Information Systems Security Manager (ISSM)

Adelphi • Washington, DC

1d • Onsite

About The Position

Adelphi builds AI/ML-enabled secure data access and sharing technology for the U.S. intelligence and defense communities, using its Connector software product to enable federated data discovery that cuts intelligence-sharing time from months to minutes. The company's mission is to eliminate data silos, build trust in automation without compromising security, and improve information flow across mission-critical environments. Adelphi closed a $7M Seed round in August 2025 and has Customers across the Intelligence Community and the Department of War.

As Adelphi’s first ISSM, you will own the security program for Adelphi. You will drive Adelphi’s work through Dept of War authorization on the IL2 (NIPR) path and onto a defensible IL5 trajectory, operating on a continuous-ATO cadence that matches our weekly sprint pace. This role sits at the intersection of security architecture, compliance program management, and day-to-day security operations. You will be the primary interface to the Dept of War Authorizing Official, assessors, and our customer program office, while working shoulder-to-shoulder with a small, high-velocity engineering team.

Requirements

• Active Top Secret/SCI clearance.
• Owned a government security program end-to-end, from initial authorization through continuous monitoring.
• Personally led at least one DoD or IC system through the NIST RMF authorization process to an ATO and sustained it through continuous monitoring.
• Prior ISSM or ISSO experience on a DoD or IC contract.
• 8+ years in cybersecurity, information assurance, or security engineering, with a substantial portion directly supporting DoD or IC systems.
• Track record of delivering security work reliably and under scrutiny.
• Experience with security architecture across identity, authorization, cryptography, and audit.
• Experience designing security boundaries between systems.
• Experience running security operations and leading incident response in complex environments.
• Experience as the primary security interface to government customers, assessors, and internal engineering leadership.
• A current DoD 8140 / 8570 IAM-qualifying certification is required at hire.
• Must be able to maintain certification currency throughout the role.

Nice To Haves

• Experience as a Prime contractor is strongly preferred.
• Experience with FedRAMP inheritance modeling and CSP shared-responsibility mapping is a plus.
• Familiarity with how AI agents interact with data and tools, and securing those interactions.
• Familiarity with Palantir Foundry, O365/SharePoint, or Databricks in classified or IL5 environments is a bonus.
• CISSP or CISM (IAM Level III) strongly preferred.
• CASP+ accepted.
• Prior experience standing up a security program at a startup or small company.

Responsibilities

• Own the security program for Adelphi.
• Drive Adelphi’s work through Dept of War authorization on the IL2 (NIPR) path and onto a defensible IL5 trajectory, operating on a continuous-ATO cadence.
• Manage security architecture, compliance program, and day-to-day security operations.
• Serve as the primary interface to the Dept of War Authorizing Official, assessors, and customer program office.
• Work closely with a small, high-velocity engineering team.
• Lead at least one DoD or IC system through the NIST RMF authorization process to an ATO and sustain it through continuous monitoring.
• Run security operations and lead incident response in complex environments.
• Write clear, structured findings for both technical and executive audiences.
• Manage government customers, assessors, and internal engineering leadership.

Benefits

• Healthcare coverage: 100% employee premium and 50% dependents premium coverage of a platinum-level plan.
• 401K with 2% company match.
• $500 monthly Physical and Mental Health reimbursement program.
• Unlimited time-off policy.
• Competitive salary and equity compensation.
• Opportunity to work on impactful projects in the national security sector.
• Career growth and leadership opportunities in a dynamic, innovative environment.

What This Job Offers

• Job Type: Full-time
• Career Level: Senior
• Education Level: No Education Listed