Freelancer profile translated to English.
Back to original languageAbout Arnaud
Fullstack Tech Lead .NET / Go / React — Build, Refactor, and Take Over Code
I support startups, SMEs, and product teams in designing and delivering robust, performant, and maintainable applications.
With 10+ years of experience, I work on projects involving new builds from scratch, application refactoring, and code takeovers, using .NET, Go, and React.
References: Cdiscount, Sage, Eurotunnel.
Expertise: microservices, performance, resilience, observability.
50+ projects delivered, from MVP to core business applications.
My approach: needs audit → transparent quoting → clean and documented delivery → frictionless handover. You retain control over the code and progress.
Available for Full Remote. Response within 1 hour. First consultation free.
French
Native or bilingual
English
Fluent
Remote only
Primarily works remotely
Experience
- EurotunnelFullstack Tech Lead .NET Core (C#) / ReactTRANSPORTATIONDecember 2022 - Today (3 years and 8 months)Technical lead on critical systems integrated into the European EES (Entry/Exit System) project for modernizing EU external border control within Eurotunnel.
- Design and development of EES Zone Management (EZM), a central interface for managing French/British zones composed of 15+ resilient and observable microservices.
- Development of innovative microservices extending the tracking capabilities of trucks carrying goods across the Channel, with technical modernization of vehicle tracking components.
- Development of BusControl (tablet application for real-time planning of freight loading teams) and BoardingPax (tool for passenger crews with loading plans).
- Development of Camera Loader, an embedded ANPR (Automatic Number Plate Recognition) system for real-time vehicle tracking.
- Development of EWallet, a secure digital wallet for customs documents (passports, veterinary certificates).
- Technical leadership with enhancement of security, traceability, and resilience approaches within a demanding European regulatory framework.
- Implementation of automated testing, CI/CD, and monitoring via Grafana/Prometheus.
Technologies: C#, .NET 6-10, React, TypeScript, Material UI, Azure (Functions, Service Bus, Key Vault, App Services, AKS, SQL, Storage, Insights), Kafka, gRPC, Kubernetes, Docker, Gherkin, SpecFlow, ReqnRoll, XUnit, TUnit, Mock, REST, PubSub, Grafana, Prometheus - Tech-MagisterFounder & Tech ArchitectNovember 2016 - Today (9 years and 9 months)FranceTech company serving the leaders of VSEs/SMEs and startups, we design and deliver tailor-made digital solutions that transform their operational constraints into performance levers.
- Complete development of business applications focused on intelligent automation and simplification of human work.
- Modern fullstack stack: .NET Core, Go, React, Generative AI (LLM), third-party APIs.
- Clear approach: free audit → transparent quoting → delivery in 4–6 weeks → continuous follow-up.
Concrete example:For 3IE, a real estate appraisal firm, we designed a complete solution that:- Automatically aggregates data from cadastral, geolocation, and third-party APIs.
- Analyzes photos via AI to detect property condition, materials, and anomalies.
- Generates a structured appraisal report with assisted writing.
→ Saves 8 hours compared to manual report writing, without loss of quality.Our goal: to offer SMEs the same technical rigor as in large corporations (Cdiscount, Eurotunnel), but with agility, transparency, and business focus. - SAGESenior Fullstack Developer .NET Core (C#) / ReactSOFTWARE PUBLISHINGJune 2021 - December 2022 (1 year and 6 months)Progressive modernization of accounting and management solutions used by 2+ million users in France for SAGE (accounting software publisher).
- Corrective and evolutionary maintenance of a critical internal application developed under .NET Framework 4.8, used daily by product and support teams.
- Strategic consulting on the transition to a modular microservices architecture for long-term technical evolution planning.
- Design and implementation of a real-time POC (SignalR/WebSockets) enabling simultaneous multi-user collaboration on documents — a key feature for future collaborative modules.
- Progressive modernization approach without disruption for complex systems with a large installed base.
Technologies: .NET Framework 4.8, .NET Core, C#, React, SignalR, WebSockets, Docker, Microservices Architecture, Real-time
Recommendations
These freelancer profiles also match your criteria
Agatha Frydrych
Backend Java Software Engineer
4.7
(3)
2
Baptiste Duhen
Fullstack developer
4.6
(4)
5
Amed Hamou
Senior Lead Developer
4
(2)
7
Audrey Champion
Web developer
4.3
(3)
4
Education
- IT and Robotics Project Manager, Computer EngineeringMediterranean Institute of Study and Research in Computer Science and Robotics (IMERIR)2014Chef de projet Informatique et Robotique, Ingénierie informatique