Benjamin Mayrargue

Led the complete takeover, modernization, and relaunch of an existing digital platform, covering mobile applications, back-end services, APIs, database architecture, and operations.

• Revamped and relaunched two cross-platform iOS and Android applications using Expo and React Native.
• Took ownership of the legacy PHP 7 back end and redesigned the entire mobile API and administration back office.
• Migrated and deployed services on Kubernetes with Docker-based infrastructure.
• Extended and optimized the MariaDB data model, introducing Google and Apple authentication as well as new business workflows.
• Reworked Stripe integrations for payments and subscriptions while eliminating paid third-party dependencies.
• Improved map-related user experience and implemented automated server-side image generation.
• Set up CI/CD pipelines, crash reporting, and managed iOS and Android in-app purchase integrations.

Technologies: Expo, React Native, PHP 7, MariaDB, Kubernetes, Docker, Stripe, OAuth, Google Sign-In, Sign in with Apple, CI/CD, In-app Purchases.

Acquired a company in liquidation, I audited the existing mobile app codes written in Swift and Kotlin. I modernized the codebase, fixed bugs, and developed an Apple Watch app, ultimately publishing the updated apps to the Google Play Store and Apple App Store.

Kavale is an autonomous hardware security device designed to track horses and detect falls using LoRaWAN long-range networks. It also prevents horses from leaving the field and detects if they remain still for extended periods.

• Created the Woundzoom mobile apps from scratch with custom controls, iPad support, AD authentication support, and security-oriented local storage.
• Developed the 3D wound detection and acquisition algorithms and the test bench system.
• Created the release build pipelines, linked the bug reporting service, and set up and linked the REST API instant log server.

I developed leisure aviation Android and iOS mobile apps that can track the position and flight parameters of small aircraft in real time using Xamarin Native. Within the apps, you can create live stream maps to share 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 operating system versions (Android 5-10, iOS 10-13) and a Facebook-style loading state animation.

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.

An enterprise-level wifi network analysis tool dedicated to wifi planning 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 many issues with wifi deployments.

This app for Android/iOS uses a USB Wi-Spy Air device (plugged into 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 3st 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 using a C++ library in five languages. 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, and a private API. It also 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 or 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#.

I wanted to support the fight against COVID-19, and my contribution was to lead the development of the Mon geste en + application for IFEP, a non-profit organization.
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 that can validate QR codes for the police forces. Both applications are open-sourced to ensure security and privacy.

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 to both developers and customers.

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

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 the third version of the Android/iOS mobile apps and implemented the evolutions and various updates over the next two years. I advised on app content and design and supported design tools. I recruited, managed, and trained additional external developers to support the fluctuating workload.
For this project, I used my own XamSvg component and full Xamirin C# platform-specific technology. 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. I also demonstrated Windows phone apps, a Windows 8 store app, and a Mac App Store app.

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