C# Developer in Colombes, France

An enterprise-level wifi network analysis tool dedicated to wifi planification and maintenance. It captures low-level wifi packets and frequency using a scanner to create a map of your wifi network, compare it later for maintenance, and detect lots of issues with wifi deployments.

This app for Android/iOS uses an USB "Wi-Spy Air" device (plugged in the lightning port for iOS) and features real-time update of all fields in all "opened" screens using a reactive software architecture, and correctly manages all the background states of any Android or iOS version.

The apps are connected to a back end through an API. It features user registration and connection, enterprise level connection, reporting of wifi snapshots, and categorization in sites/rooms (autocompletion fields).

The USB connection is managed by a C/C++ library.

Cosmo is the first connected safety brake light for motocycles. I built the whole architecture: Android/iOS apps using Xamarin Native, secure and documented APIs in .NET Core for Linux/Debian on Google Cloud, MySQL schema and queries, and worker microservices plugged into the existing Drupal back end.

The app communicates with the Cosmo device through Bluetooth LE. It features a strong light, intelligent crash detection, real-time GPS position reporting, fail-safe crash reporting to loved ones and paid assistance. Technically both apps can update the device firmware.

Both apps also features real-time and offline voice command recognition in five languages using a C++ library. The firmware update stack for the BLE device is written in pure C#.

The API back end has these microservices: an OAuth2 client, a public API front, a MySQL database, scheduled tasks using Google Cloud PubSub, and a private API. It exchanges data with the eCommerce website.

These Android and iOS mobile apps, dedicated to leisure aviation, track the position and flight parameters of small aircrafts in real time. The app creates maps of your flights that you can share with your teams or livestream to your followers (like your instructor).

I created both mobile apps (using Xamarin Native). The apps use an API which supports SignalR for live streams, push notifications, and deep links, and background state management on all devices and OS versions (Android 5.0-10, iOS 10-13).

It is available in English and French.

Both apps feature an infinite smooth scrollable "news style" feed using an asynchronous pageable API and a Facebook-style loading state animation.

This Android and iOS app configures NFC tags, which are small stickers with a chip, like those used to protect merchandise in clothing stores.

After configuration, the tags will trigger actions when a phone is in its near field. For complex actions, the app must be installed, but it does not need to be running.

The app features an easy UI to read and write complex actions to any NFC tag, limited only by the memory available in the tag. It does not need an internet connection to work.

The NFC stack is written in pure C#.

Upgraded a large and technical iPad app written three years ago, dedicated to helicopter pilots, which registers specific flight parameters and is aimed at replacing the manually written flight reports.

Analyzed the exchanges between the app and the API server, which was a legacy ASP.NET web API, to propose changes and improve performance. Implemented the changes and also upgraded parts of the web API to a new version.

The app has heavy technical debt, written in an old version of Xamarin Forms. It now uses the latest technologies, has many of its bugs and inconsistent behaviors fixed, and is much quicker to react to user actions.

I also worked on the DevOps by setting up continuous integration and automatic build in the cloud, and trained an Indian developer in best practices.

Finally, I designed and implemented Bluetooth LE communication to a private flight device to get more flight data.

I created the first versions of the mobile apps for Android and iOS, and then I implemented the evolutions and other updates for two years. I gave advice on app content and design as well as support on design tools. I recruited, managed, and trained additional external developers to support a fluctuating workload of up to four devs.

- 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.

A vector graphics library for Xamarin iOS, Android, UWP (Windows), and Xamarin Forms.

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 pixelation. 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.

I spoke at the Appdays.fr 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 App Store app.

Radio is a radio app for Android and iOS.

It features customizable skins and a brushed UI. It is capable of playing most radio streams in their highest quality and has an exclusive second volume level slider for fine tuning in very quiet places.

On Android, it uses ExoPlayer. On iOS, it uses the low-level audio subsystem.

I created this website in 2008 in ASP.NET 4 and jQuery. I used it as a template to check the upgrade paths for these technologies:

ASP.NET MVC 4 and Aspx (2012)
ASP.NET MVC 5 and razor (2014)
ASP.NET Core 1.0 (2016)
ASP.NET Core 2.0 (2017)
ASP.NET Core 2.1 (2018)
ASP.NET Core 2.2 (2019)
ASP.NET Core 3.0 and Blazor (2019)

This website is running inside a KVM virtual machine on a dedicated server on a host provider. The virtual orchestrator used is Proxmox on Debian 9. I am the sole manager for the server and its security.

I have successfully set up and tested a Kubernetes cluster on this machine, and I'm planning to move Vapolia.fr in the cluster, using a .NET Core Linux image and helm.