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Added 3 mins ago
VH
Engineering Technician
Veterans Health Administration
Charleston, SC
- $74,678 to $97,087 USD / year
The incumbent works under the general supervision of a Supervisory General Engineer.
Added 3 mins ago
Ford Racing Vehicle Engineering Lead, Feature & Software Delivery
Ford
Allen Park, MI · Allen Park
The Vehicle Engineering – Features & Human Factors Engineer will lead the integration of customer needs, human-centered design, HMI, selectable drive modes, ergonomics, and vehicle features…
Added 5 mins ago
CB
Information Security Engineer
Congressional Budget Office
Washington, DC
- $120,000 to $185,000 USD / year
…agency seeks a skilled and experienced Information Security Engineer to manage an effective program to protect its information…
Added 7 mins ago
DL
IT Specialist (ENTARCH)
Defense Logistics Agency
Philadelphia, PA · Battle Creek, MI · New Cumberland Defense Logistics Center, PA · Wright-Patterson AFB, OH · Whitehall, OH · Richmond, VA · Hill AFB, UT · Fort Belvoir, VA
- $125,776 to $187,093 USD / year
…Interconnects) and API integrations between on-premises legacy systems and GCP. | Develop and deploy physical enterprise data schemas and hybrid storage solutions to enhance mission…
Added 10 mins ago
OO
Cloud Solutions Engineer
Office of the Director of National Intelligence
McLean, VA
- $143,913 to $187,093 USD / year
Design, build, and maintain cloud infrastructure for IC OIG systems, including case management software and mission-critical applications hosted in cloud environments.
Added 17 mins ago
Data Analytics - Data Scientist
Cook Systems
San Antonio, TX
For over 30 years, Cook Systems has partnered with organizations across the country to solve technology challenges and build strong technology teams. As a veteran-owned IT consulting…
Added 20 mins ago
Instructor Learning Facilitator - Controls
Johnson Controls Inc.
United States
…Engineering or a related field plus one (1) year of experience as a Controls Engineer, IT Specialist or related occupation performing system checks, monitoring operations, and…
Added 21 mins ago
Kubernetes Engineer - Active TS/SCI with CI Poly
ENS Solutions, LLC
Reston, VA
Design, implement, and manage security controls for containerized workload solutions, including image scanning, firewalls, intrusion detection/prevention systems, endpoint protection,…
Added 30 mins ago
VH
Engineering Technician
Veterans Health Administration
Charleston, SC
- $74,678 to $97,087 USD / year
The incumbent works under the general supervision of a Supervisory General Engineer.
Added 30 mins ago
DH
Secure Network Operations - Technical
DHS Headquarters
Pensacola, FL · Springfield, VA · Arlington, VA · Idaho Falls, ID · Washington, DC · Chandler, AZ · Stennis Space Center, MS
- $106,700 to $214,500 USD / year
…of technical roles in Secure Network Operations, including Systems Administrator, Network Engineer, Distributed Systems Engineer, and Network Operations Specialist. All positions are in the…
Added 37 mins ago
Ford Racing Vehicle Engineering Lead, Feature & Software Delivery
Ford Global
Allen Park, MI
The Vehicle Engineering – Features & Human Factors Engineer will lead the integration of customer needs, human-centered design, HMI, selectable drive modes, ergonomics, and vehicle features…
Added 38 mins ago
Security Engineer (TOP SECRET Clearance Required)
i3
Chantilly, VA
We are seeking a Senior Security Engineer to secure enterprise applications, cloud environments, and critical infrastructure. This role involves advancing the organization's security…
Added 43 mins ago
Project Engineer
Enerstaff
Elmhurst, IL
Understanding of electrical systems, motors, sensors, PLCs, VFDs, and industrial controls.
Added 44 mins ago
Sr. Process Engineer - Drug Product
Encoded Therapeutics
Morrisville, NC
We are seeking an experienced Sr. Process Engineer to join our rapidly growing team based in RTP, NC. This role will focus on the design, implementation and lifecycle management of…
Added 44 mins ago
Cybersecurity Engineer
Visa U.S.A. Inc.
Austin, TX
The Cybersecurity Analyst – IAM supports the operation of identity and access management controls across the Pismo platform,
Added 50 mins ago
HSE by Design Engineer
Eli Lilly and Company
United States
…process design and operations, document findings, and recommend controls to minimize or eliminate risk. Ensure HSE design rationale is complete and that site teams understand their safety…
Added 58 mins ago
J
Senior Security Engineer, Infrastructure Security
Jobgether
Remote, United States
- $160,000 to $210,000 USD / year
We are seeking an experienced Infrastructure Security Engineer to strengthen and scale the security of a complex, cloud-native technology environment. In this role, you will protect…
Added 1 hour ago
Window IoT Core Embedded Engineer
Inabia Software & Consulting Inc.
Milwaukee, WI
This role is similar to Window IoT Core Embedded Engineer
Added 1 hour ago
Controls Engineer
Valknut Automation
Lake Orion, MI
If you are a skilled Controls Engineer who enjoys hands-on design, programming, and commissioning of advanced automation systems, this contract role offers challenging work and the…
Added 1 hour ago
J
Senior Engineer, Exposure & Vulnerability Management
Jobgether
Remote, United States
- $134,200 to $180,600 USD / year
The Senior Engineer, Exposure & Vulnerability Management will lead the evolution of enterprise security from periodic vulnerability scanning to continuous, risk-driven exposure management.…
Added 1 hour ago
Principal Engineer, Electrical
Blue Bird Brand
Fort Valley, GA
Reporting to the Senior Director of Electrical Engineering, the Principal Design Engineer, Electrical serves as a technical authority for vehicle electrical/electronic architecture,…
Added 1 hour ago
Electrical Engineer II, Advanced Product
Form Energy
Somerville, MA
We're hiring an Electrical Engineer II to design, build, troubleshoot, and test the control systems and test assets that support development of our next generation of iron-air batteries. As…
Added 2 hours ago
Staff Security Engineer
Jobgether
Remote, United States
As a Staff Security Engineer, you will define technical security direction, lead risk reduction initiatives, and work alongside engineering teams to build secure and scalable systems. Your…
Added 2 hours ago
J
Lead Data Engineer
Jobgether
Remote, United States
- $110,000 to $145,000 USD / year
This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Lead Data Engineer based in the United States.
Added 2 hours ago
Lead Software Engineer
JPMC page
Plano, TX
As a Lead Software Engineer at JPMorganChase within the Corporate Sector – Corporate Technology, you are an integral part of an agile team that works to enhance, build, and deliver trusted…

