Security Engineer & Operations - Senior

Aretum is a mission-driven organization committed to delivering innovative, technology-enabled solutions to our customers across defense, civilian, and homeland security sectors. The Senior-Level Security Engineer & Operations professional provides advanced cybersecurity and security engineering support, technical leadership, and incident response for Department of War mission systems in classified environments.

Responsibilities:

• Support planning, assessment, and implementation of Zero Trust principles across classified environments
• Evaluate identity, device, network, application, and data protection controls
• Assess Zero Trust maturity against DoD Zero Trust reference architectures
• Provide recommendations to reduce implicit trust and strengthen access control enforcement
• Oversee SIEM and SOAR operations for classified networks
• Analyze security logs, alerts, and correlated events to identify threats and anomalous behavior
• Perform traffic pattern analysis to detect lateral movement, unauthorized activity, and data exfiltration risks
• Support incident response investigations and forensic analysis
• Oversee vulnerability management and advanced vulnerability analysis efforts
• Assess mission risk across enterprise, tactical, and mission networks
• Ensure the security posture of complex, interconnected classified systems
• Configure and manage AWS Security toolsets (CloudTrail, GuardDuty, Inspector, Security Hub)
• Provide technical leadership and guidance to engineering, operations, and compliance teams
• Mentor junior and mid-level cybersecurity personnel
• Support cybersecurity strategy development and continuous process improvement
• Stay current with emerging threats, adversary TTPs, and evolving DoD cybersecurity guidance

Requirements:

• Master's Degree + 5 years of relevant experience or Bachelor's Degree + 8 years of relevant experience
• 8-12 years of experience in information assurance, cybersecurity, or security engineering
• IAT Level III Certification Must possess one of the following: CASP+ CE, CCNP Security+, CISA, CISSP, GCED, GCIH, or CCSP
• Active Top Secret Clearance Required
• Extensive experience supporting RMF in classified C5ISR and IIR environments
• Strong hands-on experience with ACAS, ESS, SIEM/SOAR, SCAP, DISA STIGs, and Burp Suite
• Demonstrated expertise in traffic pattern analysis and advanced vulnerability analysis
• Expert knowledge of NIST 800-series publications and DoD cybersecurity requirements
• Proven ability to lead complex cybersecurity and compliance efforts across multiple systems
• Demonstrated willingness to learn new tools/techniques and support cross-functional cybersecurity activities as mission needs evolve
• Extensive knowledge of AWS Security
• Experience supporting Department of War, DoD, or intelligence community mission systems
• Advanced certifications such as CISSP, CISM, CAP, or GSLC
• Experience implementing or assessing Zero Trust architectures
• Familiarity with cross-domain solutions and interconnected system authorization
• Hands-on experience with SIEM/SOAR tuning