Information Systems Security Engineer (ISSE) with Security Clearance

D2 Consulting; Arnold (MO); On-site; USD 120,000 - 130,000; Full time

Benefits offered by this job

Health/Dental/Vision

401(k) match

Accrued PTO

Life Insurance

Referral Bonuses

Job summary

D2 Consulting is seeking a senior Information Systems Security Engineer (ISSE) in Arnold, MO. This role requires an active TS/SCI clearance and hands-on experience across policy, architecture, and incident response to protect critical systems for government customers.

You’ll lead RMF/C&A activities, advise on secure design, and coordinate with cross-functional teams to implement robust security controls. A Bachelor’s degree and DoD 8570.01-M Level II certification are expected.

Qualifications

• 10+ years of information security experience or equivalent
• Active TS/SCI clearance
• IAM Level II certification per DoD 8570.01-M to start
• Experience with RMF and ICD 503 processes
• Experience with security tooling and cloud infrastructure (AWS)
• Scripting on UNIX/RHEL and PowerShell
• Knowledge of Windows AD and virtualization (VMware)
• Strong networking knowledge including VLANs
• Bachelor's degree in CS or related field

Responsibilities

• Draft and oversee security policy, MOAs, and SSPs
• Lead Certification & Accreditation (C&A) and RMF activities
• Review POA&Ms and drive remediation actions
• Advise on secure system design with developers and PMs
• Configure and maintain network security infrastructure and tools
• Conduct forensic log analysis and respond to alerts
• Deliver security awareness training and present findings to leadership
• Engage with multi-agency stakeholders to support operations

Skills

Security engineering

Policy & RMF

Incident response

Stakeholder engagement

Education

Bachelor’s degree in Computer Science or related field

Tools

ACAS

HBSS

Carbon Black

Tanium

RedSeal

EMET

AWS

UNIX/RHEL scripting

PowerShell

Active Directory

VMware

Job description

Information Systems Security Engineer (ISSE) Arnold, MO

Apply ACTIVE TS/SCI SECURITY CLEARANCE REQUIRED

Protect What Matters Most

Cyber threats don't take days off — and neither does the mission. As an Information Assurance Security Engineer supporting our Intelligence Community customer, you'll be a trusted voice on all things security: from policy and architecture to incident response and compliance. Your expertise will directly shape how systems are built, protected, and sustained in one of the most consequential environments in the country. If you're a seasoned security professional who thrives at the intersection of policy, engineering, and operations — and you want your work to mean something — keep reading.

What You'll Be Doing

Policy, Compliance & Accreditation

• Draft and review information security policies, Memoranda of Agreement (MOAs), and System Security Plans (SSPs)
• Lead and coordinate all aspects of Certification & Accreditation (C&A) and Risk Management Framework (RMF) processes
• Review Plan of Action & Milestones (POA&Ms) and drive technical remediation and lien resolution

Architecture & Engineering

• Ensure IA hardware, software, and configurations comply with established security guides and A&A documentation
• Advise on system design and architecture from a security-first perspective — working with developers, engineers, and project managers to build protection in from day one
• Define, design, and evaluate information security systems and multi-agency integration security

Operations & Incident Response

• Perform advanced configuration and maintenance of network security infrastructure: firewalls, web/mail gateways, IDS, load balancers, and performance monitoring tools
• Conduct forensic traffic and log analysis to isolate issues and respond to analyst alerts
• Initiate protective and corrective measures when incidents or vulnerabilities are discovered
• Execute vulnerability remediation using ACAS security scans and related tools

Stakeholder Engagement & Training

• Respond to escalated troubleshooting requests and support O&S functions for network security infrastructure
• Maintain relationships with senior personnel across multiple agencies involved in information security
• Develop and deliver security awareness training to ensure users understand their responsibilities before system access
• Present monitoring results, test reports, and findings to leadership as required

What We're Looking For (Required)

• 10+ years of experience in information security, data security administration, or a related discipline
• Active TS/SCI clearance
• IAM Level II certification (per DoD 8570.01-M) required to start
• Working knowledge of ICD 503 and RMF processes
• Experience with security tools: ACAS, HBSS, Carbon Black, Tanium, RedSeal, and/or EMET
• Experience with Cloud Infrastructure / AWS-based solutions
• Scripting experience on UNIX and/or RHEL operating systems
• Experience with Microsoft PowerShell and complex macro scripting
• Hands-on experience installing, hardening, and troubleshooting network perimeter security technologies
• Working knowledge of Windows Enterprise Active Directory and VMware virtualization
• Solid understanding of network routing and VLAN technologies
• Bachelor's degree in Computer Science, a related field, or equivalent experience

Bonus Points For

• CISSP or equivalent certification (CAP, GSLC, CISM)
• System or network administration background
• System design and development experience

What to Expect Day-to-Day

This is a senior role with real responsibility and real variety. No two days look exactly alike — you might be reviewing an architecture proposal in the morning, investigating a security alert in the afternoon, and briefing leadership on remediation progress before the day is out. You'll work across IT teams, interface with multi-agency stakeholders, and be the kind of trusted advisor that programs depend on. The environment is fast-paced, team-oriented, and the mission is always in focus.

Additional Information

• All your information will be kept confidential according to EEO guidelines.
• Compensation is unique to each candidate and relative to the skills and experience they bring to the position. The salary range for this position is typically $120-130k. This does not guarantee a specific salary as compensation is based upon multiple factors such as education, experience, certifications, and other requirements, and may fall outside of the above-stated range.
• Highlights of our benefits include Health/Dental/Vision, 401(k) match, Accrued PTO, STD/LTD/Life Insurance, Referral Bonuses, professional development reimbursement, and more! D2 Technical Services is committed to a merit-based recruitment process and encourages applications from all qualified individuals.

As a Veteran-Owned Small Business, we particularly welcome applications from veterans who have the requisite skills and experience.

Job applicants that are interested in one of our openings and may require a reasonable accommodation to participate in the job application or interview process, should contact us to request an accommodation.