Information Systems Security Engineer (Active TS/SCI Required)

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 ket 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 programs
Knowledge 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