Senior Software Engineer - Compiler

Any Developer.  Any App.  Any Platform.

Within the Developer Division, the Languages, Runtimes, and Compilers Group at Microsoft is responsible for best-in-class support for C++, Java, .NET (C#, Visual Basic, and F#), Python, Rust, and Go.  Developer Division in CoreAI, believes software development is rapidly evolving in the age of Artificial Intelligence. We are building the future of platforms and tools for this new era—and we are looking for developers who are not only early adopters of AI-powered development tools, but who are also actively exploring how large language models (LLMs) can enhance their effectiveness and impact.

Be a part of a team that values collaboration and the idea of working better together. Come to help us define the language, optimize the compiler and runtime, and build tooling that empowers developers worldwide to build great software.

The .NET Core Runtime’s Codegen/JIT team is looking for a Senior Software Engineer - Compiler who shares a passion for system programming, compiler development, and deeply understanding developer expectations. As a member of the .NET Codegen team, you will work on optimizing the Just-In-Time (JIT) compiler that powers millions of .NET applications, with a focus on performance, diagnostics, and support for evolving hardware platforms.

Microsoft Culture
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

• Lead the design and optimization of the .NET JIT compiler, including code generation, register allocation, and performance tuning across multiple architectures and hardware platforms.
• Proactively identify and deliver innovative features that advance compiler technology and developer tooling for new architectures, platforms, and developer scenarios.
• Collaborate with peer teams, customers, and hardware partners to ensure compiler solutions address business needs effectively.
• Own complex technical problems in foundational areas that will affect Languages, Runtimes, and Compilers to target new platforms or provide new experiences.
• Demonstrate strong written communication skills by authoring clear, comprehensive technical specifications, design documents, and architecture proposals for compiler features and system enhancements.
• Integrate AI-assisted tools (e.g., GitHub Copilot) to improve productivity, code quality, and developer experience, including prototyping AI-driven improvements to tooling, diagnostics, or compiler optimizations with large language models as needed.
• Mentor and guide other engineers, fostering technical growth and best practices.
• Foster open-source discussions, code reviews, and community forums to gather feedback and share expertise.
• Design and build the .NET compiler directly improving developer satisfaction by delivering high quality and performant experiences.
• Design, implement, debug, and deliver experiences primarily in C++ and C.
• Wants to be part of a motivated and collaborative engineering team.
• MS Culture & Values: Embody our Culture and Values.

Qualifications

Required Qualifications:

• Bachelor's Degree in Computer Science or related technical field AND 4+ years technical engineering experience with coding in languages including, but not limited to, C++, C, C#, OR/ and Java
  • OR equivalent experience.
• 4+ years of industry experience developing compiler technologies
• 6+ months of experience using AI-assisted development tools (e.g., GitHub Copilot, or similar) to enhance productivity and code quality

Other Requirements:

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 secu