Freelancer profile translated to English.
Back to original languageAbout Antonin
🚀 .NET Engineer | Mobile (MAUI / Xamarin) & Backend Architecture Expert
I assist companies and software publishers in designing critical applications,from software architecture to store deployment.
My approach combines the rigor of backend engineering (**Clean Architecture, DDD**) with a fine mastery of the mobile user experience.
🎯 My Areas of Intervention
📱Expert Mobile Development (.NET MAUI / Xamarin)
- Design of high-performance cross-platform native applications.
- Advanced native integration: Handlers, Background Services, In-App Purchases, GPS.
- UI/UX: Adherence to Apple/Google guidelines and faithful implementation.
☁️Backend & Cloud Architecture (ASP.NET Core)
- Creation of robust and secure RESTful APIs (JWT).
- Modular architecture: **Clean Architecture**, **Microservices**, **CQRS**.
- **Cloud Engineering (GCP)**: Deployment on Cloud Run, event-driven architectures (Pub/Sub), Cloud Tasks.
- Data management: MySQL, Entity Framework Core.
🛠Quality & Industrialization (DevOps)
- Maintainable and testable code.
- Implementation of CI/CD and deployment automation.
🏆 Why work with me?
1. Expertise Proven by Open Source
I am the author of`Gravity.GoogleMaps`,a NuGet library used by+4000 developersworldwide. This demonstrates my ability to produce reliable, documented, and reusable code.
2. The "Complete Product" Vision
I designed and deployed theDuoapplication (50+ screens) in production, managing complex issues (Offline Synchronization, Real-time, Subscriptions). I don't just deliver code, I deliver a finished product.
Technical Stack:.NET 8/10, C#, MAUI, Xamarin, ASP.NET Core, SQL Server, Google Cloud Platform (GCP), Docker, Git.
French
Native or bilingual
English
Fluent
Remote only
Primarily works remotely
Experience
- Gravity AppsExpert .NET Engineer & Mobile Architect (Freelance)SOFTWARE PUBLISHINGFebruary 2024 - Today (2 years and 4 months)Tours, FranceUnder the entityGravity Apps,I operate as an independent engineer to design and develop critical solutions in.NETand.NET MAUI.I bring my clients the expertise of a senior software architect with the flexibility of a freelancer, involved throughout the entire lifecycle: from technology selection to production deployment.Achievements & Technical Expertise:📦Open Source & High Engineering (.NET)
- Author of the`Gravity.GoogleMaps`package suite (4000+ downloads): Reference library for the Google Maps API.
- Challenges: Design of a type-safe Fluent API, defensive validation, and exhaustive unit tests (> 95% coverage). Concrete proof of my quality standards.
📱Native Mobile Expertise (.NET MAUI)- Development of high-performance cross-platform applications (iOS/Android).
- Design of an internal technical foundation (MAUI Framework) to accelerate "Time-to-Market": navigation, dynamic themes, and optimized state management.
☁️Backend & Cloud Native (ASP.NET Core / GCP)- Architecture of secure RESTful APIs (Authentication, RBAC).
- Deployment and orchestration onGoogle Cloud Platform(Cloud Run, Pub/Sub, SQL).
- Industrialization of development processes (CI/CD, Docker).
Added Value:A "Craftsmanship" approach ensuring sustainable, testable, and scalable code, reducing the technical debt of your projects.Skills:.NET 8/10 | C# | MAUI | ASP.NET Core | Google Cloud Platform | Software Architecture - Duo CompanyCo-owner, Full-stack DeveloperSOFTWARE PUBLISHINGJanuary 2024 - Today (2 years and 5 months)Tours, FranceI co-foundedDuo**, a mobile application for dancers, allowing them to discover **dance eventsand learnbachata and kizomba stepswith experienced artists.On this project, I designed and developed **the entire product**:
- 🧱 **Backend**: Secure REST API (.NET 8, EF Core, Firebase Auth, JWT, roles)
- 📱Mobile Frontend**: Native **.NET MAUIapplication (Android & iOS), published on the stores
- ☁️ **Cloud**: Hosting on **Google Cloud (GCP)**, tracing and monitoring
- 🗄️ **Database**: MySQL with DDD-oriented schema
- 🔒 User management, referrals, levels, and progression
- 🚀 Deployment, management of TestFlight / Google Play Console builds
Links:🌐 https://duo-dance.com📱 Play Store: https://play.google.com/store/apps/details?id=com.duocompany.duoandroid🍎 App Store: https://apps.apple.com/fr/app/duo-cours-danse-%C3%A9v%C3%A8nement/id6749142377
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Education
- From Zero to Hero: REST APIs in .NETDometrain2025https://dometrain.com/course/from-zero-to-hero-rest-apis-in-asp-net-core
Certifications
- Google Play Store Listing CertificateGoogle Play2025