• Location: Reston, Virginia
• Type: Contract
• Job #3785

Information Systems Security Engineer
Reston VA 
*Clearance: *Active TS/SCI w/ Polygraph needed to apply *
Company Overview:
Cornerstone Defense is the Employer of Choice within the Intelligence, Defense, and Space communities of the U.S. Government.  Realizing early on that our most prized assets are our employees, we continually focus our attention on improving the overall work/life experience they have supporting the mission.  Our Team is pushed every day to use their industry leading knowledge to provide end-to-end solutions to combat our nation’s toughest and most secure problems.  If you are looking for a place to not only be professionally challenged, but encouraged and supported by a company that cares, don’t look any further than Cornerstone Defense.

Benefits Overview:
Cornerstone Defense offers a very comprehensive benefits package including, but not limited to: Medical, Dental and Vision Plans * Generous PTO Policy * 401(k) * HSA and FSA options * Life and Disability Insurance * Tuition Reimbursement and Training * Perks at Work Discount Program * Referral Program * Leads Generation Program * CollegeAmerica 529 * Fitness Reimbursement Program * Travel Assistance * Norton Lifelock Benefit Solutions * Life Planning Financial & Legal Services *

Overview:
We are seeking a highly skilled Information Systems Security Engineer (ISSE) to join our team. In this role, you will design, implement, and maintain enterprise security solutions to protect mission-critical systems, networks, and data. You will collaborate with cross-functional teams to ensure compliance with government security standards while proactively addressing vulnerabilities and threats.

Company Benefits:
Cornerstone Defense offers a comprehensive list of benefits, designed to give employees and their families several options to choose from when selecting benefits that best fit their needs.  These offerings include not only a full suite of the traditional Medical/Dental/Vision insurances, but also a number of other benefits and perks to include, but not limited to:  A 401(K) plan with a company match, tuition and training assistances, paid vacation/leave, a fitness reimbursement program, college savings plan, commuter benefits, financial advisory services, flex spending accounts, health savings accounts, STD/LTD coverage, life and AD&D insurance, employee assistance programs, life financial planning assistance, and legal resources.
Key Responsibilities

• Design, deploy, and manage security solutions including firewalls, IDS/IPS, endpoint protection, and encryption mechanisms.
• Conduct regular security assessments to identify and remediate weaknesses in systems, networks, and applications.
• Develop and implement incident response plans; investigate anomalies and breaches, and take swift action to mitigate risks.
• Collaborate with IT, development, and compliance teams to establish security policies, procedures, and best practices aligned with frameworks such as NIST SP 800-53, RMF, ICD 503, FISMA, and FedRAMP.
• Monitor network traffic, system logs, and alerts to detect potential threats; utilize tools like Splunk for log aggregation and analysis.
• Integrate security controls into all phases of system and software development, including cloud, containerized, and DevSecOps environments (IL5–IL6+).
• Maintain detailed documentation of security configurations, processes, and incident reports.

Required Qualifications

• Education: Bachelor’s degree in Computer Science, Information Security, or related field
• Experience: 7+ years in cybersecurity engineering, including:
• Designing and implementing security controls
• Continuous monitoring and compliance auditing
• Cloud and DevSecOps security (IL5–IL6+)
• Log management and analysis (Splunk)

• Technical Skills:
• Government security frameworks (NIST SP 800-53, RMF, ICD 503, FISMA, FedRAMP)
• Incident response, forensic analysis, and security incident handling
• Familiarity with tools such as Fortify, Acunetix, and Prisma Cloud
• Certifications: CISSP or equivalent (DoD 8140 compliant)