Sr Systems Security Engineer / Sr. Core Applications Administrator

Sierra Nevada Corporation; Englewood (CO); Hybrid; USD 143,487 - 197,294; Full time

Benefits offered by this job

401(k) with 150% match

Tuition reimbursement

Medical, dental, vision benefits

Annual incentive pay

Job summary

Sierra Nevada Corporation in Englewood, Colorado, is looking for a Senior Systems Security Engineer to lead the design and implementation of security infrastructure. The role involves managing complex security projects, providing strategic direction, and mentoring junior engineers.

The ideal candidate will have extensive experience in Linux/RHEL administration, application lifecycle management, and hold a Top Secret U.S. Security Clearance. Comprehensive benefits and a competitive salary are included.

Qualifications

• 8+ years of IT security experience (12+ years if no degree).
• Expert knowledge of cybersecurity principles.
• Must have hands-on experience administering multiple engineering applications.

Responsibilities

• Manage full application lifecycle for engineering and DevOps platform applications.
• Administer RHEL/Linux systems, ensuring security and compliance.
• Troubleshoot integration failures among applications.

Skills

Cybersecurity principles

Application administration in Linux/RHEL

GitLab administration

JFrog Artifactory administration

RHEL system administration

Integration troubleshooting

SSL/TLS knowledge

Education

Bachelor’s degree in Systems Security, Network Engineering, or IT

Tools

RHEL

GitLab

JFrog Artifactory

3DEXPERIENCE

Jama Connect

Job description

Senior Systems Security Engineer

Senior Systems Security Engineer will lead the design and implementation of our security infrastructure, manage complex security projects, provide strategic direction for security practices, and mentor junior engineers.

Responsibilities

• Application Administration – Backend & Frontend: manage the full application lifecycle for critical engineering and DevOps platform applications across RHEL/Linux environments; install, configure, patch, upgrade, retire; administer Java EE servers (Apache Tomcat, JBoss/WildFly) and web servers (Apache HTTPD, Nginx); configure SSL/TLS, reverse proxy, load balancer; develop configuration baselines; patch management; monitor application health.
• RHEL / Linux Systems Administration: administer RHEL/CentOS/Rocky Linux; install, harden, manage users and packages; configure system services, firewalls, SELinux, DISA STIG hardening; performance tuning; develop automation scripts; manage LDAP/AD integration and Kerberos.
• JFrog / Artifactory Administration: install/configure Artifactory; manage repositories, users, permissions; set artifact lifecycle policies; integrate with CI/CD, Xray; maintain HA, backup, restore; administer JFrog Distribution/Pipelines if applicable.
• GitLab / GitHub Administration: install/upgrade instances; manage runners, groups, projects; set policies, security hardening; backup & disaster recovery; support migration and consolidation.
• 3DEXPERIENCE (3DX) Platform Administration: server configuration, service management, database, user provisioning; manage backups, upgrades, hotfixes; roles, licenses, integration touchpoints; performance monitoring; ATO/RMF support.
• Cameo Systems Modeler Administration: configure server, client, TWC; manage licenses; integration with 3DX, Jama; upgrade & migration support; provide tier 2/3 support.
• Jama Connect / TWC Administration: server, database, user provisioning; upgrades, integrations with Cameo, Teamcenter, GitLab/Jira; support audits.
• Integration Troubleshooting & Interoperability: diagnose integration failures; maintain architecture docs; monitor API health; coordinate testing; maintain runbooks.
• Security, Compliance & Change Management: maintain DISA STIG hardening; manage SSL/TLS certificates; implement RBAC; perform change management; document configuration; support audits and vulnerability management.

Qualifications – Must Have

• Bachelor’s degree in Systems Security, Network Engineering, IT or related discipline. 8+ years of IT security experience (12+ years if no degree). Higher level degree may substitute for experience.
• Expert knowledge of cybersecurity principles, NIST, ISO 27001.
• 5+ years of application administration in Linux/RHEL, including installation, configuration, patching, performance tuning.
• Production experience admin GitLab and/or GitHub at enterprise scale.
• Production experience admin JFrog Artifactory.
• Hands‑on admin of at least two of: 3DEXPERIENCE, Cameo, Jama, Teamcenter.
• Proficient RHEL system administration (RPM/YUM/DNF, systemd, user/group management, bash scripting).
• Experience troubleshooting multi‑application integration failures (API, auth, sync, middleware).
• Knowledge of SSL/TLS, firewall, application security.
• Current/Active Top Secret U.S. Security Clearance required.

Qualifications – Prefer

• Certifications: RHCSA, RHCE, GitLab Certified Associate, JFrog Certified Professional or equivalent.
• Admin all four engineering apps (3DX, Cameo, Jama, Teamcenter) within a single program.
• Experience with classified or air‑gapped environments.
• DISA STIG application experience for Linux and application platforms.
• Container orchestration (Docker, Kubernetes, OpenShift) experience.
• JFrog Xray for SCA, vulnerability scanning.
• Knowledge of 3DX architecture (ENOVIA, CATIA, etc.).
• Scale administration of Cameo TWC.
• IAM integration: LDAP, AD, Kerberos, SAML/SSO.
• Automation scripting in Python or Ansible.

Essential Functions

• Primarily computer‑based work; on‑call rotation for incident response.
• Occasional lifting up to 25 lbs.
• Office or hybrid environment; occasional travel.

Benefits & Compensation

Estimated Starting Salary: $143,487.14 - $197,294.82 (annual).

Annual incentive pay based on performance; 401(k) with 150% match up to 6%; medical, dental, vision; life insurance; 3 weeks paid time off; tuition reimbursement; and more.

Equal Opportunity Employer

SNC is an Equal Opportunity Employer committed to an environment free of discrimination. Employment decisions are made based on merit without regard to race, color, age, religion, sex, national origin, disability, status as a protected veteran, or other characteristics protected by law.

Security Clearance

This position requires current/active Top Secret clearance with SCI eligibility. U.S. Citizenship is required.