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Incident Response Expert III

Arsiem

Arlington, VA permanent

Posted: April 3, 2026

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Quick Summary

Incident Response Expert III is a full-time position with ARSIEM Corporation, fostering a partnership with government clients across the US.

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 Cyber Eviction Analyst to support on-site incident response to civilian Government agencies and critical asset owners who experience cyber attacks, providing immediate investigation and resolution. This position will support one of our Government clients in Arlington, VA.


Responsibilities:
• Serves as hunt and incident response subject matter expert (SME), applying in-depth knowledge on threat actor (TA) tools, techniques, and procedures (TTPs)

• Distills analytic findings into executive summaries and in-depth technical reports

• Provide expert support, analysis, and research with only broad direction into exceptionally complex problems and processes relating to the subject matter as it relates to hunt and incident response activities

• Serves as technical expert on high-level incident response teams providing technical direction, interpretation, and alternatives

• Exercises considerable latitude in determining technical objectives of an assignment or task at hand

• Independently develops technical solutions to complex problems that require the regular use of ingenuity and creativity

• Analyzes incident data and victim environments to recommend targeted mitigations

• Advise technical personnel on countermeasure implementation and customization

• Supports internal stakeholders on containment and eradication missions

• Documents analysis in a standardized knowledgebase for sharing and publication

• Assists in maintaining branch process and procedure documentation

• Guides the completion of hunt and incident response activities


Minimum Qualifications:
• BS Computer Science, Cyber Security, Computer Engineering, or related degree; or HS Diploma & 7+ years of technical experience in the area of expertise.

• 5+ years of directly relevant experience in the area of expertise

• Must be able to travel domestically on short notice

• Strong understanding of network architecture/security

• Experience performing cyber incident response

• Ability to think independently

• Demonstrates superior written and oral communication skills

• Must be able to work collaboratively across physical locations

• Skilled in identifying different classes of attacks and attack stages

• Understanding of system and application security threats and vulnerabilities

• Understanding of proactive analysis of systems and networks, to include creating trust levels of critical resources

• Proficiency with common operating systems (e,g, Linux/Unix, Windows)


Preferred Qualifications:
• Experience leading and mentoring technical teams

• Knowledge of Computer Network Defense policies, procedures and regulations

• Knowledge of different operational threat environments (e.g., first generation [script kiddies], second generation [non nation-state sponsored], and third generation [nation-state sponsored])

• Knowledge of system and application security threats and vulnerabilities (e.g., buffer overflow, mobile code, cross-site scripting, PL/SQL and injections, race conditions, covert channel, replay, returnoriented attacks, and malicious code)

• Network and System administration experience

• Strong understanding of adversarial tactics/techniques/procedures (TTPs)

• Experience with Identity and Access Management (IAM) tools

• Ability to review and analyze Enterprise Architecture (EA) from a security perspective

• Understanding of cyber defense-in-depth principles

• Hands-on skill in host/network intrusion detection

• Ability to perform event correlation

• Experience with malicious activity analysis

• Ability to collaborate with stakeholders at multiple levels within an organization

• Desired Certifications: One or more
DoD 8140.01 IAT Level II, IASAE II, CSSP Analyst
DoD 8140.01 GCIA, GCIH, CSSP Analyst/CSSP Incident Responder
DoD 8140.01 CEH, CSSP Analyst

• SANS GIAC GNFA preferred

• SANS GRID, GICSP, or GCIP a plus


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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