Senior Data Scientist (m/f/d)

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Senior Data Scientist (m/f/d) based in France. This role offers the opportunity to build and improve machine-learning products operating at exceptional scale within the digital advertising ecosystem. You will work with large, complex datasets and models processing billions of ad requests and users in real time. The position spans the full data science lifecycle, from research and experimentation through production deployment and continuous optimization. You will collaborate closely with data scientists, analysts, and machine learning engineers to develop scalable solutions with measurable business impact. Your work will directly contribute to improving product performance, customer outcomes, and the efficiency of programmatic advertising systems. The environment is international, highly collaborative, experimentation-driven, and focused on solving complex problems with practical machine learning. This is an opportunity for an experienced data scientist to work on challenging problems while having meaningful technical and commercial impact.