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Microsoft Corporation Logo Microsoft Corporation · IT - Software Development

Principal Research Engineer

United States, Redmond 139900.00 - 274800.00 USD / Year · Job Posted February 16, 2026
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Job Description

Join Microsoft’s CoreAI group as a Principal Research Engineer on the AI Data Platform team—the foundation for secure, scalable, reusable datasets that power AI model development across the company. This central platform manages the full lifecycle of Microsoft’s AI training data, accelerating model development with high-quality, compliant, and reusable datasets and services.

Job Responsibility

  • Design and build a data quality evaluation framework for AI training datasets, including scalable metrics, testing methodologies, and automated reporting
  • Define and operationalize quality signals aligned to model outcomes (e.g., coverage, diversity, noise/duplication, labeling consistency, safety/toxicity, privacy/compliance risk indicators)
  • Collaborate with cross-functional stakeholders to run experiments, establish best practices, and deliver reusable tools that scale across multiple model and product teams
  • Develop task- and model-aware evaluation approaches that connect dataset properties to training performance, reliability, and safety
  • Create automated dataset validation gates and monitoring to support continuous dataset iteration (e.g., regression detection across dataset versions)
  • Design and implement synthetic data generation pipelines (LLM-driven and programmatic approaches) to improve long-tail representation, fill coverage gaps, and accelerate iteration cycles
  • Build guardrails for synthetic data: filtering, scoring, calibration, provenance tracking, and bias/safety checks to ensure quality and compliance
  • Partner with engineering to integrate evaluation and generation into the platform’s end-to-end data lifecycle

Requirements

  • Bachelor's Degree in Computer Science, Electrical or Computer Engineering, or related field AND 6+ years related experience (e.g., statistics, predictive analytics, research)
  • OR Master's Degree in Computer Science, Electrical or Computer Engineering, or related field AND 4+ years related experience
  • OR Doctorate in Computer Science, Electrical or Computer Engineering, or related field AND 3+ years related experience
  • OR equivalent experience
  • Ability to meet Microsoft, customer and/or government security screening requirements
  • Microsoft Cloud Background Check upon hire/transfer and every two years thereafter

Nice to have

  • Doctorate in Computer Science, Electrical or Computer Engineering, or related field AND 3+ year(s) related experience
  • 5+ years of coding experience in Python and experience with ML frameworks such as PyTorch and Triton
  • 3+ years experience of large-scale model training for LLMs, SLMs, and agentic models
  • 3+ years of proven ability to design and scale training infrastructure and pipelines in production environments
  • Experience with agent training frameworks
  • Demonstrated experience developing synthetic data generation pipelines to enable SFT and RL training of agentic models
  • Hands-on experience with large-scale distributed training and/or serving with demonstrated ability to dive deep into complex systems, troubleshoot unconventional issues, and craft innovative solutions under real-world constraints
  • Extensive experience with large-scale training, model inference, reinforcement learning, and reasoning models
  • Demonstrated ability to work in cross-functional teams and collaborate effectively with researchers, product managers, and other engineers to deliver complex ML solutions
  • Startup-style mindset: agile, solution-oriented, and self-driven
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