OverviewYou’ll join the Substrate Directory Platform team, where we are modernizing how tenant-wide administrative data is stored, served, and operated at global scale. Working in the heart of M365, you’ll replace legacy directory paths with a durable, consistent, and resilient platform—one that becomes the long‑term source of truth for administrative operations across the cloud.As a Senior Software Engineer on the Substrate Directory Platform team, you will design, build, and operate distributed services, data models, and APIs that power tenant-wide administrative scenarios across Microsoft 365. You’ll take ownership of key system components, drive design and execution across complex problem spaces, and help evolve both the architecture and the operational maturity of the platform.This opportunity will allow you to accelerate your growth shipping cloud‑scale services, develop deep expertise in distributed systems and storage, and apply emerging AI techniques responsibly to real engineering challenges such as anomaly detection, incident summarization, and developer workflow automation. Hybrid work is supported per team and site guidelines.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.ResponsibilitiesCollaborate with appropriate stakeholders to define user requirements and translate ambiguous problem spaces into clear, actionable technical solutions.Drive the identification of dependencies and lead the development of design documents for product areas, services, or platforms with minimal oversight.Create, implement, optimize, debug, refactor, and reuse code to improve system performance, maintainability, reliability, and overall return on investment (ROI).Leverage deep understanding of product features to partner with program managers and other stakeholders in driving project plans, release strategies, and well-scoped work items.Act as a Designated Responsible Individual (DRI) for critical components; guide other engineers by establishing and following operational playbooks, participating in on‑call rotations, and leading mitigation and recovery for both simple and complex service issues.Proactively seek new knowledge and adopt modern patterns, tools, and AI‑assisted techniques that improve availability, durability, efficiency, observability, and operational consistency at scale.QualificationsRequired 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#, Rust, Java, JavaScript, or PythonOR equivalent experience.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 security screenings:Microsoft Cloud Background Check: This position will be required to pass the Microsoft Cloud background check upon hire/transfer and every two years thereafter.Preferred Qualifications:Master's Degree in Computer Science or related technical field AND 6+ years technical engineering experience with coding in languages including, but not limited to, C, C++, C#, Rust, Java, JavaScript, or PythonOR Bachelor's Degree in Computer Science or related technical field AND 8+ years technical engineering experience with coding in languages including, but not limited to, C, C++, C#, Rust, Java, JavaScript, or PythonOR equivalent experience. Experience designing and operating distributed systems with clear guarantees around consistency, durability, availability, and well‑defined SLOs.Hands‑on experience with Azure, SQL/NoSQL storage, caching and messaging systems, CI/CD pipelines, and observability tooling (logs, metrics, traces; Kusto preferred).Demonstrated curiosity for emerging AI technologies and applying them pragmatically to engineering workflows such as diagnostics, intelligent runbooks, incident analysis, and developer productivity—aligned with Microsoft Responsible AI principles.#distributedsystems #storagelayer #dataplane #highscale #azuresql Software Engineering IC4 - The typical base pay range for this role across the U.S. is USD $119,800 - $234,700 per year. There is a different range applicable to specific work locations, within the San Francisco Bay area and New York City metropolitan area, and the base pay range for this role in those locations is USD $160,200 - $261,000 per year. Certain roles may be eligible for benefits and other compensation. Find additional benefits and pay information here:https://careers.microsoft.com/us/en/us-corporate-payThis 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.