Information System Security Engineer (ISSE)

ARS is seeking a highly qualified Information System Security Engineer (ISSE) with strong expertise in Cybersecurity, Cloud Security (Azure), and Systems Engineering. You will help design, secure, and sustain cutting-edge secure enclave environments at the tactical edge, supporting enterprise services and cyber defense operations across the DoD. The team will provide engineering expertise using technologies such as ePO, Splunk, ACAS, STIG/SCAP, Azure Automation, Defender for Cloud, Sentinel, and other enterprise cyber capabilities. The ISSE will perform technical security assessments, design security architectures, guide RMF documentation, and ensure secure operations in accordance with DoD and national cybersecurity requirements., * Engineer secure solutions supporting Cyber Threat and Defensive Operations for DoD enclave environments.

• Integrate, configure, and monitor Microsoft Defender for Cloud, Sentinel, Azure Policy, Azure Monitor, and Log Analytics.
• Automate threat assessment, security reporting, and continuous monitoring workflows.
• Develop and maintain Azure-based detections, dashboards, alerts, and automated response playbooks.
• Perform and document technical security assessments to identify vulnerabilities and recommend mitigation strategies.
• Implement and validate security controls and secure configurations in alignment with DoD, NIST, and organizational policies.
• Support all phases of the RMF lifecycle, including control selection, implementation, assessment, authorization, and continuous monitoring.
• Mitigate or correct security deficiencies identified during assessments, testing, or audits, and provide risk acceptance recommendations to the ISSM.
• Analyze, assess, and report system and organizational security posture trends to the ISSM/ISSO.
• Support audit preparation, artifact collection, and evidence validation for compliance activities.
• Ensure security operations, configuration changes, and maintenance activities are properly documented and kept current.
• Evaluate cybersecurity tools, compensating controls, and security technologies to ensure risk is reduced to acceptable levels, and report findings to the ISSM.
• Assist the ISSM/ISSO in developing and maintaining RMF documentation, including System Security Plans (SSPs), security diagrams, control evidence, and ATO package materials.
• Ensure security documentation and SSPs remain current and compliant with applicable DoD and program-specific policies.
• Support incident response investigations by analyzing security logs, alerts, and system activity.
• Other duties as assigned

• Must be a US citizen.
• Top Secret clearance with SCI eligibility.
• 5+ years related experience in SCI/SAP environments.
• Prior experience functioning as an ISSE or security engineer supporting RMF processes
• Advanced technical competency and experience in one or more of the following areas: Active Directory Domain Services, Active Directory Federated Services, Active Directory Certificate Services, Windows Server Update Services, ePO, Splunk, STIG/SCAP, YUM, ACAS Automation, and Azure Monitor / Log Analytics.
• Security+ certification
• Bachelor’s degree in Computer Science, Engineering, or related field OR equivalent experience
• 5-8 years of demonstrated performance in related technologies

Preferred Qualifications

• 5+ years leadership experience in relevant area of business.
• Technical certifications in Azure

All positions at Applied Research Solutions are subject to background investigations. Employment is contingent upon successful completion of a background investigation including criminal history and identity check.

Applied Research Solutions (ARS) is respected as a world-class provider of technically integrated solutions as we deliver premier talent and technology across our focused markets for unparalleled, continuous mission support.Awarded a Best Places to Work nominee since 2020, ARS recognizes that without our career- driven, loyal professionals, we would not be able to deliver state-of-the-art results for our mission partners. We firmly believe that prioritizing our employees is of the upmost importance. We provide a culture where our employees are challenged to meet their career goals and aspirations, while still obtaining a work/life balance. ARS employees are motivated through our industry competitive benefits package, our awards and recognition program, and personalized attention from ARS Senior Managers.