Castelion Corporation

Information System Security Engineer (ISSE)

Torrance, CA, United States
Torance, CA, United States

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Job details

Posting language: English
Posted: Nov 3, 2026

Original job description

Why Castelion, Why Now

Castelion is moving incredibly fast to develop and deliver advanced defense systems at a time when execution matters more than ever. We believe focus, ownership, and excellence are decisive advantages - and we're building a world-class team to turn bold ideas into real capability.

This is a rare opportunity to join at an early stage, where you'll have significant ownership, collaborate with exceptional teammates, and make a direct, measurable impact on our mission and the future of the company - regardless of your function.

Information System Security Engineer

The Information System Security Engineer (ISSE) at Castelion is responsible for translating security requirements into tested controls for classified information systems. In this role, you will harden systems and networks, configure security tools, investigate findings, and work with Information System Security Managers (ISSMs), Information System Security Officers (ISSOs), and IT engineers to support system authorization and continued operation. This position offers the opportunity to build practical security capabilities for disconnected engineering environments that support product development and testing.

Responsibilities

Harden Windows, Red Hat Enterprise Linux (RHEL), virtualization platforms, and network infrastructure. Apply Defense Information Systems Agency Security Technical Implementation Guides (DISA STIGs), implement approved access and network-segmentation controls, and test changes with IT engineers to preserve required services.
Configure and maintain security information and event management (SIEM), endpoint protection, and centralized logging. Integrate log sources, tune alerts, verify agent and data-collection health, and support investigation, containment, and recovery when security events occur.
Assess vulnerabilities and security configurations, prioritize findings with system owners, implement approved fixes, and verify results. Document remaining risks and maintain security tools, patches, and update content through approved offline processes.
Work with the ISSM and ISSO on Risk Management Framework (RMF) activities to obtain and maintain an Authorization to Operate (ATO). Provide configuration records, scan results, system diagrams, control-implementation evidence, and remediation updates for assessments and Plans of Action and Milestones (POA&Ms).
Review internally developed software, third-party packages, and container images with developers before introduction into classified systems. Support controlled testing and release, automate repeatable security checks, and maintain operating procedures and change records.

