Overview We're looking for data scientists to help build the next generation of post-training methods for frontier models at Microsoft AI. You'll join a small, high-impact team working across all stages of post-training, with a focus on evaluation design, high-quality training data, and scalable data pipelines for state-of-the-art foundation models. In this role, you'll help turn raw model capability into reliable, aligned, and measurable performance improvements, directly shaping how frontier