Qureos Mentor

Cornerstone Defense

<div><h3 class="jobSectionHeader">Senior Information Systems Security Engineer 
TS/SCI with polygraph 
Reston, VA</h3>
 
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&rsquo;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&rsquo;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 &amp; Legal Services * 
We are seeking a highly skilled, hands-on Senior Information Systems Security Engineer (ISSE) to secure mission-critical systems across hybrid, cloud, and air-gapped environments. The ideal candidate brings deep technical expertise in RMF, STIG compliance, vulnerability scanning, continuous monitoring, and secure system engineering&mdash;someone who is actively involved in building and configuring secure solutions rather than simply reviewing them. In this role, you will design, engineer, assess, and sustain security controls across complex system architectures, ensuring compliance, operational readiness, and mission resilience. 
<h3 class="jobSectionHeader"> 
What you&rsquo;ll do:</h3>
<ul><li>Engineer, implement, and manage security solutions (firewalls, IDS/IPS, endpoint protection, encryption)</li><li>Perform security assessments across systems, applications, and networks</li><li>Implement, validate, and maintain RMF NIST 800-53 controls across on-prem, cloud, and air-gapped systems</li><li>Conduct STIG checks, hardening, and secure configuration updates for OS, applications, network devices, and cloud resources</li><li>Run ACAS/Tenable scans, analyze vulnerabilities, and drive remediation with engineering teams</li><li>Configure log ingestion, parsing, and data flows into SIEM platforms (Splunk), and build dashboards and alerts</li><li>Monitor network traffic, logs, and events to detect anomalies and security threats</li><li>Conduct incident investigations and provide technical recommendations for mitigation</li><li>Maintain and enhance incident response plans and continuous monitoring procedures</li><li>Engineer, configure, and modify secure system and network baselines</li><li>Analyze and troubleshoot network protocols, packet flows, and configuration issues</li><li>Produce RMF artifacts, POA&amp;Ms, scan reports, dashboards, and security documentation</li><li>Collaborate with DevSecOps, system engineering, IT, and development teams to embed security into the lifecycle</li><li>Write user stories, define security acceptance criteria, and support regression testing</li><li>Perform system assessments and security engineering within air-gapped and restricted networks</li><li>Support ongoing continuous monitoring activities and security control reviews</li></ul>
<h3 class="jobSectionHeader">What you&rsquo;ll need</h3>
<ul><li>7+ years cybersecurity/ISSE experience designing, implementing, and assessing security controls</li><li>Strong experience with RMF, NIST 800-53, STIGs, ICD 503, FISMA, FedRAMP</li><li>SIEM experience, including log configuration, dashboards, and analytics (Splunk preferred)</li><li>Hands-on ACAS/Tenable vulnerability scanning and analysis</li><li>Cloud security experience (AWS/Azure/GovCloud) in IL5&ndash;IL6 environments</li><li>Strong understanding of network protocols, OS internals, and infrastructure security</li><li>Skilled in incident response and forensic analysis</li><li>Experience with tools such as Fortify, Acunetix, and Prisma Cloud</li><li>Experience configuring/modifying secure system and network baselines</li><li>Familiarity with agile workflows, user stories, and regression testing</li><li>Experience working in air-gapped or disconnected environments</li><li>Strong communication skills for both technical and non-technical audiences</li><li>CISSP or DoD 8140-approved certification</li><li>Active TS/SCI with CI poly</li></ul></div>

Senior Information Systems Security Engineer

Title: Senior ServiceNow Scrum Master 
Location: Bethesda, MD 
Compensation Range: $215k approximately 
*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&rsquo;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&rsquo;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 &amp; Legal Services * 
 
Seeking a highly experienced Senior ServiceNow Scrum Master to support the IC customer. In this role, the candidate will deliver agile project facilitation and process leadership for efforts utilizing the ServiceNow (SNOW) platform. The selected Scrum Master will coordinate with senior IC leadership, other contractors, and cross-functional teams to ensure the delivery of high-quality solutions aligned with the customer&rsquo;s mission objectives. 
 
