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Principal Software Engineer - M365 Copilot App

Microsoft

$139,900 - $304,200
Oct 23, 2025
Mountain View, CA, US
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M365 Copilot App (M3CA) is at the forefront of transforming productivity with AI, and this role is responsible for engineering this fast-growing, multi-platform product that enables users to experience Copilot's power.

Requirements

  • coding in languages including, but not limited to, C, C++, C-Sharp, Java, JavaScript, or Python
  • 4+ years experience developing, deploying, and maintaining one or more large scale Windows, Mac, or Web applications.
  • 4+ years experience designing, implementing, and debugging application and frontend code.
  • coding in languages including, but not limited to, C, C++, C-Sharp, Java, JavaScript, or Python
  • coding in languages including, but not limited to, C, C++, C-Sharp, Java, JavaScript, or Python

Responsibilities

  • Designing, building and running the Copilot application across Windows, Mac, and Web platforms.
  • Lead architectural decisions and contribute hands-on code to build applications, balancing innovation with platform stability.
  • Write secure, reliable, scalable code as well as test automation and telemetry to measure its behavior in production.
  • Design, prototype, implement, and ship features.
  • Define reusable architectural patterns and techniques that enable consistent and intelligent user experiences at scale.
  • Provide engineering leadership to the team taking on technical issues inherent in building and delivering a consumer-grade application that powers cross-platform AI experiences.
  • Monitor the product for degradation, downtime, or interruptions.

Other

  • Partners with appropriate stakeholders to determine user requirements across different scenarios.
  • Assists others to produce extensible and maintainable code used across products.
  • Leverages subject-matter knowledge of cross-product features with appropriate stakeholders (e.g., project managers) to drive multiple group's project plans, release plans, and work items.
  • Guides and mentors engineers across the team, working on-call to monitor the product for degradation, downtime, or interruptions.
  • Ability to meet Microsoft, customer and/or government security screening requirements are required for this role. These requirements include but are not limited to the following specialized security screenings:* *Microsoft Cloud Background Check