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Added 1 min ago
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Software Engineer Data & AI II (Full Time) – United States
Cisco
San Jose, CA
- Full-time
You are a passionate software engineer with expertise in developing scalable data pipelines, designing robust analytics platforms, and building infrastructure to support machine learning…
Added 1 min ago
C
ASIC DFT Engineer I (Full Time) - United States
Cisco
San Jose, CA
- Full-time
You will be in the Silicon One development organization as an ASIC Design for Test Engineer with a primary focus on Design-for-Test. You will work with frontend RTL teams, backend Physical…
Added 1 min ago
Senior Site Reliability Engineer
Taskrabbit
San Francisco, CA
We are looking for a Senior Site Reliability Engineer to join our Site Reliability Engineering team at Taskrabbit and help improve the reliability, scalability, and operational maturity of…
Added 1 min ago
IT Systems Administrator (Multiple Levels)
Noblis
Chantilly, VA
…communication, deployment, and authentication platforms. The engineer delivers Tier II/III advanced engineering support and handles limited Tier I troubleshooting, escalations as needed,…
Added 1 min ago
Platform Software Engineer
Ford
Dearborn, MI · Dearborn
A Platform Software Engineer is a versatile developer with expertise in Java or Python and a strong foundation in cloud platforms to build and manage applications at scale. Generally,…
Added 1 min ago
EH
Full Stack Engineer, Kouper
Ellipsis Health
New York, NY
- $160,000 to $210,000 USD / year
We're seeking a Senior Full Stack Engineer to build the backbone our AI agents rely on. An agent is only as good as the systems it can act on, and in this role you'll design the APIs,…
Added 2 mins ago
Platform Software Engineer
Ford Global
Dearborn, MI
A Platform Software Engineer is a versatile developer with expertise in Java or Python and a strong foundation in cloud platforms to build and manage applications at scale. Generally,…
Added 5 mins ago
Senior Data Engineer
Nextech
Remote, United States
If you are a software engineer, finance or accounting professional, customer support specialist, or a business development expert with a passion for healthcare technology (just to name a…
Added 6 mins ago
Software Engineer - AI
PNC
Pittsburgh, PA · Birmingham, AL · Denver, CO · Strongsville, OH · Dallas, TX
…opportunity to contribute to the company’s success. As a(n) Software Engineer - AI within PNC's technology organization, you will be based in Pittsburgh, PA, Dallas, TX, Strongsville, OH,…
Added 6 mins ago
Artificial Intelligence Software Engineer
PNC
Pittsburgh, PA · Birmingham, AL · Denver, CO · Strongsville, OH · Dallas, TX
…contribute to the company’s success. As a(n) Artificial Intelligence Engineer within PNC's technology organization, you will be based in Pittsburgh, PA, Dallas, TX, Strongsville, OH,…
Added 6 mins ago
Software Engineer - AI Agents / Generative AI
PNC
Pittsburgh, PA · Birmingham, AL · Denver, CO · Strongsville, OH · Dallas, TX
…opportunity to contribute to the company’s success. As a Software Engineer - AI Agents / Generative AI within PNC's technology organization, you will be based in Pittsburgh, PA, Dallas, TX,…
Added 6 mins ago
RD
MES Application & Integration Expert
Roche Diabetes Care, Inc.
United States
- $85,000 to $157,800 USD / year
We are seeking a proactive and skilled MES Engineer with 4+ years of experience to support, configure, and integrate Manufacturing Execution Systems within our production facility. In this…
Added 7 mins ago
Senior Software Engineer, AI Platform - Prism
SoFi
Seattle, WA
As a Senior Software Engineer (IC3) on SoFi’s Prism team, you’ll help build Prism, SoFi’s internal AI platform for knowledge work. Prism connects employees with the AI models, business…
Added 8 mins ago
K
Senior IT Infrastructure UNIX Engineer
Kforce
Sunnyvale, CA
- $59 to $81 USD / hour
Kforce is immediately seeking a Senior IT Infrastructure UNIX Engineer in support of our enterprise storage and compute customer based in Sunnyvale, CA.
Added 9 mins ago
Software Engineer III
Assurity
Lincoln, NE
As a Software Engineer III, you’ll take responsibility for the design and delivery of a specific application, platform, or system, including mid-to-large AI and automation solutions and…
Added 9 mins ago
Senior Software Engineer
Assurity
Lincoln, NE
As a Senior Software Engineer, you’ll own the technical health of multiple systems, lead large projects independently with or without an assigned business analyst, and build the hardest…
Added 9 mins ago
Software Engineer II
Assurity
Lincoln, NE
As a Software Engineer II, you’ll deliver working software and moderate AI and automation solutions that move the business forward, from a proof of concept built in hours to a tested,…
Added 9 mins ago
Cyber Security Engineer (5462)
SMX
Little Rock, AR
The Cyber Security Engineer will provide security engineering, compliance, and risk management support for cloud-based systems aligned with NIST SP 800-53, FedRAMP, and DoD IL4–6…
Added 9 mins ago
Advanced Forward Engineering - Implementation Engineer - Senior
EY
Little Rock, AR · Rogers, AR
…and trusted in production. This role is ideal for a seasoned engineer who excels at owning ambiguous problems, making pragmatic tradeoffs, and turning platform capabilities into real…
Added 9 mins ago
Head of Forward Deployed Engineering
Bausch + Lomb
Little Rock, AR
Bausch + Lomb is seeking a Head of Forward Deployed Engineer (FDE) to turn AI from pilots into production capability across B+L. This is a hands-on builder role embedded in manufacturing,…
Added 9 mins ago
Lead Software Engineer
Highmark Health
Little Rock, AR
The job is an integral member of an agile software engineer team responsible for building scalable software applications across all digital channels to serve our customers. The position…
Added 9 mins ago
Associate Software Engineer
Highmark Health
Little Rock, AR
This job is an integral member of an agile software engineer team responsible for building scalable software applications across all digital channels to serve our customers. Responsible for…
Added 10 mins ago
Lead Engineer
PwC
Little Rock, AR · Fayetteville, AR
As a Lead Engineer you will guide the design, build, testing, and modernization of custom applications across cloud-native and on-premise environments, using modern engineering approaches,…
Added 10 mins ago
Senior Engineer
PwC
Little Rock, AR · Fayetteville, AR
As a Senior Engineer you will help design, build, and test custom applications within our Advisory practice, bringing together software engineering, cloud-based solution delivery, and…
Added 10 mins ago
Vice President, Cloud Platform Engineer
SitusAMC
Little Rock, AR
…Docker, Kubernetes, and familiar with Git development. The Engineer is expected to provide strategy and implement enterprise-scale automation for scalability, performance, security, and…

