Principal Software Engineer

CoreAI is at the forefront of Microsoft’s mission to redefine how software is built and experienced. We are responsible for building the foundational platforms, services, programming models, and developer experiences that power the next generation of applications using Generative AI. Our work enables developers and enterprises to harness the full potential of AI to create intelligent, adaptive, and transformative software.     

Microsoft Foundry Experiences team within CoreAI builds SDKs, UI, and agentic experiences that span core AI capabilities including model inferencing, knowledge and memory systems, AI services, model customization, and multi-agent solutions. As a Principal Software Engineer on this team, you will play a critical role in ensuring these capabilities are surfaced through cohesive, scalable, and intuitive experiences that enable developers and enterprises to effectively build, deploy, and operate AI applications. You will anticipate and deeply understand customer and developer needs in complex scenarios, translating them into durable platform capabilities and delightful experiences. 

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.    

In alignment with our Microsoft values, we are committed to cultivating an inclusive work environment for all employees to positively impact our culture every day.    

#CoreAI, #AIPlatform, #FoundryAgents, #AIJobs 

As a Principal Engineer on Microsoft Foundry team, your responsibilities include:    

• Define, architect and develop Foundry agent platform services and developer experiences in TypeScript, Python, and C#, enabling customers to build, deploy, evaluate, and manage intelligent agents at scale on Microsoft Foundry. 

• Champion AI-Native Development by leveraging AI tools across the SDLC, owning AI-generated assets, incorporating Responsible AI practices, and applying engineering health measures to drive continuous improvement. 

• Lead API, SDK, CLI, and UI development that delivers intuitive, consistent, and well-documented experiences for building AI agents and integrating with GenAI models. 

• Own architecture decisions for complex features including agent orchestration, knowledge integration, tool calling, and multi-turn conversations—ensuring scalability and extensibility. 

• Serve as DRI for deployment, monitoring, incident response, and continuous improvement of live site services. 

• Lead by example through code reviews, mentoring, and technical leadership—driving engineering excellence and growing talent across the team.