Scroll To View More
Benjamin Mayrargue, C# Developer in Paris, France
Benjamin Mayrargue

C# Developer in Paris, France

Member since August 9, 2013
Benjamin is a seasoned app developer and entrepreneur. He has worked with three startups as CTO and with one as managing director. He excels at both managing groups of developers and at working on solo projects.
Benjamin is now available for hire



  • C#, 13 years
  • Xamarin, 4 years
  • .NET Core, 2 years
Paris, France



Preferred Environment

Microsoft Visual Studio

The most amazing...

...thing I've created is Shapr, a professional networking app on iOS/Android.


  • Freelance Developer

    2011 - PRESENT
    • Created the "Cosmo Connected" iOS+Android apps and the .NET Core middle-tier API.
    • Created the "Vfr Tracks" iOS app.
    • Created the Android app.
    • Created a WPF installer for a public software pack for a major retailer.
    • Taught Xamarin and other Microsoft technologies in training centers.
    • Created the defunct gaming website and its back-office.
    Technologies: Xamarin .NET Core
  • Lead Developer

    2000 - 2008
    Free SAS (ISP)
    • Created an advanced web search engine named ""
    • Built a captive portal for children.
    • Converted and upgraded a cinema website from PHP and MySQL to C# and T-SQL (
    • Created a video back-end system for VOD streaming, including automatic video validation and transcoding.
    • Created an engine to manage parallel mass execution of tasks written in C# and running in isolated domains.
    Technologies: C#, ASP.NET, T-SQL, C++
  • Developer

    1998 - 2000
    Institut Francais du Pétrole (Previously D2T)
    • Worked with Microsoft Foundation Classes and Advanced Template Libraries.
    • Evolved a tool used to view and measure the cycle of a motor engine in real-time.
    • Found an algorithm to automate manual calibration in an angular cycle.
    • Registered the profile for a flame of a special spark plug for Peugeot Sport.
    Technologies: C++ MFC


  • Cosmo Connected (Development)

    Cosmo is the first connected brake light. I created both the Android and iOS apps using Xamarin native. The app communicates with the Cosmo device through Bluetooth LE (light effects, crash detection, firmware update). The app also tracks the GPS position of the user in real time.

    I also created the .NET Core API back-end on Linux.

  • Vfr Tracks (Development)

    The Vfr Tracks mobile app tracks the position and flight parameters of tourist aircrafts in real time. It creates maps of your flights that you can share with your teams. I created the mobile app in Xamarin iOS native from scratch, consuming the middle tier API already used for the website.

  • XamSvg (Development)

    A vector graphics library for Xamarin iOS, Android, WP, and XamForms.

    The resolution of retina screens was a revolution. With each increase of pixels per inch on mobile phone screens, developers have to create new images for each new resolution, increasing the workload and the application weight.

    SVG vector graphics are very small files describing an image mathematically through lines and curves. They can change their size and resolution without any pixelization. There is no app performance degradation at all, as the device GPU knows how to accelerate these renderings.

    This library allows you to change just one file in order to change your icons. Additionally, the component supports pressed states and color remapping, so one SVG image file is enough.

  • Speaker at Mobile Conference at IBM Headquarters (Other amazing things)

    I spoke at the mobile conference in November, 2013, in Paris, France at IBM headquarters. I demonstrated how to use C# to code an Android app and an iOS app, and how to reduce code duplication up to 80% by using a cross-platform library. I also demonstrated Windows phone apps, a Windows 8 store app, and a Mac store app.

  • Shapr Personal Networking (Development)

    Developed mobile applications (Android, iOS), evolutions, and other updates.

    Gave advice on app content and design and gave support on design tools.

    Recruited, managed, and trained additional external developers to support fluctuating workloads (up to 4).

    - Full Xamarin C# platform-specific technology.
    - Device independent vector graphics dramatically reduced the time lost testing and fixing graphics on multiple devices.
    - Used my own component XamSvg available on component stores.
    - Integrated LinkedIn Connect, Facebook Analytics, Google Analytics, and AppsFlyer.

  • (Development)

    An app that I wrote to program and execute actions when a phone is near an NFC "tag." Examples include exchanging a VCard, connecting to WiFi without needing a password, sending an SMS, and more.


  • Languages

    C#.NET, SQL, C#, C++
  • Frameworks

    .NET Core, .NET, JSON Web Tokens (JWT)
  • Libraries/APIs

    Xamarin.iOS, Xamarin.Android, Deezer API
  • Paradigms

    Concurrent Programming, Design Patterns
  • Platforms

    Xamarin, Visual Studio 2017, Microsoft Azure Mobile Services, Visual Studio Code
  • Other

    Xamarin Forms, Google Pub/Sub, Crash Fixing, Windows Presentation Foundation (WPF)
  • Tools

    WiX Installer, Azure Mobile, Trello, Slack, Bitbucket, Git


  • Master 2 degree in Artificial Intelligence
    1995 - 1995
    Jussieu University (Paris 6) - Paris, France
  • Master of Science degree in General Engineering
    1990 - 1995
    Esme Sudria High School - Paris, France
I really like this profile
Share it with others