Nicolas COUSIN

📚 In parallel with client work, I’m actively developing and structuring my freelance business: 👨‍💻 Strengthening my C# and .NET expertise through personal technical projects 🌐 Continuous learning on Next.js and TypeScript to enhance my frontend development skills 🧱 Building my company website, showcasing services and integrating DevOps automation 🎓 Designing the training course “From IDE to Cloud”, a complete DevOps journey from local development to cloud deployment 🤝 Volunteer work: redesign of the parent-teacher association’s website using Next.js 🔍 Ongoing tech watch and exploration of freelance opportunities focused on .NET, CI/CD, Cloud, and Clean Architecture

École IT – Brussels Campus (3 days) Intensive training for second-year students specialising in .NET development. Main topics covered: - Modern C# - Building a Minimal REST API with EF Core - Introduction to Blazor Server - Final practical work in a Docker / devcontainer environment - Supporting documentation and materials provided Teaching approach: - Real-time adaptation to the group’s level - Alternating between key concepts, live coding, and guided hands-on exercises

Directorate-General for Competition, Consumer Affairs and Fraud Control (DGCCRF) – C# / .NET Technical Workshop (3 days) Assignment carried out for technical teams at the French Ministry for the Economy. Topics covered: - Modern C# (record, init, pattern matching, async/await, etc.) - Architecture of a .NET 8 Minimal API (dependency injection, middleware, Serilog) - Introduction to CQRS using MediatR and Channel - Implementation of a Clean Architecture adapted to .NET - Step-by-step demonstration of .NET Aspire - API containerisation with Docker, using docker-compose to integrate logging with Seq - Introduction to BDD using Reqnroll - Modular architecture and focus on code testability Additional technical insights: - Presentation of devcontainers to standardise development environments - Quick demo of F# to highlight the diversity within the .NET ecosystem Approach: - 100% live coding format - Real-time content adjustments based on participant interaction and needs

🔧 Short-term intervention on-site, acting in “firefighter mode” to update and document an old business application that had not been maintained for years. The system is used on interactive kiosks with RFID readers. 🎯 Objective: Modernize and stabilize a legacy codebase while ensuring hardware compatibility. ✅ Technical challenges: • Migration from .NET Framework 4.6.1 → 4.8 (due to vendor DLL for RFID reader) • Migration from .NET Core 3.1 → .NET 8 • Web backend with background services • React frontend (Node 14) • Kiosks with mini-PCs running MySQL and communicating with RFID readers (serial port) • Full documentation of the system (previously nonexistent), partly written with GitHub Copilot • DevContainer setup to simplify frontend development environments 🚀 Outcome: A clean, tested, and documented migration branch ready for integration by the internal team. 📦 Delivered via Portalia (freelance umbrella company) 📌 This type of short-term, high-impact mission is now offered directly via Nicolas Cousin Tech Solutions

3-day on-site training in Rouen, delivered as a subcontractor for Artza Technologies. Audience: in-house developers at Assystem. Explained and implemented key concepts: SOLID, DDD, CQRS, Mediator, Entity Framework Core Updated training materials by replacing obsolete SpecFlow with Reqnroll to ensure up-to-date content Designed a hands-on project to support practical learning Received excellent feedback from participants on both content and delivery quality

Enhanced the configuration tool for the Dommages aux Biens application, proposing a HATEOAS system to drive the ReactJS frontend. - API built using ASP.NET Core 3.1 with hexagonal architecture. - Unit and integration tests carried out with Xunit and SpecFlow (BDD with Gherkin).

Worked within the IARD Entreprises team to migrate a fleet management application to Azure. Led the remediation by redesigning it into a REST API hosted on Azure. - Analyzed the existing application and proposed a remediation solution. - Designed the REST API architecture. - Migrated the application to Azure and implemented CI/CD pipelines on Azure DevOps. - Participated in practice communities (Software Craftmanship, Cloud, .NET).