Senior Detection Portfolio Engineer

Full Job Description

Own an assigned threat actor and partner portfolio end-to-end, including onboarding, offboarding, and tuning decisions, each with explicit written rationale. Partner directly with investigation and hunt leads to translate investigation, hunt, and incident findings into detection ideas, and author high-fidelity detections against those ideas using Kusto and our detection platform. Gate and approve detections and detection ideas and detection submissions from partner teams against our priorities and charter; return ideas that fail gating with clear, actionable rationale and resubmission guidance. Review detections authored by others, including partner-team submissions, for intent fidelity, query performance, and production reliability. Hold the portfolio to an investigator case budget. Make explicit coverage-versus-noise tradeoffs and drive volume down without surrendering coverage on the behaviors that matter. Select, engineer, tune, and leverage AI-assisted and automation frameworks for all aspects of the detection lifecycle: tuning, gating, triage, and investigation. Serve as the primary interface to partner detection teams and to our investigations partners, routing authoring work to the right owner and enforcing the engagement contract. Participate in the detection workstream on-call rotation and lead the detection workstream during incidents: establish whether a detection fired and why, decide whether we author, decide whether we can leverage an existing detection, and drive that work at incident speed. Maintain an evidence-backed view of detection coverage for your portfolio and produce leadership-ready updates on a regular operating rhythm. Doctorate in Statistics, Mathematics, Computer Science, or related field OR Master's Degree in Statistics, Mathematics, Computer Science, or related field AND 3+ years experience in software development lifecycle, large-scale computing, threat modeling, cyber security, anomaly detection, Security Operations Center (SOC) detection, threat analytics, security incident and event management (SIEM), information technology (IT), or operations incident response These requirements include, but are not limited to the following specialized security screenings: Citizenship & Citizenship Verification: This role will require access to information that is controlled for export under export control regulations, potentially under the U.S. International Traffic in Arms Regulations or Export Administration Regulations, the EU Dual Use Regulation, and/or other export control regulations. As a condition of employment, the successful candidate will be required to provide either proof of their country of citizenship or proof of their U.S. permanent residency or other protected status (e.g., under 8 U.S.C. 1324b(a)(3)) for assessment of eligibility to access the export controlled information. To meet this legal requirement, and as a condition of employment, the successful candidate's citizenship will be verified with a valid passport. Lawful permanent residents, refugees, and asylees may verify status using other documents, where applicable. Citizenship & Citizenship Verification: This position requires verification of citizenship due to citizenship-based legal restrictions. Specifically, this position supports United States federal, state, and/or local government agency customers and is subject to certain citizenship-based restrictions where required or permitted by applicable law. To meet this legal requirement, and as a condition of employment, the successful candidate's citizenship will be verified with a valid passport 3+ years in a security operations role — SOC analyst (Tier 1/2/3), threat hunter, or incident investigator — with direct responsibility for triaging, investigating, and closing real adversary activity. Demonstrated ability to author production detection logic independently, start to finish, and to optimize existing detections for signal quality and query performance. Excellent Kusto (KQL) proficiency, including performance tuning against large data lakes. Working fluency in threat actor tradecraft and MITRE ATT&CK, sufficient to engage, without support, with threat intelligence and hunt teams about technique-to-actor mapping, detection intent, and detection syntax. Experience making and defending offboarding or deprecation decisions on security controls, including the ability to say no to a partner team and make it stick. Comfort with detection quality concepts: signal-to-noise ratio, precision, recall, gating criteria, and true-positive validation. Comfort building and using automation and AI-assisted tooling (Python, notebooks, LLM-based workflows) to scale analysis and detection work, and related tools (Jupyter, Synapse). Ability to operate with autonomy influence others without authority structure unstructured problems provide clarity where ambiguity exists.

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