Jobs in the United States

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Added 1 min ago
Office Coordinator - Neurosurgery
Hartford HealthCare Medical Group
Vernon, CT
The Office Coordinator is responsible for managing the daily operations of the practice and performing a variety of administrative functions related to the daily operations of the practice.
Added 1 min ago
Food Service Associate - Skilled Nursing
Hartford HealthCare Senior Services at Southington Care Center
Southington, CT
…with thriving employees-- we provide a competitive benefits program designed to ensure work/life balance. Every moment matters. And this is your…
Added 1 min ago
Pro Sales Associate - Camarillo
Behr Sales LLC
CA
To thrive as a Pro Sales Associate, you must be approachable, organized, and genuinely interested in helping our customers. Some basic computer skills are necessary to use our customer…
Added 2 mins ago
Patient Care Technician (PCT) - Cardiac Medical - Memorial Regional Medical Center - PRN
Bon Secours Mercy Health
Mechanicsville, VA
Currently enrolled in or a graduate of an Associate’s or Bachelor’s degree (in any field) with no experience requirement. Must successfully complete the RSF PCT Training Program upon hire.
Added 2 mins ago
ED Technician Advanced - Emergency Department (ED) - Queen City Medical Center
Bon Secours Mercy Health
Cincinnati, OH
Other duties as assigned that are deemed necessary for department operations.
Added 2 mins ago
AR
Property Manager
Avenue5 Residential, LLC
Sandy, UT
- $80,000 to $85,000 USD / year
Perks and more: Mentoring. Professional development. Discounts. Tuition reimbursement. Robust recognition program. And we’re just getting started.
Added 2 mins ago
C
Warehouse Lead
Corning
Phoenix, AZ
- $28 to $31 USD / hour
Support verification of associate competency in applicable areas, including:
Added 3 mins ago
SH
Associate Manager, Service Desk & Operations
Sandy Hook Promise
Miami Gardens, FL
- $56,000 to $66,000 USD / year
The Associate Manager, Service Desk & Operations is a hands-on Tier 1/Tier 2 technology professional who independently owns day-to-day service desk operations, endpoint support activities,…
Added 3 mins ago
Team Lead
PACCAR
McKinney, TX
The Team Lead is responsible for overseeing the hour-by-hour operations on the manufacturing floor. This role supports Supervisors in managing daily production and distribution flows,…
Added 4 mins ago
Field Account Representative
Grainger Businesses
SAN MARCOS, CA
W.W. Grainger, Inc. is a leading broad line distributor with operations primarily in North America and Japan. At Grainger, We Keep the World Working® by serving more than 4.6 million…
Added 5 mins ago
PB
Teller (Part Time) - Balch Springs
PROSPERITY BANK
Balch Springs, TX
- Part-time
Required Knowledge: Understanding of Bank operations preferred.
Added 5 mins ago
Senior Underwriter - Nonprofit/Human Services
Church Mutual Insurance, S.I.
Remote, United States
…understanding CM Group, insurance industry coverages, policy forms, and operations specific to our niches. Professional knowledge development using external and internal…
Added 6 mins ago
Assistant Store Manager - Famous Footwear
Famous Footwear
MOSES LAKE, WA
Ace Retail Operations & Support Staffing Levels: You’ll know retail operational fundamentals like the back of your hand and put in the work so the store runs like a tightly laced sneaker.…
Added 6 mins ago
FF
Part-Time Sales Associate - Famous Footwear
Famous Footwear
CEDAR KNOLLS, NJ
- Part-time
As a Famous Footwear Sales Associate, you are passionate about providing the best shoe store experience for every customer. You do this by creating a welcoming environment and in-store…
Added 6 mins ago
FF
Part-Time Sales Associate - Famous Footwear
Famous Footwear
WICHITA, KS
- Part-time
As a Famous Footwear Sales Associate, you are passionate about providing the best shoe store experience for every customer. You do this by creating a welcoming environment and in-store…
Added 6 mins ago
FF
Part-Time Sales Lead - Famous Footwear
Famous Footwear
WICHITA, KS
- Part-time
Ace Retail Operations: You’ll know the ins-and-outs of your store like the back of your hand and enjoy putting in the work so it runs like a tightly laced sneaker– from pricing to…
Added 6 mins ago
Universal Banker
First Horizon Bank
West Monroe, LA · Monroe, LA
Assist client with loan application for personal/retail consumer needs and “handing off” the processing of these applications to the appropriate associate.
Added 6 mins ago
Universal Banker
First Horizon Bank
Monroe, LA
Assist client with loan application for personal/retail consumer needs and “handing off” the processing of these applications to the appropriate associate.
Added 7 mins ago
LC
Accounts Payable Supervisor
L.N. Curtis & sons
Walnut Creek, CA
- $85,000 to $95,000 USD / year
The Accounts Payable Supervisor is responsible for overseeing the daily operations of the accounts payable function, supervising a team of five employees and ensuring the accurate, timely,…
Added 7 mins ago
Store Manager
Ross Stores, Inc.
Oklahoma City, OK
Executes Customer service programs and Merchandise Presentation programs through Associate training and program supervision.
Added 7 mins ago
PB
Teller (Part Time) - Balch Springs
PROSPERITY BANK
Balch Springs, TX
- Part-time
Required Knowledge: Understanding of Bank operations preferred.
Added 8 mins ago
PB
Teller (Part Time) - Balch Springs
PROSPERITY BANK
Balch Springs, TX
- Part-time
Required Knowledge: Understanding of Bank operations preferred.
Added 9 mins ago
Bakery Clerk
Festival Foods
Kimberly, WI
At Festival, people are at the top of our list. You’ll see it in everything from our daily interactions to how we treat our guests – even in our extensive associate benefits and programs.
Added 10 mins ago
APS Investigator Specialist
TX-HHSC-DSHS-DFPS
BEEVILLE, TX
DFPS is committed to its employees' professional development and ongoing success and offers the DFPS Certification Program to enhance skills and advance careers within our organization. The…
Added 11 mins ago
Onsite Coordinator
Manpower
Bernville, PA
…of the Client Services team supporting onsite staffing and associate engagement. The ideal candidate will have strong relationship-building skills, a goal-oriented mindset, and the ability…

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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