Senior Software Engineer- M365

Job ID: 200055933Posted: 2026-09-21Location: United States, Washington, RedmondSalary: USD $119,800 - $234,700 per yearEmployment type: Full-TimeWork site: 3 days / week in-officeRole type: Individual ContributorTravel: Less than 25%Profession: Software EngineeringDiscipline: Software EngineeringCompany: MicrosoftOverviewSubstrate is the data and intelligence platform that enables partner teams at Microsoft to build, deploy, and maintain compliant productivity apps and services with reduced effort and faster time to market. Substrate is one of the key pillars of Microsoft 365 cloud business offerings, used by millions of people across the world, hundreds of thousands of commercial organizations and government agencies. Core Authentication team is one of the fundamental teams in Substrate responsible for building of authentication and authorization stacks that provides user access into Substrate and inter-service communication within the Substrate. The team mission is to provide secure, reliable and resilient authentication and authorization layers for the Substrate and on-premises configurations, including our partners, and to serve as the gatekeeper for the core Microsoft 365 resources. We are looking for engineers who are passionate about security, technical challenges, debugging and above all – customer success and satisfaction. Familiarity with the modern authentication methodologies and security fundamentals is a big plus. Not only are you going to become an expert in the security field but will also learn and appreciate first-hand how to build highly available distributed services of planetary scale working for thousands of businesses and millions of consumers around the world.   We are looking for a Senior Software Engineer who enjoys solving massive scale challenges and embraces the cultural values of inclusion and belonging. Your work will be high impact with initial delivery in less than 6 months. Great core development skills are necessary to have, and we strongly prefer candidates who have expertise in the areas of building and evolving large-scale services.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.ResponsibilitiesEnd-to-end ownership of a feature area related to authentication/authorization, responsible for all aspects of designing, developing and deploying the solution.Close interactions with cross-functional discipline contributors (product managers, architects, security engineers, support engineers).Participation in the on-call rotation. 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#, Java, JavaScript, or Python OR 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.U.S. Citizenship and an Active Secret Clearance required. Experience working in regulated or government cloud environments preferred.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#, 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#, Java, JavaScript, or Python OR equivalent experience. Design, implementation, debugging and testing of complex distributed services. Customer/government security screening requirements, including Microsoft Cloud Background check.Basic knowledge of Distributed Systems and Cloud Technologies.Basic knowledge of authentication protocols.Experience driving a complex multi-year infrastructure project 3+ years of experience building commercial grade software, with much of that experience in a large scale, high availability service. Effective communication skills and experience working across disciplines and functions. #M365Software 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: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.