Senior Machine Learning Engineer - CoreAI
 Microsoft | |
 United States, Washington, Redmond | |
 Jul 13, 2025 | |
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OverviewThe Microsoft CoreAI Post-Training team is dedicated to advancing post-training methods for both OpenAI and open-source models. Their work encompasses continual pre-training, large-scale deep reinforcement learning running on extensive GPU resources, and significant efforts to curate and synthesize training data. In addition, the team employs various fine-tuning approaches to support both research and product development. The team also develops advanced AI technologies that integrate language and multi-modality for a range of Microsoft products. The team is particularly active in developing code-specific models, including those used in Github Copilot and Visual Studio Code, such as code completion model and the software engineering (SWE) agent models. The team has also produced publications as by-products, including work such as LoRA, DeBerTa, Oscar, Rho-1, Florence, and the open-source Phi models. We are looking for a Senior Machine Learning Engineer - CoreAI with significant experience in large-scale model training, data curation, and hands-on coding, ideally from leading research labs. You will develop LLMs, SLMs, multimodal, and coding models using both proprietary and open-source frameworks. Key responsibilities include improving model quality and training efficiency through advanced techniques and data strategies, and managing the full pipeline from data ingestion, evaluation, to inference. Our team values startup-style efficiency and practical problem-solving. We are seeking a curious, adaptable problem-solver who thrives on continuous learning, embraces changing priorities, and is motivated by creating meaningful impact. Candidates must be self-driven, able to write high-quality code and debug complex systems, document their work clearly, and demonstrate solid experience in shipping ML systems. The ability to quickly translate ideas into working code for rapid experimentation would be a plus. You may include information about any individual who can serve as your referral in your application. Microsoft's mission is to empower every person and every organization on the planet to achieve more. As employees we come together with a growth mindset, innovate to empower others, and collaborate to realize our shared goals. Each day we build on our values of respect, integrity, and accountability to create a culture of inclusion where everyone can thrive at work and beyond. In alignment with our Microsoft values, we are committed to cultivating an inclusive work environment for all employees to positivelyimpactour culture every day.
ResponsibilitiesCore Qualifications & Responsibilities Implement large-scale model training, especially with LLMs, SLMs, multimodal, or code-specific models. Develop robust evaluation frameworks to assess model performance, conduct systematic benchmarking, and address identified weaknesses while ensuring compliance with customer standards. Write efficient, production-quality code and debug complex distributed systems. Build and maintain internal tools to streamline training and evaluation workflows and automate repetitive tasks within secure development environments. Research & Innovation Contribute to or build on existing innovations like technical report of the well-known models. Help develop models powering tools like GitHub Copilot, Cursor, and VS Code suggestions. Other: Embody our Culture and Values | |