This position is listed on behalf of a partner company, which manages all applications and next steps. Our partner is looking for a Middle Software Engineer (Ruby on Rails) based in France. As a Middle Software Engineer, you will contribute to the development and maintenance of a mission-critical content platform powering an innovative e-commerce and advertising technology ecosystem. You will take ownership of core backend systems, delivering roadmap features from conception through production while ensuring reliability, scalability, and code quality. Working within an engineering-driven, international team, you will help maintain essential services for content processing, merchant administration, and workflow automation. You will also embrace an AI-first development approach, using coding agents to accelerate delivery, improve software quality, and make existing systems easier for AI tools to maintain. Alongside feature development, you will support production operations, troubleshoot issues, and contribute to continuous improvements in engineering practices. This fully remote opportunity is ideal for a developer who enjoys solving complex technical challenges, taking ownership, and exploring the future of AI-assisted software engineering.