Senior Systems Engineer – Security Integration

Senior Systems Engineer – Security Integration About Four Sea Group, Inc.

Four Sea Group is a 100% employee-owned technical mission support company based in Denver, Colorado. Founded by an aerospace industry veteran and PhD astrophysicist, we support complex defense, space, software, systems, and mission-focused programs for government and industry partners. What sets FSG apart is the caliber of our people and the way we operate: we are a reputation-driven team of highly skilled engineers and technical experts who are brought in for their depth, judgment, and ability to solve difficult problems.

As an employee-owned company, we have built our compensation, benefits, and culture around a simple idea: when the company succeeds, that value should go back to the people doing the work.

We are seeking a Senior Systems Engineer – Security Integration to support a secure program through implementation, integration, deployment, and sustainment of security-focused system capabilities. This role is best suited for a strong systems engineer with an IA background who can work independently within a defined scope, support mission-critical deployments, and help maintain system security posture across a secure customer environment.

The ideal candidate brings hands‑on experience with privileged‑user implementation, security-focused system integration, and deployment of infrastructure or hardware‑related security solutions, along with the ability to coordinate effectively across engineering and program teams.

• Support implementation, integration, deployment, and sustainment of security-focused system capabilities within a secure program environment.
• Configure and support systems, devices, and infrastructure components related to information assurance and mission security needs.
• Assist with deployment and integration of hardware- and security-related technologies across program environments.
• Support system security posture through disciplined implementation of approved configurations, controls, and technical solutions.
• Work with engineering, cyber, operations, and program stakeholders to support successful execution and deployment activities.
• Troubleshoot and resolve system, integration, and implementation issues affecting security-focused environments.
• Support use and implementation of privileged‑user functions in accordance with program and customer requirements.
• Participate in technical reviews, deployment planning, and readiness activities prior to implementation.
• Document technical configurations, deployment changes, issues, and system impacts clearly and accurately.
• Escalate risks, blockers, and technical concerns appropriately and in a timely manner.

• Bachelor’s degree in Systems Engineering, Electrical Engineering, Computer Engineering, Information Systems, Cybersecurity, or another relevant technical field, or equivalent practical experience.
• 6+ years of relevant systems, integration, security engineering, or information assurance experience in secure technical environments.
• Active TS/SCI clearance with Full Scope Polygraph required at time of application.
• Experience supporting information assurance or security-focused system implementation in classified or mission-driven environments.
• Experience with privileged-user implementation, system integration, and deployment activities.
• Experience with security-related hardware or infrastructure components in operational environments.
• Experience with technologies such as firewalls, guards, audit or logging-related controls, filtering technologies, or similar security infrastructure.
• Experience troubleshooting and resolving integration or deployment issues in secure environments.
• Ability to work independently within assigned scope and coordinate effectively across engineering and program stakeholders.
• Strong written and verbal communication skills.

• Experience with cross-domain technologies, secure data transfer controls, filtering/scrubbing technologies, or guard-related implementations.
• Experience with hardware security integration, device-level deployment, or secure infrastructure rollout activities.
• Experie…