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Principal Applied Scientist

Microsoft· Applied Sciences
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Redmond, WA, Boston, MA$142.8k - $274.8kFull-timePosted 1mo ago

About the role

The Microsoft 365 Copilot Reasoning Science team is hiring a Principal Applied Scientist to build reliable, long-horizon agentic capabilities for M365 Copilot Chat, advancing frontier-model harness engineering and evaluation for multi-step task planning and execution at scale.

Responsibilities

  • Defining and managing experiments from inception to shipment, creating the requisite metrics, ML pipelines, algorithms. Owning problems end-to-end and filling knowledge gaps as needed.
  • Defining rigorous evaluation methodologies, offline benchmarks, online experimentation frameworks and data-driven approaches for measuring model and product performance.
  • Influencing senior leadership and partner teams through quality written and oral summaries of work in progress and experimentation results.
  • Building tools to accelerate workflows, when off-the-shelf solutions aren’t sufficient.
  • Contributing to strategic planning and long-term technical roadmaps, incorporating latest research to meet business goals.
  • Contributing to the growth and development of the team’s engineers and applied scientists; identifying new research talent and collaborating with academia to develop recruiting pipelines.
  • Supporting and developing a thriving applied science culture within CASQ to encourage experimentation, scientific process, and innovation.

Qualifications

  • Bachelor's Degree in Statistics, Econometrics, 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 Statistics, Econometrics, Computer Science, Electrical or Computer Engineering, or related field AND 4+ years related experience OR Doctorate in Statistics, Econometrics, Computer Science, Electrical or Computer Engineering, or related field AND 3+ years related experience OR equivalent experience.
  • Microsoft Cloud Background Check required at hire and every two years thereafter.

Skills

Required:Experiment design and managementEvaluation methodologiesCommunication with stakeholders
Nice to have:Tooling for workflowsStrategic planning and roadmappingMentoring and team development
Last updated Oct 23, 2026. Interested? Apply on the company site.

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