Information System Security Engineer (Tier 3)

Intrinsic Resolution, LLC is seeking a senior Information System Security Engineer (ISSE) Tier 3 to support advanced cyber engineering activities for the U.S. Department of Energy (DOE) and the National Nuclear Security Administration (NNSA) in Washington, DC. The position combines engineering, assessments and consulting support for NNSA’s Defense Nuclear Nonproliferation mission, cybersecurity training, and the development of software and technology solutions for GMS missions.

Key Responsibilities

• Perform cyber engineering tasks using advanced tool sets in support of NNSA mission objectives.
• Generate solutions for complex problems through analysis and innovative methods, coordinating with subject matter experts and program managers across critical infrastructure, industrial control system (ICS) cybersecurity, and information security.
• Develop and deliver cybersecurity training to domestic and international partners.
• Support multi-disciplinary, multi-lab teams conducting facility assessments and providing consulting services to DOE/NNSA’s DNN.
• Develop software and technological solutions to support GMS missions.
• Collaborate with cybersecurity experts on a regular basis to share knowledge, make recommendations, and complete deliverables.
• Independently and collaboratively design technical solutions by analyzing sponsor requirements, implementing software, and conducting analyses to meet those requirements.
• Coordinate multiple parallel tasks and competing priorities across customers and stakeholders to meet delivery timelines.
• Assist architects and system developers in identifying and implementing information security functionality, supporting consistent application of agency security policy and enterprise solutions.
• Contribute to security planning, assessment, risk analysis, risk management, certification, and security awareness activities for system and networking operations.

Required Qualifications

• Active Top Secret clearance with a current investigation within the last 5 years (mandatory).
• On-site presence required at the Washington, DC facility; no remote or hybrid options.
• New hire start dates are strictly the 1st and 16th of each month.
• On-call support is required; surge support outside normal business hours (EST) will be coordinated in advance whenever possible.
• Normal shift is Monday to Friday, EST; start and end times may vary based on commute and seating availability in secure spaces.
• Minimum 5+ years of experience in cybersecurity engineering or a closely related technical discipline.
• Hands-on experience with Splunk, RSA, Tenable Nessus, and SELinux.
• Strong understanding of ports, protocols, and services.
• Working experience in Microsoft and Linux environments.
• Familiarity with Ansible, Tenable, GEMS, and SIMS/Sentris platforms.

Relevant Technologies

• Splunk, RSA, Tenable Nessus, SELinux
• Microsoft, Linux
• Ansible, Tenable, GEMS, SIMS/Sentris
• SentinelOne, Microsoft Endpoint Configuration Manager (MECM)

Education

A formal degree is not required. Relevant years of experience and demonstrated technical capability carry more weight than academic credentials. Industry certifications such as CISSP, CEH, Security+, or equivalent are a plus.

Benefits

• 401(k) matching
• Dental insurance
• Health insurance
• Paid time off
• Vision insurance

Preferred Qualifications

• Familiarity with SentinelOne endpoint detection and response (EDR).
• Familiarity with Intrusion Detection/Prevention Solutions (IDS/IPS).
• Familiarity with Microsoft Endpoint Configuration Manager (MECM).

Position Logistics and Compliance Notice

• Location: Washington, DC 20585 (in person).
• Salary: USD 165,000 - 173,000 per year.

IMPORTANT NOTICE — 10 CFR PART 709 & PRE-EMPLOYMENT SCREENING: Pre-employment drug testing and a background investigation may be required for eligibility and access authorization. This position is covered by the Counterintelligence Evaluation Program regulations at 10 CFR Part 709, which may include a counterintelligence-scope polygraph examination.

Application Questions

• Are you familiar with Ansible?
• Are you familiar with Tenable?
• Are you familiar with SIMS/Sentris platforms?