Information Systems Security Engineer (Active TS/SCI Required)

missionovo; Chantilly, Herndon (VA, VA); On-site; USD 120,000 - 190,000; Full time

Benefits offered by this job

401(k) plan

Company-paid health care

Training and certifications stipend

Generous PTO

Professional development

Culture of collaboration

Job summary

Missionovo is seeking an Information Systems Security Engineer (ISSE) to design, implement, and sustain secure mission systems. You will work with engineers, security professionals, and stakeholders to ensure security requirements are met throughout the system lifecycle, from architecture through operations.

This role appeals to those who enjoy integrating security into system design, supporting authorization efforts, and strengthening resilience across enterprise and mission platforms.

Qualifications

• Minimum 5 years of experience in information assurance, cybersecurity engineering, or system security.
• Experience supporting security authorization in government or classified environments.
• Familiarity with RMF, risk management, and lifecycle security integration.
• Experience developing or maintaining security documentation and artifacts.
• Understanding of network, system, and application security principles.
• Strong analytical and collaborative communication skills.
• Ability to engage across technical teams and stakeholders.

Responsibilities

• Integrate security requirements into system architecture, design, and implementation.
• Assist with system authorization and accreditation across environments.
• Develop and maintain system security plans and supporting artifacts.
• Conduct security control assessments and remediation planning.
• Collaborate with engineering teams to apply secure configurations.
• Support vulnerability identification, tracking, and mitigation.
• Participate in risk assessments and recommend security controls.
• Coordinate with stakeholders to ensure policy and standards compliance.
• Contribute to continuous monitoring and ongoing posture improvement.

Skills

Security engineering

Analytical thinking

Communication

Collaboration

Threat modeling

Job description

Applicants must have an Active Top Secret Security Clearance with SCI Access (TS/SCI)

About the Role

We are seeking an Information Systems Security Engineer (ISSE) to support the design, implementation, and sustainment of secure mission systems. In this role, you will collaborate with engineers, security professionals, and key stakeholders to ensure systems meet security requirements throughout their lifecycle.

This position is ideal for someone who enjoys integrating security into system architecture, supporting authorization activities, and strengthening the resilience of enterprise and mission platforms.

Key Responsibilities

• Support the integration of security requirements into system architecture, design, and implementation activities
• Assist with system authorization and accreditation efforts across development and operational environments
• Develop and maintain security documentation, including system security plans and supporting artifacts
• Conduct security control assessments and support remediation planning activities
• Collaborate with engineering teams to implement secure configurations and best practices
• Support vulnerability identification, tracking, and mitigation activities
• Participate in risk assessments and recommend appropriate security controls
• Coordinate with stakeholders to maintain compliance with applicable security policies and standards
• Contribute to continuous monitoring and ongoing security posture improvement efforts

Required:

• Minimum 5 years of experience supporting information assurance, cybersecurity engineering, or system security efforts
• Experience supporting system security authorization processes within government or classified environments
• Familiarity with security frameworks, risk management practices, and lifecycle security integration
• Experience developing or maintaining security documentation and compliance artifacts
• Understanding of network, system, and application security principles
• Strong analytical, communication, and collaboration skills
• Ability to work effectively across technical teams and stakeholder organizations

Preferred:

• Experience supporting Intelligence Community or DoD mission environments
• Familiarity with Risk Management Framework (RMF) processes and security control implementation
• Experience supporting continuous monitoring or vulnerability management programsKnowledge of secure cloud or hybrid infrastructure environments
• Security certification such as Security+, CISSP, or equivalent
• Experience collaborating with system architects, developers, or platform engineers on secure system design

Clearance Required:

• TS/SCI w/ poly

About Missionovo

We are a mission-driven technology and engineering company dedicated to delivering innovative solutions that advance national security and achieve decisive outcomes. Trusted by the world’s most discerning customers, we are purpose-built to empower skilled professionals to excel in demanding environments.

What We Offer

At Missionovo, we believe in taking care of our people — personally and professionally.

• Leading compensation and 401(k) package
• Company-paid healthcare for you and any dependents
• Up to $5,250 per year for training, education, or certifications
• Generous Paid Time Off (PTO)
• Professional development and leadership opportunities
• A culture that celebrates curiosity, teamwork, and impact