Freelancer profile translated to English.
Back to original languageAbout Frédéric
# Senior Full-Stack Developer C# .NET & Java J2EE | Software Architect & DevOps Expert
Looking for a reliable, autonomous developer capable of delivering a turnkey web or software solution?
With 10 years of experience as a full-stack developer, I am Frédéric Hirn, an expert in designing and delivering robust and scalable web and software solutions (API, SaaS, business applications).
🚀 My core expertise focuses on the stacks:
- Robust Back-end (C# / .NET Core including ASP.NET MVC, RESTful APIs and Java J2EE Including Spring, Spring Boot, Hibernate)
- Front-end:Ergonomic development with Angular, TypeScript / JavaScript, HTML/CSS and Bootstrap integration. I ensure an optimal experience.
- Databases:Expertise in modeling and query optimization on SQL Server, PostgreSQL and MySQL.
- DevOps & Tooling : Mastery of the DevOps environment (CI/CD, Docker,hostingmanagement), as well as development tools like Postman. I bring expertise in architecture and technical scoping.
- Maintenance, Evolutions, and Long-Term Support
🎯 What my clients appreciate:delivering clean, maintainable, and performant code, on time and within budget, autonomously.
✅ For whom? SMEs, Startups, Software Vendors, or IT departments seeking specialized technical support and a long-term partner for C# .NET Fullstack and Java Fullstack technologies.
English
Fluent
Spanish
Conversational
Japanese
Basic
French
Native or bilingual
Can work on-site
Strasbourg (up to 50km), Mulhouse (up to 50km), Saverne (up to 50km)
Experience
- TripalioFull-Stack Developer C#/.NET FreelanceBANKING AND INSURANCEApril 2026 - Today (2 months)Strasbourg, FranceDesignanddevelopmentof the **AIService (Triparator)**: automated extraction and interpretation of collective insurance guarantees using artificial intelligence, from PDF documents and the Tripalio API.
- Development of an AI-powered extraction pipeline: calling a generative AI model with an expert system prompt to transcribe and structure PDF pages into usable JSON (intelligent OCR, relevance filter per page, multi-column reading)
- Modular architecture based on IExtract / IInterpret interfaces tailored to the type of health benefit (dental, optical, audiology): extraction of raw values then business interpretation of guarantees
- Fine extraction of coverage amounts, reimbursement rates, ceilings, allowances, and coverage conditions
- Integration of the Tripalio API for retrieving collective agreement data by CCN and APE code
RESULTS OBTAINEDAutomation of guarantee extraction previously handled manually | Structured data usable for compliance and contract comparison | Modular and extensibleAI pipelinefor new benefit typesStack used:Back-End:C# / .NET Core / Entity Framework Core / RESTful APIAI: LLM integration (generative AI in vision), system prompt engineeringData: JSON / RESTTools:Git, Visual Studio, Claude Code - Kuhn💼 Full-Stack Web Developer C#/.NET FreelanceMECHANICAL ENGINEERINGFebruary 2021 - November 2025 (4 years and 9 months)Saverne, FranceDevelopment of high-stakes business web projects (supplier management, PIM, IT system migration) for the supply chain and internationalization within Kuhn Group (international agricultural machinery)
- Development and maintenance of the supplier portal, a critical system for managing supplier relationships, orders, and supply chain procurement
- Lead of the AS400 → SAP ERP technological migration, modernizing internal systems for robustness and compatibility, with database migration to SQL Server
- Design and development of the Kuhn PIM application for multilingual management of product labels, including product back-office, translation management, and validation workflow
- Close collaboration with business teams for integration into the existing ecosystem, respecting business constraints and strong involvement in architecture
- Delivery of modern, documented code compliant with standards, ensuring maintainability, scalability, and reduced total maintenance cost
RESULTS OBTAINEDIncreased modernization and reliability of internal systems | Improved performance and scalability | Multilingual PIM facilitating product management and internationalization | Business continuity and guaranteed supply reliability🧰 Stack used:
Back-End:C# / ASP.NET / ASP.NET MVCFront-End:Angular, Javascript, TypeScript, JQuery, RazorDatabase:SQL ServerTools:Azure DevOps - EFOR💼 Full-Stack Web Developer C#/.NET FreelanceFebruary 2021 - September 2021 (7 months)Project carried out for Kuhn Group via EFOR (international agricultural machinery), as part of the development and maintenance of high-stakes business web projects.
- Development and maintenance of the supplier portal, a key tool for managing supplier relationships, orders, and procurement
- Participation in the technological migration of AS400 services to SAP for modernization of internal systems
🧰 Stack used:Back-End: C# / ASP.NET / ASP.NET MVCFront-End: AngularJSDatabase: SQL ServerTools: Azure DevOps
Reviews
Mickael
développements .Net / C# pour application gestion asso sportive - PLURIWEB
Reviewed on 5/21/2026
Excellent work from Frédéric, attentive throughout the project and able to accurately translate expressed needs into adapted technical solutions. Thank you for this work!
L
Léo
Développeur .net et IA - Asfelia
Several days project
-
Reviewed on 4/20/2026
Frédéric is very professional and invested a lot in understanding the challenges and the "business" environment of our project. His technical skills combined with his listening and attention are an asset for working on complex subjects that involve, in particular, the use of artificial intelligence.
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Education
- Master 2 Earth, Universe and Environmental SciencesUniversité Paris Sud (Paris XI)2012Sédimentologie - Géophysique - Géochimie
- Java J2EE TrainingINTI Formation (ADAMING)2016Formation au JAVA J2E, Hibernate, Spring, JSF, JSP, PrimeFaces et MySQL