Top 21 Security systems engineer Jobs in Littleton Co

Senior Systems Engineer – Security Integration
Four Sea Group, Inc. —Aurora, CO
- $151,695 - $205,233 a year
- Full-time
- 6 years
- Senior level
- Electrical Engineering
- Disability insurance
- Dental insurance
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Sr Systems Security Engineer / Sr. Core Applications Administrator
Sierra Nevada Corporation —Lone Tree, CO
- $143,487.14 - $197,294.82 a year
- Full-time
- 5 years
- System design
- Analysis skills
- Health insurance
- Dental insurance
Information System Security Engineer (ISSE)
Cyber Defense Technologies —Englewood, CO
- $120,000 - $180,000 a year
- System design
- Research
- Mid-level
- Health insurance
- Dental insurance
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9d
Security Systems Drafter
Beacon Communications —Littleton, CO
- $65,000 - $85,000 a year
- Full-time
- Hybrid work
- Background check
- Construction site
- Mid-level
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Senior Security Engineer
Karbon —Denver, CO
- $131,000 - $169,000 a year
- Remote
- Azure
- System design
- AWS
- Paid parental leave
- Dental insurance
Quick Apply
Sr Systems Security Engineer
Sierra Nevada Corporation —Lone Tree, CO
- $143,487.14 - $197,294.82 a year
- Full-time
- Azure
- System design
- Office
- Health insurance
- Dental insurance
Big Data Systems Engineer
KBR —Denver, CO
- $142,400 - $200,000 a year
- Full-time
- Remote
- Computer Science
- Windows
- 3 years
- Work from home
System Security Engineer/ ISSO
Sierra Nevada Corporation —Lone Tree, CO
- $94,345.12 - $129,724.54 a year
- Full-time
- Research
- Mid-level
- Office
- Health insurance
- Dental insurance
Information Systems Security Engineer (ISSE)
Entarian —Denver, CO
- $140,000 - $176,000 a year
- Full-time
- Microsoft Excel
- Microsoft Outlook
- Computer Science
Principal Systems Security Engineer / Senior ISSM
Sierra Nevada Corporation —Lone Tree, CO
- $165,010.21 - $226,889.04 a year
- Full-time
- 11+ years
- Office
- Presentation skills
- Health insurance
- Dental insurance
(USA) Principal, Systems and Infrastructure Engineer, Information Security
Vizio —Denver, CO
- $121,000 - $242,000 a year
- Azure
- Computer Science
- High school
- Paid jury duty
- Disability insurance
Cyber Systems Security Engineer III
Lockheed Martin Corporation —Littleton, CO
- $101,000 - $178,135 a year
- Full-time
- Office
- Organizational skills
- In-person
- Paid jury duty
- Paid holidays
Sr Systems Security Engineer / Sr. Database & Storage Administrator
Sierra Nevada Corporation —Lone Tree, CO
- $143,487.14 - $197,294.82 a year
- Full-time
- Azure
- Computer Science
- System design
- Health insurance
- Dental insurance
AppSec Engineer
Karbon —Denver, CO
- $131,000 - $169,000 a year
- Remote
- Azure
- System design
- Mid-level
- Paid parental leave
- Dental insurance
Quick Apply
Principal Application Security Engineer – AI & Agentic Systems
CVS Health —Denver, CO
- $144,200 - $288,400 a year
- Full-time
- Azure
- System design
- HIPAA
- Health insurance
- Dental insurance
Cybersecurity Test Engineer / Pen Tester
Entarian —Denver, CO
- $125,000 - $155,000 a year
- Full-time
- Microsoft Excel
- Azure
- Microsoft Outlook
IT Engineer - Cloud & Identity
PTMA Financial Solutions —Denver, CO
- $115,000 - $125,000 a year
- Weekends as needed
- Hybrid work
- Office
- Travel
- US work authorization
Quick Apply
3d
Senior IT Security Engineer - Mission System Cybersecurity & Compliance
Lunar Outpost —Golden, CO
- $100,000 - $120,000 a year
- Full-time
- Computer Science
- Engineering
- AWS
- Paid holidays
- Health insurance
Quick Apply
Sr Principal Cyber Systems Engineer
Northrop Grumman —Aurora, CO
- $156,400 - $234,600 a year
- Overtime
- Master's degree
- Bachelor's degree
- Doctor of Philosophy
- Paid holidays
- Disability insurance
6d
Postdoctoral Researcher: Bulk Grid Monitoring and Dynamic Security Assessment
National Laboratory of the Rockies —Golden, CO
- $76,600 - $126,400 a year
- Full-time
- Computer Science
- Pass drug screening
- 3 years
- 403(b) matching
- AD&D insurance

