Information System Security Engineer (ISSE)

SIXGEN’s mission is to deliver agile, mission-ready cybersecurity solutions that empower government and critical infrastructure organizations to stay ahead of advanced cyber threats. We combine innovation, deep expertise, and cutting-edge capabilities to uncover vulnerabilities, protect vital systems, and ensure operational superiority in an ever-evolving digital landscape.

Position: ISSE

Job Type: Full Time

Location: Annapolis Junction or Fort Meade, MD

Clearance Requirements: TS/SCI with Full Scope Poly

Travel: Up to 10%

ABOUT THE TEAM

SIXGEN supports missions by serving government and commercial organizations as they overcome global cybersecurity challenges. In this position, you’ll provide meaningful support to our customer’s missions and operations. You’ll work alongside a team of highly skilled operators who are dedicated to using innovative processes, tools, and techniques to get things done. 

WHAT YOU’LL DO

• Design, implement, and validate security controls and architectures to ensure compliance with applicable cybersecurity frameworks (e.g., NIST 800-53, RMF).
• Conduct system security engineering activities including risk assessments, threat modeling, and vulnerability analysis.
• Integrate security requirements into system designs and support secure configurations, hardening, and mitigation strategies across hardware and software.
• Collaborate with ISSOs, system administrators, and development teams to ensure effective security integration throughout the system lifecycle.
  Provide technical expertise and support during security assessments, system audits, and the Authorization to Operate (ATO) process.

REQUIRED QUALIFICATIONS

• US Citizen with the ability to obtain a TS/SCI w/ Full Scope Poly 
• Strong understanding of cybersecurity frameworks and standards, including NIST SP 800-53, Risk Management Framework (RMF), and System Security Engineering (SSE) principles.
• Experience designing, implementing, and validating security controls for complex systems across the full system development lifecycle.
• Proficiency in conducting threat modeling, risk assessments, and vulnerability analysis.
• Hands-on experience with system hardening, secure configuration, and integration of security tools and technologies.
• Ability to interpret and apply security requirements to system designs in collaboration with cross-functional teams.
• Familiarity with technologies such as firewalls, IDS/IPS, encryption, identity and access management (IAM), and network security architectures.
• Proficiency with tools commonly used in federal cybersecurity environments (e.g., eMASS, Xacta, or similar GRC platforms).

US Salary Range

$100,000 - $175,000 USD

The salary range for this role is an estimate based on a wide range of compensation factors, inclusive of base salary only. Actual salary offer may vary based on (but not limited to) work experience, education and/or training, critical skills, and/or business considerations. The final salary offer will be determined after a thorough review of the candidate's background and alignment with the role. Additionally, SIXGEN offers top-tier benefits for full-time employees, including:

• Employer-paid health insurance premiums (medical, dental, vision) for you and your family 
• Employer-paid short/long term disability insurance and basic life/AD&D insurance
• 401K with a 4% employer contribution
• Professional development reimbursement options available (training, certification, education, etc)​
• Flexible and remote work policies for most positions
• Flexible PTO and holiday schedule

SIXGEN is an Equal Opportunity Employer. We ensure that all applicants are considered for employment without regard to race, color, religion, sexual orientation, gender identity, national origin, disability, age, marital status, ancestry, projected veteran status, or any other protected group or class.

We are committed to fostering an inclusive culture that values diversity in our people, reflecting the communities we serve and our customer base. We strive to attract and retain a diverse talent pool and create an environment where everyone is empowered to be their authentic selves at work.