We operate at the forefront of operating systems, networking, security, and performance engineering, building the transport technologies that underpin Microsoft's cloud and platform ecosystem. Our work powers critical services and workloads across Windows, Azure, and next-generation cloud infrastructure, enabling secure, reliable, and high-performance communication at global scale.
In Core OS, we are responsible for the Operating Systems that power Azure, Microsoft's Linux OS, the platforms for Windows Client and Xbox, and our Windows Server ecosystem – through all of these, we support every one of our cloud businesses and billions of customers around the world. In this era of ubiquitous computing, systems software excellence has never been more important for Microsoft. High quality, high-efficiency operating systems and platform components underpin everything we do as a company, from making our systems more reliable for our customers, to increasing our competitiveness by reducing COGS, to delivering new features and capabilities to delight customers – that’s all us!
The Datapath & Transports team builds the networking technologies that carries traffic across Windows, Azure, Xbox, and Microsoft's cloud services. When you improve a congestion control algorithm or shave microseconds off the datapath here, it ships to billions of devices and some of the largest services on the planet.
As a Software Engineer II, you will design and build core transport technologies alongside experts across Windows, Azure, SQL, Security, and Developer Platform. You will work on QUIC and HTTP/3, TLS, congestion control, network acceleration, and the diagnostics and security that make them trustworthy - solving hard problems in performance, reliability, and protocol design. It is a role that deepens your expertise in networking, systems architecture, and distributed systems, with real opportunities for impact across the industry and in open source.
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.
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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.
Every company has a mission. What's ours? To empower every person and every organization to achieve more. We believe technology can and should be a force for good and that meaningful innovation contributes to a brighter world in the future and today. Our culture doesn’t just encourage curiosity; it embraces it. Each day we make progress together by showing up as our authentic selves. We show up with a learn-it-all mentality. We show up cheering on others, knowing their success doesn't diminish our own. We show up every day open to learning our own biases, changing our behavior, and inviting in differences. Because impact matters.
Microsoft operates in 190 countries and is made up of approximately 228,000 passionate employees worldwide.
