Principal Applied Scientist

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Microsoft Ads seeks a Principal Applied Scientist to lead scientific direction in ad retrieval, matching, ranking, and generation systems using machine learning and AI. Responsibilities include advancing research in retrieval, ranking, matching, and generative models; training and productionizing SLMs/LLMs; evolving the Ads ranking platform; providing technical leadership; and collaborating with research and engineering teams. Required qualifications include a relevant degree with 3-6+ years of experience depending on degree level, ability to pass Microsoft Cloud background check, and experience in ML model development and deployment. Preferred qualifications include experience with large-scale recommendation systems, platform architecture influence, publications in top-tier venues, and proficiency in deep learning frameworks such as PyTorch, Hugging Face, and TensorFlow. The role is full-time, on-site in Bengaluru, India.