This position requires a professional with strong interpersonal skills, the ability to develop relationships with very senior leadership, and the skill to navigate and collaborate across contracting teams and enterprise stakeholders. 
 
As a Senior SNOW Scrum Master, you will play a critical role in enabling and enhancing IC mission capabilities by blending agile principles, SNOW expertise, and leadership to deliver impactful, scalable solutions. Join a dynamic, high-performing environment where your contributions will make a tangible and lasting impact. 
 
Primary Responsibilities: 
 
Scrum Facilitation &amp; Agile Leadership: 
 
Act as the Scrum Master for projects using the SNOW platform, enabling agile processes and ensuring adherence to Scrum principles, roles, and best practices. 
 
Serve as a key facilitator for Scrum ceremonies, including sprint planning, daily stand-ups, sprint reviews, retrospectives, and backlog refinement sessions. 
 
Optimize team performance, measuring velocity and managing team capacity to deliver defined goals and milestones efficiently. 
 
Collaboration with Leadership &amp; Stakeholders: 
 
Work closely with senior IC leadership to ensure project alignment with organizational mission priorities and strategic objectives. 
 
Collaborate across contracting teams and project stakeholders to facilitate communication, resolve conflicts, and ensure cooperation between teams supporting other contracts. 
 
Project &amp; Risk Management: 
 
Ensure projects meet scope, schedule, and performance objectives by managing risks, identifying potential blockers, and recommending mitigation strategies. 
 
Maintain consistent communication with senior leadership, providing regular updates, project status reports, and metrics to track progress and identify areas for improvement. 
 
SNOW Expertise: 
 
Guide teams in implementing and expanding ServiceNow functionalities, ensuring the platform supports mission priorities effectively. 
 
Coordinate updates, enhancements, and new capabilities in the SNOW environment by synchronizing with technical teams and ODNI leadership. 
 
Mentorship and Team Empowerment: 
 
Act as a mentor and servant leader, fostering a culture of accountability, transparency, and collaboration among team members. 
 
Provide coaching on agile principles and practices to team members, ensuring alignment and consistency across workstreams. 
 
Collaboration: 
 
This role involves daily interaction with senior leadership and integrated contractor teams, requiring strong stakeholder management and communication skills. 
 
Qualifications 
Basic Qualifications: 
 
TS/SCI with Polygraph is REQUIRED. 
Minimum of 13 years of relevant professional experience, with at least 5 years operating as a Scrum Master in an agile development environment. 
Bachelor&rsquo;s degree in a related field (e.g., Information Technology, Engineering, Business) or equivalent experience. 
Agile &amp; Scrum Skills: 
 
Proven expertise in agile coaching, servant leadership, and Scrum Master roles within complex, dynamic environments. 
Ability to manage SNOW VTB boards (or equivalent tools) for tracking sprint progress, managing team workloads, and reporting metrics. 
Interpersonal &amp; Leadership Skills: 
 
Demonstrated ability to interface effectively with senior leadership, including IC executives, by presenting concise updates and facilitating strategic discussions. 
Exceptional communication skills to collaborate across multi-contractor and cross-functional teams, resolving conflicts and aligning stakeholders. 
A proactive mindset with the ability to anticipate challenges, communicate risks, and align team efforts with mission goals. 
Preferred Qualifications: 
 
Agile certifications such as Certified Scrum Master (CSM), Advanced Certified Scrum Master (A-CSM), or SAFe Scrum Master (SSM). 
Familiarity with Intelligence Community (IC) environments, directives, and mission workflows. 
Experience working in a consultative role across multiple contractor teams and understanding diverse enterprise priorities.

Senior ServiceNow Scrum Master

Join Cornerstone Defense and explore 2   exciting career opportunities. They're hiring for various roles with options for remote or on-site work. Apply today and become part of their innovative team.

Cornerstone Defense

About Company

Senior Information Systems Security Engineer

Senior ServiceNow Scrum Master