Principal Software Engineer

Principal Software Engineer - Security

Microsoft Corporation

Location:
United States , Redmond

Category:
IT - Software Development

Contract Type:
Not provided

Salary:

139900.00 - 274800.00 USD / Year

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Job Description:

We are seeking a hands-on Principal Software Engineer (Security) with deep expertise in artificial intelligence security to take the lead in securing cutting-edge initiatives in Microsoft Edge. This Redmond-based role focuses on understanding existing and emerging threats, as well as cutting edge defenses, all within the context of a modern web browser. The ideal candidate has a solid background in AI (understanding how large language models work, prompt engineering, grounding techniques, when fine-tuning models is needed). While browser security domain knowledge is desirable, experience and expertise of AI integrations is paramount. This engineer will research new AI-driven vulnerabilities and implement practical mitigations to keep our users safe. The role is highly collaborative and requires excellent communication skills to work with multiple internal groups and external industry partners on securing AI features for modern AI browsers.

Job Responsibility:

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.

Requirements:

Bachelor'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 Python
OR equivalent experience.
Ability to meet Microsoft, customer and/or government security screening requirements are required for this role.
This position will be required to pass the Microsoft Cloud background check upon hire/transfer and every two years thereafter.

Nice to have:

Master'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 Bachelor's Degree in Computer Science or related technical field AND 12+ years technical engineering experience with coding in languages including, but not limited to, C, C++, C#, Java, JavaScript, or Python
OR equivalent experience.
3+ years of experience in AI/ML security
OR equivalent recent security expertise.
Demonstrated ability to apply AI knowledge in practice including prompt engineering
Or grounding
Or model fine tuning
Demonstrated ability to both break systems and discover novel security flaws as well as building safeguards to mitigate them.
Experience with Modern browsers, especially chromium-based browsers.
Experience representing a team in multi-stakeholder environments.

Additional Information:

Job Posted:
January 29, 2026

Employment Type:

Fulltime

Work Type:

On-site work

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