Overview

3P Copilot Extensibility team builds the platform that powers Microsoft 365 Copilot agents. We enable developers and enterprises to build scalable, extensible, secure AI powered agents using the Model Context Protocol (MCP), OpenAI SDKs, and the underlying substrate for knowledge, orchestration, discovery, engagement, and actions.

As a Senior Software Engineer, you will drive key platform components, lead complex design areas, and deepen our architectural foundation to support a fast evolving AI ecosystem.

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:

Full Stack & Platform Engineering:

• Design and build robust services powering agent runtime, agent capabilities, and extensibility surfaces.
• Contribute to high scale backend systems that support agent knowledge integration, grounding, and lifecycle management.

Technical Leadership

• Lead design and implementation of features that expand the agent and MCP-based platform.
• Partner with cross company teams across Microsoft 365, M365 Substrate, and Copilot to align architectural patterns and platform coherence.

Engineering Excellence, Scale, and Reliability

• Elevate code quality, testing rigor, resiliency, and operational readiness.
• Instrument services with telemetry, diagnostics, and observability to guide data driven evolution of the platform.
• Improve endtoend performance of agent experiences across web, desktop, and mobile.

Innovation & Customer Impact:

• Identify gaps and opportunities in the agent developer ecosystem; influence roadmap for SDKs, toolchains, and runtime improvements.
• Mentor junior engineers, drive code reviews, and foster a culture of engineering excellence.

Qualifications:

Required Qualifications:

• Bachelor's Degree in Computer Science or related technical field AND 7+ years technical engineering experience with coding in languages including, but not limited to, C, C++, C#, Java, JavaScript, or Python.OR equivalent experience.
• Experience designing, building, and operating distributed systems or cloudscale services.
• Depth in APIs, microservices, cloud security, and service reliability engineering.

Preferred Qualifications:

• Experience with Model Context Protocol (MCP), agent frameworks, or AI powered application development.
• Knowledge of Azure services, CI/CD pipelines, or microservice hosting environments.
• Demonstrated ability to influence architecture, lead complex multiteam projects, and mentor engineers.
• Exposure to AI productivity tools.

#M365CORE

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.