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Principal Security Engineer

Microsoft United States

United States

Today

$143k - $304k/yr Full time Active Directory Agent Agentic Ai Security

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Job Description

Principal-level operator role focused on planning and executing end-to-end adversary emulation and leading agentic, AI-driven red team operations.

Own end-to-end CyberShield red team engagements covering initial access, privilege escalation, lateral movement and pivoting, persistence, objective completion, and reporting
Validate detection, investigation, and response using real-world adversary tactics, techniques, and procedures across Microsoft’s own environment and selected external customer environments
Build custom tooling and tradecraft (including implants) to evade modern defenses and emulate advanced adversary capabilities
Lead agentic red team operations by designing and directing AI agents that autonomously handle reconnaissance, vulnerability discovery, exploitation, and post-exploitation
Define guardrails, oversight, and human-in-the-loop checkpoints for autonomous execution
Drive the shift from human-led execution to continuous, software-driven, agentic analysis
Discover and exploit vulnerabilities end-to-end across application, cloud, identity, network, hardware, and operational security layers
Chain findings into realistic attack paths that demonstrate business impact
Serve as forward-deployed technical lead with customers by briefing CISOs and security leaders, translating findings into actionable narratives, and delivering lightweight defensive engineering guidance
Prototype and productionize tools, agents, and techniques that scale offensive emulation and vulnerability discovery
Feed requirements back to the offensive AI platform engineering team based on what works in real environments
Collaborate with Blue Teams, GHOST (adversary hunting and response), MSTIC (threat intelligence), and internal service teams to convert findings into product hardening and improved defender readiness
Set operational standards and playbooks for CyberShield engagements
Mentor senior operators and virtual-team specialists drawn from across MRT
Advocate for security change across Microsoft and customers through partnerships and clear communication of risk impact
Embody the company Culture and Values

Requirements

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
Ability to meet Microsoft, customer, and/or government security screening requirements, including but not limited to Microsoft Cloud Background Check (required to pass upon hire/transfer and every two years thereafter)
Possible additional customer- or government-directed vetting

Additional or Preferred Qualifications

Master’s Degree in Statistics, Mathematics, Computer Science, or related field AND 8+ years experience in security or related field
OR Bachelor’s Degree in Statistics, Mathematics, Computer Science, or related field AND 12+ years experience in security or related field
OR equivalent experience
6+ years planning and leading red team or adversary emulation operations against enterprise or cloud environments
Hands-on experience building, directing, or operating AI-driven or agentic offensive security tooling in real operations
Active U.S. Government TS//SCI clearance with full-scope polygraph is a strong plus
8+ years identifying and exploiting vulnerabilities across cloud (Azure, AWS, GCP), identity (Entra ID / Active Directory), Windows and Linux endpoints, network, and hardware
Experience designing multi-agent or autonomous systems using large language models, including orchestration frameworks, tool use, agent evaluation, and safety guardrails applied to offensive security
6+ years coding or scripting with Python, C#, C++, Go, PowerShell, .NET, Rust, or comparable languages, including building and maintaining offensive tooling
Customer-facing or consulting experience delivering red team results to executive audiences, with ability to connect technical detail to business impact
Blue team, detection engineering, or incident response experience
Familiarity with MITRE ATT&CK, threat-informed defense, and regulated red team frameworks (TIBER-EU, CBEST, DORA)
Recognized community contributions such as research, open-source tooling, conference talks, or CVEs

Technologies

Python
C#
C++
Go
PowerShell
.NET
Rust
Azure
AWS
GCP
Entra ID
Active Directory
Windows
Linux
MITRE ATT&CK
TIBER-EU
CBEST
DORA

Location: United States (onsite)

Salary range: USD 142,800 - 304,200 per year

Experience minimum: 4 years

Education: Master’s Degree in Statistics, Mathematics, Computer Science, or related field

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