Job Summary: FAIRSON is seeking a C# Developer to design, evolve, and maintain internal applications within a dynamic and collaborative environment. Key Highlights: 1. Participate in the full application lifecycle. 2. Work in a dynamic and growing environment. 3. Collaborate within a development team closely aligned with end users. Founded in 1995 and headquartered in Challans—45 minutes from Nantes—**FAIRSON** specializes in inventory outsourcing. We operate across France and internationally for a diverse client base including retail chains, manufacturers, and key accounts. The quality of our interventions, our teams’ expertise, and our ability to tailor our services to our clients’ needs have established us as a recognized player in a growing market. Within this context, the development and evolution of our internal tools play a critical role in our organization and performance. As a C\# Developer, you will participate in the design, evolution, and maintenance of our internal applications used by our teams in France and internationally. You will be involved throughout the entire application lifecycle, contributing to the reliability, performance, and continuous improvement of our tools, ensuring they meet the needs of operational and support teams. Based in Spain, you will work closely with the development team located in France. ***MAIN RESPONSIBILITIES*** You will join a development team that maintains direct contact with internal users. Therefore, your responsibilities will include: **Application Development** * Design, develop, and maintain C\# / .NET applications across various environments; * Develop solutions meeting defined requirements, specifications, and internal standards; * Adapt existing functionalities to user-identified needs; * Ensure quality, performance, and reliability of developed solutions; * Participate in integration and updates of FAIRSON solutions. **Maintenance and Technical Support** * Diagnose and resolve anomalies reported by users; * Ensure both evolutionary and corrective maintenance of applications; * Provide technical support and collaborate with internal teams to track incidents; * Draft and maintain technical documentation; * Contribute to managing and tracking requests (ticketing system). **Continuous Improvement** * Identify development needs and propose functional or technical optimizations; * Participate in optimizing application performance and reliability; * Contribute to simplifying and improving existing processes; * Participate in technology monitoring and sharing of best practices. ***IDEAL PROFILE*** Are you rigorous, solution-oriented, and motivated by meaningful work? This position is for you if: * You hold a higher education degree in computer science (development or information systems); * You have at least 3 years of IT development experience (including at least 1 year with C\#); * You are proficient in C\#, SQL, and the .NET ecosystem (knowledge of .NET MAUI is an advantage); * You understand end-user challenges and constraints, whether in operational or support teams; * You thrive in a collaborative environment and enjoy teamwork; * You demonstrate rigor, autonomy, and the ability to manage multiple projects simultaneously; * You are committed to continuous improvement and development quality; * You possess strong spoken and written French (French-speaking professional environment). ***WHAT WE OFFER*** * A dynamic and growing environment in France and across Europe; * Concrete projects tied to our field operations and internal tools; * A development team closely aligned with end users; * A collaborative workplace where ideas are encouraged; * An environment that values versatility, responsibility, and progress. If you are organized, communicative, and capable of managing multiple tasks, we invite you to apply. **Please submit your CV (in Spanish or French)** and a cover letter highlighting your key competencies to **RH@fairson.fr** We look forward to welcoming you to our team! Employment Type: Full-time Salary: 29\.000,00€\-30\.000,00€ per year Benefits: * Company phone * Meal vouchers Experience: * C\#: 1 year (Required) Language: * French (Required) Work Location: On-site