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Job Details
Posted date: Sep 09, 2026
There have been 314 jobs posted with the title of Principal Applied Scientist all time at Microsoft.There have been 314 Principal Applied Scientist jobs posted in the last month.
Category: Applied Sciences
Location: Redmond, WA
Estimated salary: $223,500
Range: $142,800 - $304,200
Employment type: Full-Time
Work location type: 3 days / week in-office
Role: Individual Contributor
Description
OverviewThe Microsoft 365 Copilot Reasoning Science team is looking for a Principal Applied Scientist to help shape the future of enterprise productivity by building reliable, long-horizon agentic capabilities for M365 Copilot Chat. In this role, you’ll advance the state of the art in frontier-model harness engineering and evaluation, tackling the challenges required for AI agents to reliably plan, reason, and execute complex, multi-step tasks on behalf of millions of users.
The ideal candidate is a self-starter who thrives in a fast-paced, high-visibility environment, and is passionate about being data-driven, iteration speed, scale, and engineering culture. You will be presented with opportunities to have great impact, work with frontier models, and collaborate closely with teams across the company, including Microsoft Research, Azure, and MAI. 
The team is part of CACore (Copilot and Agents Core Platform), an organization that brings together talent in the areas of LLMs (Large Language Models), recommender systems, machine learning, information retrieval, agentic engineering, and responsible AI. This role is flexible in that you will be able to partner with your manager to define the way that you’d like to work, whether in the office or from home.
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.
Responsibilities
Defining and managing experiments from inception to shipment, creating the requisite metrics, ML pipelines, algorithms. Owning problems end-to-end and being willing to pick up whatever knowledge you’re missing to get the job done.
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 your own (and your teammates’) workflows, but only when off-the-shelf solutions won’t do.
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 to join Microsoft and collaborating with the academic community to develop the recruiting pipeline.
Supporting and developing a thriving applied science culture within CASQ to encourage experimentation, scientific process, and innovation.
Qualifications
Required 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 (e.g., statistics, predictive analytics, research)OR Doctorate in Statistics, Econometrics, Computer Science, Electrical or Computer Engineering, or related field AND 3+ years related experience (e.g., statistics, predictive analytics, research)OR equivalent experience. Microsoft Cloud Background Check: This position will be required to pass the Microsoft Cloud background check upon hire/transfer and every two years thereafter.
Preferred Qualifications:
Proficiency in agentic engineering.Master's Degree in Statistics, Econometrics, Computer Science, Electrical or Computer Engineering, or related field AND 9+ years related experience (e.g., statistics, predictive analytics, research) OR Doctorate in Statistics, Econometrics, Computer Science, Electrical or Computer Engineering, or related field AND 6+ years related experience (e.g., statistics, predictive analytics, research) OR equivalent experience.  5+ years experience creating publications (e.g., patents, libraries, peer-reviewed academic papers). 5+ year(s) building and maintaining production machine learning systems at internet scale. 3+ year(s) experience in working with multidisciplinary, geo-distributed team. Demonstrated experience owning end-to-end machine learning and software projects, including gathering requirements and feedback, collaborating with cross-functional stakeholders, producing technical designs, shipping to production, and iterating on systems post-launch. Ability to thrive in dynamic environments, especially where priorities may shift and project definitions evolve. Advanced expertise in agentic engineering.
Applied Sciences IC5 - The typical base pay range for this role across the U.S. is USD $142,800 - $274,800 per year. There is a different range applicable to specific work locations, within the San Francisco Bay area and New York City metropolitan area, and the base pay range for this role in those locations is USD $188,000 - $304,200 per year.
Certain roles may be eligible for benefits and other compensation. Find additional benefits and pay information here:
https://careers.microsoft.com/us/en/us-corporate-pay
This position will be open for a minimum of 5 days, with applications accepted on an ongoing basis until the position is filled.
Microsoft is an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to age, ancestry, citizenship, color, family or medical care leave, gender identity or expression, genetic information, immigration status, marital status, medical condition, national origin, physical or mental disability, political affiliation, protected veteran or military status, race, ethnicity, religion, sex (including pregnancy), sexual orientation, or any other characteristic protected by applicable local laws, regulations and ordinances. If you need assistance with religious accommodations and/or a reasonable accommodation due to a disability during the application process, read more about requesting accommodations.