Information System Security Officer (ISSO)

Company: Harmonia Holdings Group
Location: Washington
Posted on: April 4, 2026

Job Description:

Harmonia Holdings Group, LLC is an award-winning, rapidly growing federal government contractor committed to providing innovative, high-performing solutions to our government clients and focused on fostering a workplace that encourages growth, initiative, creativity, and employee satisfaction. Description Title: Information System Security Officer (ISSO) Location: Washington, D.C. (Onsite) Terms: Full-time Clearance: Active Top Secret with SCI eligibility Travel: 0% Position Description Harmonia is seeking an experienced Information System Security Officer (ISSO) to support a mission-critical operations environment at the Department of State in Washington, DC. The ISSO will be responsible for ensuring compliance with government security policies and standards while providing oversight of system security, assessing risks, and implementing necessary security controls to safeguard classified systems and data. This position requires an active Top Secret clearance with SCI eligibility and U.S. citizenship. Veterans are encouraged to apply. Responsibilities: Implement and maintain security controls in accordance with government regulations, such as NIST 800-53, FISMA, and DoD Risk Management Framework (RMF). Monitor, evaluate, and maintain the security posture of systems, ensuring compliance with Security Technical Implementation Guides (STIGs) and other relevant security requirements. Develop and update System Security Plans (SSPs), Risk Assessments, Plan of Action and Milestones (POA&Ms), and other documentation to reflect the current system security state. Collaborate with system administrators, network engineers, and other IT staff to identify, mitigate, and document risks associated with system vulnerabilities and security threats. Ensure continuous monitoring of systems by reviewing audit logs, conducting vulnerability scans, and assessing the effectiveness of existing security controls. Provide support for security assessments and accreditation processes, ensuring that security controls are properly implemented and verified. Lead security control assessments and assist with audits and inspections from internal and external agencies. Serve as the point of contact for all system security-related matters and provide guidance to system owners on maintaining compliance with security regulations. Conduct regular security briefings and training to staff on the importance of maintaining security best practices within the SCIF environment. Respond to and manage security incidents, coordinating with relevant stakeholders to perform root cause analysis and remediation. Ensure that systems and networks comply with the Continuous Monitoring Program (CMP) and Incident Response Plan (IRP) for rapid detection and response to security events. Required Qualifications Active Top Secret clearance with SCI eligibility is required. 5 years hands-on experience with security controls and compliance frameworks (e.g. Risk Management Framework (RMF), NIST, FISMA, etc.), developing and maintaining System Security Plans (SSPs), Plan of Action and Milestones (POA&Ms) and other security documentation. Strong understanding of Security Technical Implementation Guides (STIGs) and hardening of systems. Strong experience as an Information System Security Officer (ISSO) or similar role within a SCIF or other highly secure government environments. Proven ability to implement, manage, and monitor security controls, assess vulnerabilities, and mitigate security risks. Hands-on experience with vulnerability management tools, SIEM solutions, and continuous monitoring technologies. Familiarity with security incident response procedures, including root cause analysis and remediation. Strong analytical and problem-solving skills with attention to detail. Excellent communication and collaboration skills to work effectively with technical teams and senior leadership. Desired Qualifications Relevant certifications such as Certified Information Systems Security Professional (CISSP), Certified Information Security Manager (CISM), or Certified Information Systems Auditor (CISA). Experience with classified systems accreditation processes and Continuous Diagnostics and Mitigation (CDM). Familiarity with security automation tools and processes. ___________________________________________________________________________________________________________ Here at Harmonia we are pleased to have been repeatedly recognized for our outstanding work culture, the innovative work we do, and the employees on our team who make a difference each day. Some of these recognitions include: Recognized as a Top 20 "Best Place to Work in Virginia" Recipient of Department of Labor's HireVets Gold Medallion Great Place to Work Certification for five years running A Virginia Chamber of Commerce Fantastic 50 company A Northern Virginia Technology Council Tech 100 company Inc. 5000 list of fastest growing companies for eleven years Two-time SBA SBIR Tibbett's Award winner Virginia Values Veterans (V3) Certification We recognize that every bit of our success is the result of our teams of hard-working, motivated, and innovative professionals who are proud to call themselves part of the Harmonia family! In addition to competitive compensation, a family-focused culture, and a dynamic, productive work environment, we offer all full-time employees a variety of benefits including, but not limited to Traditional and HSA- eligible medical insurance plans 100% employer-paid dental and vision insurance options 100% employer-sponsored STD, LTD, and life insurance 5% 401(k) company matching Flexible-schedules and teleworking options Paid holidays and PTO Accrual Plans Paid Parental Leave Professional development and career growth opportunities Team and company-wide events, recognition, and appreciation and so much more! Check out our LinkedIn , Facebook , and Instagram to find out a little more about who we are and if we are the right next step for your career! Harmonia is an Equal Opportunity Employer providing equal employment opportunity to all employees and applicants for employment without regard to race, color, religion, national origin, age, gender, gender identity, sexual orientation, disability, or genetics. Harmonia does and will take affirmative action to employ and advance in employment individuals with disabilities and protected veterans. To perform the above job successfully, an individual must possess the knowledge, skills, and abilities listed; meet the education and work experience required; and must be able to perform each essential duty and responsibility satisfactorily. Other duties in addition to those listed may be assigned as necessary to meet business needs. Reasonable accommodation will be made to enable an applicant with a disability to successfully apply for and/or perform the essential duties of the job. If you are in need of an accommodation, please contact HR@harmonia.com .

Keywords: Harmonia Holdings Group, Harrisburg , Information System Security Officer (ISSO), IT / Software / Systems , Washington, Pennsylvania