Benjamin Mayrargue
Verified Expert in Engineering
C# Developer
Benjamin is a senior developer with extensive experience, given the number of years he's been working in the industry. He invests in startups and ideas, reviews customer projects, designs specs, audits codes, and creates ops manageable code. Benjamin also works on mobile app UI, 3D math calculations, APIs, and back ends—all using C#, AWS, Blazor, Docker, Kubernetes, and Helm.
Portfolio
Experience
Availability
Preferred Environment
Windows, Visual Studio, JetBrains Rider, LoRaWAN
The most amazing...
...and interesting thing I'm running is a Helium LoRaWAN network with onboarded devices, earning crypto tokens on the Solana blockchain.
Work Experience
Developer
Freelance
- Created Wi-Spy Air iOS/Android apps for a Toptal client. This enterprise-level tool analyzes the wifi low-level protocols for planning of wifi deployment and maintenance. It is connected to a backoffice through an API.
- Built "Cosmo Moto" iOS and Android apps along with the microservices API server. The app works with a Bluetooth safety light for motocycles. It detects accidents or falls and automatically calls for emergency help and notifies your loved ones.
- Developed Vfr Tracks iOS/Android apps. Vfr Tracks is a tracker for leisure planes. It can livestream the plane position and flight parameters and browse and display details of publicly-saved tracks and their pictures.
- Programmed Tagzi.me, a defunct NFC tag manager app for Android. The app automates actions based on the scanned wifi tag.
- Created Radio, apps for iOS and Android, capable of playing most radio streams in the highest quality and using a second volume level slider for fine-tuned volume control for very quiet places, such as in bed.
- Taught five-day Xamarin seminars in training centers (10 sessions in two years).
- Created the dealdeouf.com application, including website, backoffice, and tools. Managed a team of four. I was the CTO of the company.
- Helped developers in live sessions through ASP.NET Core discovery and real-world usage, OAuth2 real-world usage, code debugging, and other things.
- Set up a production-grade Kubernetes cluster on bare metal and migrated .NET Core apps, including a Blazor app with a Seq log aggregator and Kibana server. Set up RBAC authentication using Azure AD, Nginx, and Let's Encrypt automatic TLS certificate creation and assignment.
- Integrated (and migrated) Stripe billing to directly sell my own software components on vapolia.eu.
Expert Mobile Developer
Metageek
- Created two Air Viewer apps for iOS and Android, available in the stores.
Expert
Airbus Helicopter
- Added BLE communication protocols to an existing Xamarin Forms app.
Expert Mobile Developer
Cosmo Connected
- Created both Android and iOS apps, available in the store.
R&D Manager
Betclic
- Led a research and development team that handled load testing, international billing, real-time web UI, migrations to ASP.NET MVC, and study of micro architecture.
C# Developer
Telecom Italia
- Worked on an internal search engine using COM objects.
- Created a captive web search portal for kids.
- Created and deployed a transcoding and distribution system of movie files for IPTV.
Experience
Mon geste en + Application
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.
Vapolia
https://vapolia.euXamSvg
https://github.com/softlion/XamSvg-SamplesEarlier, 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.
Vfr Tracks
Wi-Spy Air
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 Moto
https://cosmoconnected.comThe 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.
Tagzi.me
The NFC stack is written in pure C#.
Airbus Helicopter
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.
Shapr Personal Networking
https://shapr.co/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.
Speaker at Appdays.fr Mobile Conference at IBM Headquarters
Radio
Skills
Languages
C#, SQL, C#.NET, C++, C, JavaScript, HTML, CSS
Frameworks
.NET Core, JSON Web Tokens (JWT), .NET, Blazor, Windows Presentation Foundation (WPF), Razor Pages, ASP.NET
Libraries/APIs
Xamarin.iOS, Xamarin.Android, Web API, PubSubJS
Tools
Bitbucket, Git, Azure Active Directory B2C (ADB2C), Trello, Slack, Wix Installer, Helm, Visual Studio, RabbitMQ, JetBrains Rider
Paradigms
Concurrent Programming, Model View Controller (MVC), Design Patterns, Microservices Architecture
Platforms
Xamarin, Azure, Kubernetes, Visual Studio Code (VS Code), Windows, Android, iOS, Amazon Web Services (AWS), Google Cloud Platform (GCP)
Storage
MySQL, SQL Server DBA, Google Cloud, Microsoft SQL Server
Other
Crash Fixing, Xamarin.Forms, WebSockets, Mobile App Development, Social Media Apps, Internationalization, Cloud Infrastructure, MSMQ, Graphics Processing Unit (GPU), Serverless, CTO, Leadership, Technical Leadership, Technical Architecture, Training, iPad, Bluetooth, APIs, USB, Location Tracking, Training & Training Content Development, LoRaWAN
Education
Master's Degree in Artificial Intelligence
Jussieu University (Paris VI) - Paris, France
Master of Science Degree in General Engineering
Esme Sudria High School - Paris, France
Certifications
AWS Practitioner
AWS
ASP.NET Web Developer - Level 3
Pluralsight
Visual Studio 2019 Expert
Pluralsight
Querying Data with T-SQL Expert
Pluralsight
Entity Framework Core Expert
Pluralsight
C# Expert
Pluralsight
Planning Microsoft Azure Solutions - Proficient
Pluralsight
iOS Expert
Pluralsight
iOS Publishing, Distribution, Deployment Expert
Pluralsight
Android Expert
Pluralsight
English Level C1
QIOZ (CECRL)
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