Senior Detection Engineer, EDR – Defensive Agent

atHorizon3.aiRemoteUS flagUnited StatesFull-timeEngineerSenior$195k – $230k/year

Posted Sep 19

This is a fully remote position, open to applicants in United States.

📋 Description

• Collaborate with Product to transform EDR effectiveness and tuning objectives into actionable, buildable requirements.

• Convert blue team workflows and challenges into prioritized product outcomes.

• Challenge features or agent behaviors that would not withstand scrutiny in a real Security Operations Center (SOC).

• Establish acceptance criteria for detection, effectiveness, and tuning features.

• Verify releases against acceptance criteria prior to customer access.

• Act as the domain reference for Engineering and AI research.

• Provide design evaluations, technique advice, and vendor behavior recommendations.

• Maintain up-to-date knowledge of major EDR and endpoint platforms at the console, policy, telemetry, and API levels.

• Stay informed about detection logic, prevention policies, exclusions, and tuning across various products.

• Define vendor-specific policy semantics across differently modeled platforms.

• Monitor platform changes, new detection capabilities, and vendor guidance.

• Ensure the coverage model remains current as vendors implement changes.

• Establish appropriate tuning recommendations and evaluate agent output against that benchmark.

• Collaborate with the Attack team to ground technique coverage and detection expectations in contemporary adversary tradecraft.


⛳️ Requirements

• Over 6 years of experience in detection engineering, security operations, incident response, or threat hunting.

• Significant practitioner experience rather than exclusively advisory roles.

• Practical experience in administering and tuning EDR platforms.

• Proficient in writing detections, managing policies and exclusions, and investigating genuine alerts.

• Comprehensive understanding of SOC workflows that involve EDR output.

• Awareness of false-positive and false-negative trade-offs, alert fatigue, and detection coverage metrics.

• Strong familiarity with MITRE ATT&CK and detection coverage frameworks.

• Insight into post-compromise attacker behavior and endpoint and identity telemetry.

• Experience shaping a product or platform as a subject matter expert.

• Capability to influence without direct authority.

• Outstanding technical writing proficiency.

• Ability to effectively communicate between engineers, AI researchers, product managers, SOC analysts, and executives.

• Scripting skills, preferably in Python, for querying APIs, analyzing telemetry, and prototyping analyses.

• Comfort with SQL and handling large volumes of event and telemetry data.


🏝️ Benefits

• Equity package in the form of stock options for all full-time positions.

• Health, vision, and dental insurance for you and your family.

• Flexible vacation policy.

• Generous parental leave.

• Opportunities for career development.

• An inclusive and collaborative workplace culture.

• Remote and hybrid work arrangements based on role and location.

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