Senior Security Engineer and Principal Security Engineer (Multiple Positions)

Job ID: 200045403Posted: 2026-09-16Location: United States, Washington, RedmondSalary: USD $119,800 - $234,700 per yearEmployment type: Full-TimeWork site: 0 days / week in-office – remoteRole type: Individual ContributorTravel: Less than 25%Profession: Security EngineeringDiscipline: Penetration TestingCompany: MicrosoftOverviewThe Microsoft Windows Security team is looking for learn-it-all security engineers that will help secure Microsoft Windows products and devices, with focus on offensive security and security engineering & mitigations for Windows.The Windows Security team is responsible for securing the Windows client and server operating systems, used by billions of customers every day and in businesses worldwide. This team performs security design reviews, code reviews, penetration testing, vulnerability research and driving systematic mitigations to security risks on Windows to make sure they meet the highest possible security standards and proactively defend cybersecurity threats. This role is hands-on, technically demanding, and central to strengthening the security posture of OS platforms. In this role, you will uncover novel attack vectors, develop proof-of-concept mitigations, and partner directly with Windows product engineering teams to design durable & scalable defense. The successful candidate will have hands-on experience with native code (C/C++), penetration testing (code audit, writing fuzzers, finding creative ways to break assumptions), a clear understanding of OS security fundamentals, computer science skills, and a passion for keeping Microsoft customers safe. 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.ResponsibilitiesBuild reusable agents and tools to expedite and improve the consistency and quality of security reviewsReview features and code for security defects and architectural risk using agents and automated tools built by you and othersBe the security contact for teams building new innovative products and technologies in the next version of Windows and devices Identify security vulnerabilities in a wide variety of key OS features such as network protocols, security features, and Microsoft devices Leverage a broad and current understanding of security to devise new protections Interact with the external security community and security researchersCollaborate with product teams to improve security, and articulate the business value of security investments QualificationsRequired Qualifications:Master's Degree in Statistics, Mathematics, Computer Science, or related field AND 3+ years experience in security or related fieldOR Bachelor's Degree in Statistics, Mathematics, Computer Science, or related field AND 4+ years experience in security or related fieldOR 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 Statistics, Mathematics, Computer Science, or related field AND 4+ years experience in security or related field OR Bachelor's Degree in Statistics, Mathematics, Computer Science, or related field AND 6+ years experience in security or related fieldOR equivalent experience.2+ years identifying vulnerabilities in operating systems and/or native (C/C++) applications. 5+ years of experience in a software engineering or security-related engineering. Demonstrated experience in security research, especially around vulnerability discovery. Experience exploiting bugs and bypassing security mitigations in operating systems.Familiarity with Microsoft Windows architecture. #W+DJobs #WARPPenetration Testing 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:Penetration Testing IC5 - The typical base pay range for this role across the U.S. is USD $142,800 - $274,800 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 $188,000 - $304,200 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.