C# Developer in Paris, France

I wanted to support the fight against the Covid-19 and my contribution was to lead the development of the Mon geste en + application, for a non-profit organization IFEP.
My extra gesture application is developed to protect people around you and reduce the number of new cases, by recording daily the people with whom you have close contact. Additionally, I created my own app which can validate QR codes for the police forces. Both applications are open-sourced, to ensure security and privacy.

I created Vapolia's website in 2008. using ASP.NET 4 and jQuery, which used to run inside a Windows virtual machine over KVM/Proxmox (a Linux/Debian host hypervisor) on a dedicated server on OVH Cloud. I set up and upgraded the whole cluster myself and now it runs inside Linux Docker image, containing the ASP.NET Core runtime, deployed in a Kubernetes cluster (on OVH Cloud) using a Helm script.

I created a unique, affordable, and easy to use offline licensing system, a XamSvg plugin for the Xamarin SDK, that can save time and give more flexibility for both developers and customers.

Earlier, with each increase of pixels per inch on mobile retina screens, developers had to create new images for each new resolution, increasing the workload and the application weight. But now with SVG vector graphics (which are describing an image mathematically through lines and curves) they can change their size and the resolution without any pixelization.

I developed leisure aviation Android and iOS mobile apps that can track the position and flight parameters of small aircrafts in real time using Xamarin Native. Within the apps, you can create your live stream maps that can be shared with your teams and followers. Both apps are available in English and French and feature an infinite smooth scrollable newsfeed style using an asynchronous pageable API which supports SignalR for live streams, push notifications, deep links, and background state management on all devices and OS versions (Android 5.0-10, iOS 10-13) and a Facebook-style loading state animation.

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 a lot 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 a 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/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 motorcycles. I built the whole architecture for 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.
Applications also feature a real-time, 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 an OAuth2 client, a public API front, a MySQL database, scheduled tasks using Google Cloud PubSub, a private API, and it exchanges data with the eCommerce website.

I made Android/iOS apps that configure NFC tags (small and cheap stickers that can be integrated into all sorts of products). After configuration, the tags will trigger actions when a phone is in their near field. For complex actions, the applications should be installed, but they don't have to run in the background, nor they require an internet connection. The apps feature easy UIs to read and write complex actions to any NFC tag, limited only by the memory available in the tag.
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.
I designed and implemented Bluetooth LE communication to a private flight device to get more flight data.
To propose changes and improve performance, I analyzed the exchanges between the app and the API server, which was a legacy ASP.NET web API and also upgraded parts of the web API to a new version. Additionally, I worked on the DevOps by setting up continuous integration and automatic build-in the cloud and I trained an Indian developer. The app itself had heavy technical debt, written in an old version of Xamarin.Forms, but now it uses the latest technologies, had many of its bugs and inconsistent behaviors fixed, and is much quicker to react to user actions.

I created the first versions of the Android/iOS mobile apps and in the next two years I was implementing the evolutions and various updates. 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 the fluctuating workload.
For this project, I used my own XamSvg component, full Xamirin C# platform-specific technology and I also integrated LinkedIn Connect, Facebook Analytics, Google Analytics, and AppsFlyer.
Device-independent vector graphics dramatically reduced the time lost, by testing and fixing graphics on multiple devices.

I spoke at the Appdays.fr mobile conference, which was held at IBM’s headquarters in Paris in November, 2013. I demonstrated how to code Android/iOS apps using C# and how to reduce code duplication up to 80% by using a cross-platform library. Windows phone apps, Windows 8 store app, and Mac App store app were demonstrated, as well.

Radio is an Android/iOS application, which can play most radio streams in their highest quality and has an exclusive second volume level slider for a fine tuning in very quiet places. It uses ExoPlayer on Android and on iOS the low-level audio subsystem and features customizable skins and a brushed UI.