Senior Security Specialist – ISSO

Alpha Omega Company; Washington; On-site; USD 86,000 - 120,000; Full time

Job summary

A leading Federal IT solutions provider in Washington, DC is seeking an experienced Senior Security Specialist to ensure compliance with cybersecurity policies and support security controls implementation. The ideal candidate has over 5 years of ISSO experience and holds a relevant bachelor's degree. This full-time position offers a competitive salary and various benefits.

Benefits

PTO including paid parental and military leave

Health and Dental Insurance

401(k) with a match

Tuition & Professional Development Reimbursement

Qualifications

• 5+ years of experience as ISSO.
• Highly responsive to customer needs.

Responsibilities

• Provide subject matter expertise to ensure compliance with cybersecurity policies.
• Support the implementation and sustainment of security controls.
• Assist system owners in maintaining Authorization to Operate status.

Skills

Customer responsiveness

Cybersecurity compliance expertise

Education

Bachelor’s degree in computer science or related field

Tools

Cloud environments

Agile and DevOps environments

Job description

Treasury COSS (CS) – Washington, DC

Overview

Job Title: Senior Security Specialist – ISSO

Clearance Required: US Citizen; Public Trust

Work Location: Onsite at the Department of Treasury, 1500 Penn Ave, Washington, DC.

Responsibilities

• Provide subject matter expertise to ensure compliance with Treasury, DHS, and NIST cybersecurity policies and frameworks.
• Support the implementation and sustainment of security controls in alignment with the NIST Risk Management Framework (RMF).
• Assist system owners in maintaining Authorization to Operate (ATO) status.
• Enhance Treasury’s ability to measure, report, and manage cybersecurity posture and control effectiveness at a maturity level consistent with OIG FISMA Metrics Level 4 (Managed and Measurable).
• Strengthen collaboration and information sharing across internal Treasury offices and external partners to support cybersecurity risk reduction and resilience.
• Create and maintain documents like SSPs, POA&Ms, SARs, and other continuous monitoring reports/artifacts.

Qualifications

Education

• Bachelor’s degree in computer science, Information Technology, or related field (or commensurate experience and education).

Experience/Skills

• 5+ years of experience as ISSO.
• Highly responsive to customer needs.

Preferred Qualifications

• Experience supporting systems hosted in Cloud environments.
• Experience supporting systems in Agile and DevOps environments.

Certifications (Must have one certification):

• Certified Information Systems Security Professional (CISSP)
• CompTIA Advanced Security Practitioner (CASP)
• Certified Information Systems Auditor (CISA)
• Certified Ethical Hacker (CEH)
• Certified Information Security Manager (CISM)

Salary and Benefits

The likely salary range for this position is $86,000 - $120,000. Final pay is determined by factors including experience, skills, certifications, education, and contract provisions.

Application Deadline

12/15/2025.

Benefits

• PTO including paid parental, military, and bereavement leave
• Eleven (11) paid Federal holidays, five of which are floating
• Health and Dental Insurance with employer-paid premiums for employee coverage under the HDHP
• Life Insurance, STD/LTD
• 401(k) with a match
• FSA/DFSA/HSA
• Annual Tuition & Professional Development Reimbursement

Culture and Values

Guided by our core values—Harmony, Engagement, Accountability, Resourcefulness, and Tenacity (HEART)—we foster a culture of innovation, collaboration, and continuous learning. We recognize and reward hard work through programs like the H.E.A.R.T. Awards.

About Alpha Omega

Alpha Omega is an award-winning Federal IT solutions provider delivering mission-enabling technology and cybersecurity services across several domains. We are committed to supporting agency partners and ensuring the safety, security, and well-being of future generations.

Equal Opportunity Employer/Protected Veterans/Individuals with Disabilities. All qualified applicants will receive consideration without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability, or veteran status. This employer is required to notify all applicants of their rights pursuant to federal employment laws.

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