**Nombre de vacante** Senior Software Engineer (French Speaker) **Descripción** We are looking for a highly skilled Senior Software Developer to design, build and deliver high\-quality, scalable and robust features within our products. In this role, you will contribute to complex technical decisions, drive engineering excellence and work closely with Product Management, QA and other teams to shape solutions that truly meet customer needs. As a senior member of the team, you will act as a technical leader—mentoring developers, improving processes and promoting best practices while continuously staying up to date with modern tools and technologies. Since this position specifically supports the French market, fluency in French is mandatory to ensure accurate understanding of functional and regulatory requirements and effective communication with stakeholders. If you are passionate about solving challenging problems, delivering customer\-focused solutions and elevating engineering standards, we would be delighted to meet you. **Responsabilidades principales** Apply broad and deep software engineering expertise to deliver complex and high\-impact features. Design, develop and maintain high\-quality software, including requirements, architecture, coding and documentation. Collaborate early with Product Managers to shape solutions that are flexible, extensible and robust. Stay current with relevant technologies and automate tasks through appropriate tools and scripting. Evaluate progress, identify improvements and recommend changes to processes or technical approaches. Act as a technical thought leader, driving innovation, clarity and strong engineering practices. Partner effectively with cross\-functional teams (Product Management, QA/XD, other product lines) to deliver outcomes. Mentor and coach junior developers, contributing to their growth and to positive team dynamics. Ensure all work meets quality standards, including clear documentation, testing and adherence to best practices. As this role supports the French market, ensure accurate understanding of functional and regulatory requirements—fluency in French is mandatory. Essential Skills - C\#, .NET Core (preferred) / .NET - Strong experience with Web APIs. - Fluent in French and advanced in English. - Strong understanding of software engineering best practices, patterns and architectures. - Solid experience with CI/CD pipelines, unit testing and automation. - Deep knowledge of Agile development practices (Scrum, XP, TDD, pair programming, etc.). Desired Skills - Experience with Web Services. - Cloud technologies such as Azure or AWS. - Experience contributing to technical strategy or architecture discussions. At Sage, we offer you an environment where you can grow professionally without compromising your personal well\-being. Our benefits package is designed to provide stability, flexibility, and balance: Flexible benefits: exchange part of your salary and make tax savings on health insurance, meal and transport vouchers, childcare, and training. Well\-being: Free access to the Calm app (for up to 5 users), 24/7 counselling, and emotional support from our Healthy Mind Coaches. We also offer self\-care and parenting resources through the Cleo app. Flexible working: flexibility of working one hour in, one hour out, shortened workdays on Fridays and during the summer, and the opportunity to work from over 40 countries for up to 10 weeks per year through our Work Away program. Annual leave: 23 working days of vacation, 5 paid days per year for volunteering, and 5 additional paid days annually for personal or professional development. Extended leave: 7 extra days of maternity leave and 5 extra days of paternity leave, on top of the legal allowance, available after one year of service. Financial support: Life and disability insurance, salary advances of up to 3\.5 times your net monthly pay, a €300 net marriage bonus, and access to Sage's employee stock purchase plan at a discounted rate. Health and Safety Responsibilities Fostering the safety culture, by leading with your own example. Following established safety procedures and reporting potential hazards promptly helps maintain a secure and efficient workplace. Participating in safety training sessions and adhering to preventive guidelines and procedures, the objective is minimizing risks and protecting yourself and the rest of your colleagues. \#LI\-SL1