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Principal Software Engineer - Security

Microsoft

$139,900 - $304,200
Dec 5, 2025
Redmond, WA, US
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Microsoft is seeking a Principal Software Engineer (Security) to secure cutting-edge initiatives in Microsoft Edge, focusing on understanding existing and emerging threats, as well as cutting-edge defenses, within the context of a modern web browser, and to elevate the security posture of Edge’s AI capabilities.

Requirements

  • Coding experience in languages including, but not limited to, C, C++, C-Sharp, Java, JavaScript, or Python
  • Experience with AI/ML security
  • Demonstrated ability to apply AI knowledge in practice including prompt engineering, grounding, or model fine tuning
  • Experience with Modern browsers, especially chromium-based browsers
  • Experience representing a team in multi-stakeholder environments
  • Deep subject-matter expertise of cross-product features
  • Knowledge of large language models, prompt engineering, grounding techniques, and model fine-tuning

Responsibilities

  • Partners with appropriate stakeholders to determine user requirements for one or more complex safety scenarios, including demonstration of security attacks, both practical contemporary attacks or future attacks.
  • Provides technical leadership for the identification of dependencies and the development of design documents for Microsoft Edge and underlying AI platforms.
  • Leads by example and mentors others to produce extensible and maintainable code used across the company.
  • Leverages deep subject-matter expertise of cross-product features with appropriate stakeholders to lead multiple product's project plans, release plans, and work items.
  • Holds accountability as a Designated Responsible Individual (DRI), mentoring engineers across products/solutions, monitoring system/product/service for novel security vulnerabilities.
  • Proactively seeks new knowledge and adapts to new trends, technical solutions, and patterns that will improve the security baseline, efficiency, observability, and performance of products while also driving consistency in monitoring and operations at scale and shares knowledge with other engineers.
  • Research new AI-driven vulnerabilities and implement practical mitigations to keep users safe.

Other

  • Bachelor's Degree in Computer Science or related technical field AND 6+ years technical engineering experience
  • Ability to meet Microsoft, customer and/or government security screening requirements
  • Ability to work from the office at least four days per week, if living within a 50-mile commute of a designated Microsoft office in the U.S. or 25-mile commute of a non-U.S., country-specific location
  • Excellent communication skills to work with multiple internal groups and external industry partners
  • Growth mindset, innovate to empower others, and collaborate to realize shared goals