New 
Senior Software Engineer - Copilot Extensibility
 Microsoft | |
 United States, Washington, Redmond | |
 Oct 26, 2025 | |
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OverviewAs a Senior Software Engineer - Copilot Extensibility on the Copilot Extensibility Platform, you will play a key role in designing and building systems that empower developers and partners to extend Microsoft Copilot. You'll write C# code to develop scalable services that form the backbone of our extensibility platform, contributing both to the core infrastructure and to co-development efforts with partner teams across Microsoft.This role places you at the center of Microsoft's AI innovation. You'll work closely with teams across the company, gaining a deep, end-to-end understanding of how Copilot integrates into Microsoft 365 and other products. The work is fast-paced, highly collaborative, and strategically important, offering the opportunity to influence the direction of a platform that is transforming how people work. Success in this role requires reliable technical skills, a collaborative mindset, and the ability to thrive in a dynamic, competitive environment.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.
ResponsibilitiesWorks with appropriate stakeholders to determine user requirements for a set of features.Contributes to the identification of dependencies, and the development of design documents for a product area with little oversight.Creates and implements code for a product, service, or feature, reusing code as applicable.Contributes to efforts to break down larger work items into smaller work items and provides estimation.Acts as a Designated Responsible Individual (DRI) working on-call to monitor system/product feature/service for degradation, downtime, or interruptions and gains approval to restore system/product/service for simple problems.Remains current in skills by investing time and effort into staying abreast of current developments that will improve the availability, reliability, efficiency, observability, and performance of products while also driving consistency in monitoring and operations at scale. | |