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Senior Security Engineer and Principal Security Engineer

United States, Redmond 119800.00 - 234700.00 USD / Year · Job Posted February 13, 2026
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Job Description

The Microsoft Windows Security team is looking for a 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.

Job Responsibility

  • Participate in security reviews to identify and mitigate risk in Microsoft products, including design reviews, code reviews, and fuzzing
  • Be 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 researchers
  • Collaborate with product teams to improve security, and articulate the business value of security investments

Requirements

  • Master's Degree in Statistics, Mathematics, Computer Science, or related field AND 3+ years experience in security or related field OR Bachelor's Degree in Statistics, Mathematics, Computer Science, or related field AND 4+ years experience in security or related field OR equivalent experience
  • Ability to meet Microsoft, customer and/or government security screening requirements
  • Microsoft Cloud Background Check upon hire/transfer and every two years thereafter
  • 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
  • Demanstrated experience in security research, especially around vulnerability discovery
  • Experience exploiting bugs and bypassing security mitigations in operating systems
  • Familiarity with Microsoft Windows architecture

Nice to have

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 field OR equivalent experience

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