ARSIEM

Subject Matter Expert I

Arlington, VA, United States

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Job details

Experience: 10+ years of directly relevant experience
Posting language: English
Posted: Nov 5, 2026

Original job description

About ARSIEM Corporation

At ARSIEM Corporation we are committed to fostering a proven and trusted partnership with our government clients. We provide support to multiple agencies across the United States Government. ARSIEM has an experienced workforce of qualified professionals committed to providing the best possible support.

As demand increases, ARSIEM continues to provide reliable and cutting-edge technical solutions at the best value to our clients. That means a career packed with opportunities to grow and the ability to have an impact on every client you work with.

ARSIEM is looking for a Senior Detection Engineer. The Senior Detection Engineer develops, validates, deploys, and tunes detection logic supporting proactive threat hunting across federal and critical infrastructure environments. The role combines advanced threat hunting tradecraft, adversary behavior analysis, and detection engineering to identify sophisticated threats, close visibility gaps, and improve detection effectiveness.

The engineer translates threat intelligence, hunt findings, and incident response lessons into reliable behavioral analytics, investigative queries, and automation. This work moves the team beyond individual hunts toward faster, repeatable, and scalable operations. Working across endpoint, network, identity, and cloud telemetry, the engineer selects detection methods based on available evidence and mission requirements. The position serves as the technical bridge between threat hunters, technical delivery teams, system engineers, analytics developers, and data scientists, turning operational findings into validated detections, automation, sensing improvements, and actionable capability requirements.

This position will support one of our Government clients in Arlington, VA.