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security systems engineer jobs near littleton co

Senior Systems Engineer – Security Integration

Four Sea Group, Inc.
Aurora, CO

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Job Details

Full-time
$151,695 - $205,233 a year

Benefits

Disability insurance
Dental insurance
Paid time off
Vision insurance
Employee stock ownership plan
Retirement plan

Qualifications

Systems integration
Computer hardware
Hardware support
System deployment
TS/SCI with Polygraph
Security technology solutions implementations

Full Job Description

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.

About the role

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.

What you'll do

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.

Required Qualifications

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.

Preferred Qualifications

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.
Experience supporting classified deployments and operational transition of secure technologies.
Experience with audit logging, system monitoring, or security event visibility within mission environments.
Experience supporting system hardening, configuration control, or implementation of security baselines.
Experience working closely with cyber, systems, infrastructure, and operations teams in secure customer environments.
Experience in defense, intelligence, or other highly secure mission-critical programs.

Salary: The salary range for this role is $151,695.00- $205,233.00 per year. The salary range provided is a good-faith estimate representative of all experience levels. Four Sea Group, Inc. considers several factors when extending an offer, including but not limited to, the role, function and associated responsibilities, a candidate’s work experience, location, education/training, key skills, and market conditions.

Application Deadline: This position is expected to remain open through July 31, 2026. The company may adjust this deadline based on business needs and will update the posting as appropriate.

Benefits: FSG is 100% ESOP-owned, which means our employees share directly in the company’s growth. We offer competitive compensation, a strong employer-funded retirement plan, generous PTO and flexible time-off options, comprehensive health, dental, vision, life, short-term disability, and long-term disability benefits, plus a generous medical stipend that gives employees more choice and flexibility. Our model is intentionally built to keep more value with employees through salary, retirement, benefits, and ownership. You will work alongside experienced engineers and technical leaders on meaningful defense, space, software, systems, and mission support work, with room to grow as a technical expert, mentor, program contributor, or future leader.

EEO Statement: Four Sea Group is an equal opportunity employer and considers qualified applicants for employment without regard to race, color, sex, sexual orientation, gender identity or expression, religion, national origin, marital or familial status, age, disability, veteran status, military service or application for military service.

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Refine Your Search

security systems engineer jobs in littleton co

Senior Systems Engineer – Security Integration

Sr Systems Security Engineer / Sr. Core Applications Administrator

Information System Security Engineer (ISSE)

Security Systems Drafter

Senior Security Engineer

Sr Systems Security Engineer

Big Data Systems Engineer

System Security Engineer/ ISSO

Information Systems Security Engineer (ISSE)

Principal Systems Security Engineer / Senior ISSM

(USA) Principal, Systems and Infrastructure Engineer, Information Security

Cyber Systems Security Engineer III

Sr Systems Security Engineer / Sr. Database & Storage Administrator

AppSec Engineer

Principal Application Security Engineer – AI & Agentic Systems

Cybersecurity Test Engineer / Pen Tester

IT Engineer - Cloud & Identity

Senior IT Security Engineer - Mission System Cybersecurity & Compliance

Sr Principal Cyber Systems Engineer

Postdoctoral Researcher: Bulk Grid Monitoring and Dynamic Security Assessment

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