MSS Senior Security Specialist

nooks; Colorado Springs (CO); On-site; USD 120,000 - 135,000; Full time

Job summary

Nooks in the United States is seeking a Senior Security Specialist to own end-to-end security operations across a multi-client MSS portfolio, serving as an Assistant FSO and driving compliance with DCSA requirements.

You will lead onboarding, risk mitigations, and incident response, mentoring Security Specialists and ensuring audit readiness. An active Secret clearance is required, with expertise in 32 CFR Part 117 and DISS/NBIS.

Qualifications

• 5+ years of personnel or industrial security experience.
• Mastery of DISS and NBIS and 32 CFR Part 117 (NISPOM).
• Active Secret security clearance is required.

Responsibilities

• Manage end-to-end industrial security operations for a portfolio of complex, high-touch client accounts, executing personnel security actions in DISS and NBIS, visit authorizations, security briefings, and roster maintenance under each client’s appointed FSO.
• Guide clients through the FOCI process by assisting with SF-328 disclosures and reviewing DCSA-issued risk mitigation documentation (including Special Board Resolutions, TCPs, ECMPs, etc).
• Interpret complex 32 CFR Part 117 (NISPOM) requirements to deliver clear, defensible compliance guidance tailored to fast-growing, non-traditional defense contractors.
• Act as the primary internal escalation point for Security Specialists facing complex casework before issues are elevated to the Group Lead.

Skills

Security operations

DISS/NBIS mastery

DCSA interactions

Regulatory compliance

Clear communication

Tools

DISS

NBIS

Job description

ABOUT NOOKS

Nooks is pioneering Classified-Infrastructure-as-a-Service (CIaaS) - designing, building, and operating Sensitive Compartmented Information Facilities (SCIFs) and other secured, classified environments for the defense and national security community. We work with the agencies, contractors, and mission-driven organizations that keep the nation safe, delivering the physical infrastructure that makes classified work possible. We’re growing fast, operating across multiple markets, and building a company that takes both the mission and the business seriously.

About the Role

Through our Managed Security Services (MSS) product line, we serve as the outsourced security function for a growing portfolio of defense tech companies and mission-driven organizations navigating the complex, opaque world of government security compliance. Our MSS team is the outsourced Facility Security Officer (FSO) behind that portfolio.

As MSS grows, the hardest client work - first-time facility clearances (FCLs), foreign ownership questions, incidents and security violations, or DCSA security reviews - needs someone who can own it end-to-end without a manager in the room. As a Senior Security Specialist, you will carry the most complex accounts in our active portfolio, drive high-touch client onboarding, and set the quality bar for the specialists around you, reporting to the Group Lead as a team contributor. This is a senior delivery seat, not a people-management seat - people management begins at Group Lead. You support under each client's appointed FSO; MSS staff act as Assistant FSOs (AFSOs) to manage operational execution, and not as the client’s appointed FSO.

In MSS, we move fast. Managing security operations across a multi-client portfolio means you’ll handle multiple customer environments simultaneously, context-switch between priorities, and adapt quickly when urgent client or government needs arise. We’re looking for a proactive problem-solver who thrives in a dynamic environment, balances competing deadlines effortlessly, and is ready to lean in wherever the team needs them to keep our client portfolio compliant and mission-ready.

Key Responsibilities

• Manage end-to-end industrial security operations for a portfolio of complex, high-touch client accounts, executing personnel security actions in DISS and NBIS, visit authorizations, security briefings, and roster maintenance under each client’s appointed FSO.
• Guide clients through the FOCI process by assisting with SF-328 disclosures and reviewing DCSA-issued risk mitigation documentation (including Special Board Resolutions, TCPs, ECMPs, etc).
• Interpret complex 32 CFR Part 117 (NISPOM) requirements to deliver clear, defensible compliance guidance tailored to fast-growing, non-traditional defense contractors.
• Act as the primary internal escalation point for Security Specialists facing complex casework before issues are elevated to the Group Lead.

Incidents/Violations, Government Interaction, & Client Onboarding

• Lead end-to-end response for adverse information, security violations, and reportable incidents, coordinating government notifications and mitigation directly with DCSA under the client's FSO authority.
• Drive new client onboarding from initial gap assessment and KMP alignment through program stand-up, establishing compliant baseline security operations before transitioning routine maintenance to Security Specialists.
• Prepare clients for annual DCSA Continuous Monitoring and Security Reviews, leading pre-audit self-inspections and driving corrective action plans to full closure.

Quality Control, Peer Review & Mentorship

• Review and sign off on high-impact client deliverables, eAPP packages, and routine system actions in DISS/NBIS completed by Security Specialists, upholding audit-readiness and accuracy across all accounts.
• Mentor Security Specialists on advanced compliance workflows, client relationship management, and DCSA interactions without carrying direct people-management responsibilities.
• Establish and enforce quality assurance standards across all external client communications, security documentation, and official filings.

Operational Excellence & Product Feedback

• Standardize recurring client challenges into reusable templates, playbooks, standard operating procedures (SOPs), and compliance checklists for the broader MSS team.
• Feed recurring client needs and tooling gaps to the Group Lead and Digital.
• Refine onboarding and self-inspection approaches so the team runs them consistently across clients.

What Success Looks Like in This Role

You independently run a portfolio of our most complex client accounts — guiding them through first-time facility clearances, FOCI mitigations (like TCPs or ECMPs), and high-priority incident reporting — ensuring seamless DCSA reviews without last-minute scrambles. When a client faces a reportable incident, security violation, or government review, you handle the interaction from start to finish under the client’s appointed FSO, earning the trust of both client leadership and DCSA. The Security Specialists whose work you review produce higher-quality, audit-ready deliverables with fewer errors over time because your sign-off serves as active coaching. New clients you onboard reach a steady operational state faster because you establish a compliant, scalable foundation from day one.

Cross-Functional Expectations

You will work within the MSS team — mentoring Security Specialists and partnering with your Group Lead and the Senior Director of Solutions — as all MSS customer work is owned and delivered within MSS. Your collaboration will help balance portfolio workloads, address capacity constraints early, and share best practices across the team. Externally, you serve as the trusted operational bridge between client executives (such as appointed FSOs and SMOs) and government officials, translating complex regulatory requirements into practical, business-friendly execution.

The Skillset

• 5+ years of personnel or industrial security experience, with a track record of owning client or program security work independently.
• Mastery of DISS and NBIS and working depth in 32 CFR Part 117 (NISPOM), including self-inspections, incidents, and reporting.
• Direct experience interacting with DCSA - reviews, reportable incidents, or violation response.
• Sound judgment on gray-area security questions, with the ability to document a defensible rationale.
• Clear communication and the credibility to review peers’ work and represent Nooks to client leadership.

Preferred

• DCSA FSO Program Management certification and Security Professional Education Development (SPeD) Security Fundamentals Professional Certification (SFPC).
• Experience with first-time facility clearance (FCL) sponsorship or Foreign Ownership, Control, or Influence (FOCI)-mitigated clients.
• Prior work in a defense-tech, startup, or multi-client services environment.

Eligibility & Clearance

Candidates must be authorized to work in the United States. An active Secret security clearance is required.

Salary Range for all departments

Salary Range

$120,000 - $135,000 USD

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