Senior/Staff Fullstack Engineer, Backend Leaning

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Senior/Staff Fullstack Engineer, Backend Leaning based in France. As a Senior/Staff Fullstack Engineer, you will play a key role in building and scaling innovative AI-powered SaaS products that transform how businesses communicate and operate. This role combines deep backend expertise with fullstack capabilities, giving you ownership over complex projects from concept through delivery. You will work closely with product teams to solve meaningful commercial challenges, shape product direction, and deliver impactful features to a global customer base. Operating in a high-performing engineering environment, you will influence technical decisions, improve engineering practices, and help build systems designed for scale, reliability, and long-term growth.