Responsibilities

Develop and test hypotheses to uncover persistence, privilege escalation, credential access, lateral movement, command and control, and defense evasion.
Correlate evidence across data sources and document defensible conclusions.
Build behavioral analytics, correlation rules, signatures, and queries using endpoint, network, identity, cloud, and application telemetry.
Target adversary techniques and activity sequences rather than individual indicators of compromise.
Convert validated hunt methods, incident findings, and exercise results into reusable detections.
Document each detection’s purpose, data requirements, investigative guidance, assumptions, and known limitations.
Translate remaining gaps into technical requirements and acceptance criteria, recommend priorities through Threat Hunting governance, and verify that delivered capabilities meet the operational need.
Test detections against representative malicious and benign activity using historical telemetry, controlled simulations, and purple team exercises.
Verify intended behavior, evaluate evasion opportunities, and retain test evidence.
Analyze false positives, false negatives, alert volume, thresholds, exclusions, and environmental baselines.
Improve detection fidelity and alert context through enrichment and prioritization, while assessing the risk of suppressing legitimate threat activity.
Assess the availability, reliability, and quality of sensors, tools, and data sources.
Identify collection, parsing, normalization, and retention gaps and explain their impact on active hunts and production detections.
Coordinate remediation with infrastructure teams and validate restored coverage.
Develop and maintain automation for enrichment, query execution, analytical workflows, and detection validation, including SOAR playbooks where applicable.
Tune data pipelines and queries for speed and responsiveness.
Build in review, error handling, and recovery procedures.
Maintain version-controlled content, peer reviews, release criteria, approval records, and rollback procedures.
Revalidate analytics after platform, schema, environmental, or adversary tradecraft changes.
Coordinate with hunters, incident responders, intelligence analysts, and platform engineers to integrate detections into investigative and automated workflows.
Measure validated detection coverage, fidelity, actionable findings, and remaining gaps.
Communicate the operational significance of technical findings and avoid equating rule counts with effective coverage.
Partner with analytics developers and data scientists to develop and validate advanced analytics, including machine learning where appropriate.
Assess operational value, false positives, data dependencies, and analytical limitations.
Provide technical leadership supporting the section focal point for vulnerability management (VM) and threat hunting (TH) activities under applicable authorities.
Develop exercises cenarios and expected detection outcomes, assess sensing failures, and track corrective actions.
Evaluate new tools, data sources, and analytical methods against identified mission gaps.
Document test results, operational limitations, and adoption recommendations.
Review analytical work, mentor analysts, and set standards for query development, documentation, testing, deployment, and tuning.
Develop and maintain detection engineering competencies, Job Qualification Requirements (JQRs), training scenarios, and practical assessments in coordination with section leadership.

Minimum Qualifications

Bachelor's degree in Engineering, Computer Science, Cybersecurity, Information Systems, or related field (Master's Degree preferred)
10+ years of directly relevant experience
Demonstrated senior-level experience in threat hunting, detection engineering, incident response, or closely related defensive cyber operations, including independent ownership of production detection content.
Strong command of hypothesis development, adversary behavior analysis, iterative investigation, and evidence-based conclusions.
Proven ability to develop, test, deploy, and tune production detections, explain their limitations, and assess the effects of exclusions and suppression.
Advanced proficiency in one or more security query languages (KQL, SPL, EQL, ES|QL, or vendor-specific EDR languages), with the ability to adapt and optimize logic across platforms.
Experience analyzing process execution, command lines, process ancestry, authentication, persistence mechanisms, network connections, and related enterprise telemetry.
Understanding of Windows and Linux internals, enterprise networking, identity systems, cloud telemetry, and sophisticated adversary tradecraft.
Practical experience mapping detections to MITRE ATT&CK and explaining the telemetry, test evidence, and limitations behind coverage claims.
Proficiency in Python and PowerShell, or comparable languages, for analysis, enrichment, testing, and automation.
Ability to clearly document detection intent, logic, validation results, investigation steps, and tuning decisions.
Experience translating operational findings into engineering requirements and acceptance criteria, validating sensing effectiveness, and coordinating improvements across hunt analysts and delivery teams.

Preferred Qualifications

Experience with CrowdStrike Falcon, Microsoft Defender, Cortex XDR, SentinelOne, Elastic, Splunk, or comparable platforms.
Experience with portable detection content such as Sigma
Experience with detection-as-code and automated testing
SIEM data onboarding and pipeline tuning experience
Experience with adversary emulation and cyber exercise development
Federal civilian or critical infrastructure cyber operations experience
Experience with maintaining detection engineering competencies, Job Qualification Requirements, training scenarios, and practical assessments
GIAC Certified Detection Analyst (GCDA)
GIAC Certified Forensic Analyst (GCFA)
GIAC Defending Advanced Threats (GDAT)
GIAC Certified Intrusion Analyst (GCIA)
GIAC Certified Incident Handler (GCIH)
GIAC Cyber Threat Intelligence (GCTI)
Microsoft Certified: Security Operations Analyst Associate (SC-200)
Certified Information Systems Security Professional (CISSP)

Clearance Requirement: This position requires an Active TS/SCI clearance and the ability to obtain Department of Homeland Security (DHS) Entry on Duty (EOD) Suitability.

Candidate Referral: Do you know someone who would be GREAT at this role? If you do, ARSIEM has a way for you to earn a bonus through our referral program for persons presenting NEW (not in our resume database) candidates who are successfully placed on one of our projects. The bonus for this position is $3,500, and the referrer is eligible to receive the sum for any applicant we place within 12 months of referral. The bonus is paid after the referred employee reaches 6 months of employment.

ARSIEM is proud to be an Equal Opportunity and Affirmative Action Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability or veteran status, age, or any other federally protected class.

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More about this job

Skills

Computer science
Cybersecurity
Incident response
Query languages
Microsoft Windows
Linux
MITRE ATT&CK
Python
Microsoft PowerShell
Splunk
Test automation
Onboarding
CISSP

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