Sr. Software Engineer - CTJ - Secret

Step into the future of connectivity with the Microsoft 365 Substrate First Mile Networking team, where bold innovation meets massive scale. We shape the networking infrastructure that fuels Substrate and COSMIC—critical platforms behind Microsoft’s most impactful productivity experiences like Copilot, Outlook, Teams, and SharePoint. We tackle some of the most complex distributed systems challenges in the industry, driving performance, reliability, and intelligence across global networks. With millions of users depending on our solutions daily, our contributions resonate across the entire Microsoft ecosystem.

As a Sr. Software Engineer in the Microsoft 365 Substrate First Mile Networking team, you will design and implement scalable networking solutions for the Microsoft 365 Substrate and the COSMIC (container-based) platforms. Our product offerings extend to sovereign cloud environments, and your clearance will allow you to work in specialized environments focused on the unique needs of a critical customer base. You will design and optimize first-mile connectivity systems to ensure low-latency, high-reliability access to productivity services. Additionally, you will analyze production service telemetry to identify and implement continuous improvements. This opportunity will allow you to work on foundational infrastructure that powers Microsoft’s most critical services. It will provide an opportunity to solve real-world problems at massive scale with global impact, on a team that values innovation, autonomy, and technical depth.

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

- Collaborates with appropriate stakeholders to determine user requirements for a scenario.

- Drives identification of dependencies and the development of design documents for a product, application, service, or platform.

- Creates, implements, optimizes, debugs, refactors, and reuses code to establish and improve performance and maintainability, effectiveness, and return on investment (ROI).

- Leverages subject-matter expertise of product features and partners with appropriate stakeholders (e.g., project managers) to drive a workgroup's project plans, release plans, and work items.

- Acts as a Designated Responsible Individual (DRI) and guides other engineers by developing and following the playbook, working on call to monitor system/product/service for degradation, downtime, or interruptions, alerting stakeholders about status and initiates actions to restore system/product/service for simple and complex problems when appropriate.