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Yann SainsonYS

Yann Sainson

Mobile Developer | React Native & Expo Expert 🚀

€650/day
Paris, FR
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Yann

Passionate about low-carbon travel 🚂, road cycling đŸšŽđŸ», e-sport 🎼... and hot chocolate đŸ«

I am a freelancer, specializing in React Native for several years, with a strong product sense and particular attention to user experience.

Whether it's creating an app from scratch or improving an existing product, my goal is to understand your needs, get to the essentials, and build together a product that meets real-world usage.

If you are looking for a reliable, involved, and attentive human to take your mobile app to another dimension, let's talk! đŸ€

Pssst, as I am CII certified, you can recover 20% of my invoices through the Innovation Tax Credit 💰
  • French

    Native or bilingual

  • English

    Fluent

Can work on-site
Paris (up to 10km)

Experience

  • The Mobile-First Company
    React Native Developer
    TELECOMMUNICATIONS
    May 2025 - Today (1 year and 1 month)
    Paris, France
    Mobile-First helps companies make mobile their central management tool.

    6-month mission to strengthen the mobile team and deliver two key features for the AllĂŽ app:
    • Team Management: Migration of the Store subscription to Stripe, integration of card payments, Apple Pay, and Google Pay, and addition of seats to invite new members
    • Contact Redesign: New design with gesture-based animations and addition of a quick access bar (A-Z) to navigate through a list of several thousand contacts
    React Native Expo Typescript Mobile Application
  • explorz
    React Native Developer
    ENTERTAINMENT AND LEISURE
    May 2023 - May 2025 (2 years)
    Paris, France
    explorz is the app that lets you stop scrolling and have fun outside with your friends 💜

    Rated 4.7 ⭐ by our happy explorers!

    +250K users

    • From scratch development of the entire explorz mobile application
    • Integration of Mapbox V11 with 3D model
    • Management of production deployment on the App Store and Google Play Store
    • Monitoring via Sentry
    React Native Expo Mapbox Typescript Mobile Application
  • May
    CTO & React Native Developer
    BANKING AND INSURANCE
    January 2022 - May 2023 (1 year and 5 months)
    Paris, France
    May offers a unique platform for managing employee benefits in companies. It allows employers to allocate a flexible budget to employees, who can then use it in various categories such as meal vouchers, gift vouchers, and more. Management is simplified and compliant with URSSAF regulations, with automatic reimbursement to users' bank accounts.

    My mission at May is:

    ✅ Recruit the best technical team
    ✅ Develop the product from A to Z
    ✅ Scale from 0 to +100 client companies
    ✅ Distribute €5,000,000 in purchasing power to employees

    But also:

    ‣ Responsibility for the company's technical direction
    ‣ Collaboration with the management team to understand strategic objectives and develop technological strategies aligned with the project's mission and vision
    ‣ Assessment of platform security risks and implementation of rigorous protocols to protect user data (rights and permissions, VPN, sensitive data encryption, HTTPS, Cloudflare Bot Management)
    ‣ Implementation of monitoring and reporting tools to measure and optimize platform performance (Sentry, Datadog, Firebase)
    ‣ Search for technological partnerships to integrate new features into the platform and ensure continuous innovation (Bridge, Stripe, Memobank)
    React Native React.js Typescript Expo Mobile Application

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Education

  • Expert in Information Technology (Master's Degree)
    Epitech
    ‱ Grade Point Average (GPA) : 3.55 / 4 ‱ 12ùme de promotion Paris ‱ 23ùme de promotion France (Top 3%)

Certifications

  • EF SET English Certificate (C1 Advanced)
    Education First
    2019
    English
  • Explore ML Workshop Intermediate Track
    Google AI
    2020
    Machine learning Deep Learning

Skill set

Categories