
    October 2023 - December 2024 (1 year and 2 months)
    Levallois-Perret, France
    - Development of PHP cloud functions
    - Bug fixing for the lead acquisition funnel and form (React JS / Docker / PHP / Cloud Function)
    - Writing unit and functional tests for React JS / PHP Cloud Functions / Symfony
    - Supporting marketing teams in implementing their technical needs for acquisition and sales funnels
    - Migration of WordPress functions and APIs to Cloud Functions
    - Modernization of the WordPress business application (customization of plugins and theme)
    - Development of a mobile application for training tracking
    - Integrations of Active Campaign and ZOHO APIs
    - Use of Cursor AI
    Typescript Symfony React.js Docker Wordpress Plugin

Recommendations

Julien GreletJG
Valentino H.VH
Julien Grelet and 1 other person have recommended Lionel

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Education

  • Expert in Information Systems and Software Engineering
    Ingesup
    2016
    Master en système d'information et génie logiciel
  • Ecole 42 Certification
    Ecole 42
    2015

Skill set

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