Basic Qualifications

Hands-on experience supporting classified information systems, including work within approved security boundaries and controlled change processes.
Experience securing Windows and Linux servers or workstations, including authentication, permissions, auditing, and services; working knowledge of Active Directory and Group Policy.
Experience hardening networks through segmentation, firewall or access-control rules, secure management interfaces, and restriction of unnecessary ports, protocols, and services.
Practical experience applying DISA STIGs, assessing configurations through automated and manual checks, documenting findings, and verifying corrective actions.
Experience configuring or maintaining a SIEM, including log collection, searches, alert tuning, and investigation.
Experience deploying or administering endpoint protection, including policy configuration, agent health, update management, approved exclusions, and troubleshooting.
Experience using vulnerability-assessment tools to identify findings, evaluate operational impact, and confirm remediation.
Experience supporting ISSM/ISSO authorization activities, security-control evidence, assessment preparation, and finding closure under the RMF.
Ability to troubleshoot security configurations, document work clearly, and explain technical risks and proposed fixes to security and IT teams.
Experience performing privileged administration on secure or classified systems, including administrative account management, access controls, audit logging, and documented configuration changes.
Must possess and maintain a current cybersecurity certification accepted for the position’s assigned DoD Cyber Workforce Framework (DCWF) work role and proficiency level, and meet applicable DoD 8140.03 and program qualification requirements.

Preferred Skills and Experience

Experience maintaining air-gapped systems, including approved media transfers, offline patches, security-content updates, and local software repositories.
Experience with Splunk or Elastic Security, including Linux rsyslog, Windows event forwarding, or similar log collection methods.
Experience with Trellix endpoint protection, ePolicy Orchestrator (ePO), or data loss prevention (DLP); Nessus/Tenable; or Security Content Automation Protocol (SCAP) assessment tools and STIG Viewer. Equivalent tool experience is relevant.
Experience securing VMware vSphere/ESXi or Microsoft Hyper-V, storage and backup services, and Juniper or comparable network infrastructure.
Experience with PowerShell, Bash, Python, or Ansible to automate configuration checks, evidence collection, or approved remediation.
Experience with eMASS or comparable authorization-documentation tools, initial system authorization, and applicable NIST security controls, Defense Counterintelligence and Security Agency (DCSA) requirements, or the Joint Special Access Program Implementation Guide (JSIG).
Experience reviewing software dependencies, container images, and software bills of materials (component inventories), using tools such as Trivy, Anchore, or equivalent. Familiarity with approved on-premises source-control and build/release workflows, such as GitHub Enterprise Server.

Additional Requirements

Ability to put in extended hours, including evenings and weekends, when required to meet aggressive timelines.
This role is based in Torrance, CA and requires full-time onsite presence.
Occasional travel is required.

Physical Demands

Ability to lift and move equipment weighing at least 40 pounds when supporting equipment installation or maintenance, with or without reasonable accommodation.

Other Duties

Please note this job description is not designed to cover or contain a comprehensive listing of activities, duties or responsibilities that are required of the employee for this job. Duties, responsibilities and activities may change at any time with or without notice.

Benefits and Perks

All full-time employees are granted meaningful long-term equity, sharing in the company’s significant growth trajectory. We offer four (4) weeks of paid time off, ten (10) company-paid holidays, and comprehensive health benefits - including 100% employee-covered medical and strong dependent coverage, along with dental and vision plans. We also provide paid parental leave to support growing families, a $100 monthly fitness stipend to promote health and performance, and onsite EV charging for convenience. In addition, employees enjoy perks like catered meals, company-covered food during high-demand periods, and a fully stocked kitchen to stay fueled throughout the day.

Security Clearance and Access

U.S. citizenship is required. Must possess and maintain an active Top Secret/Sensitive Compartmented Information (TS/SCI) security clearance and meet applicable program-access requirements. This position requires privileged access to classified systems. Required privileged-user training and system-specific authorizations must be completed before performing privileged duties. Castelion offers a generous benefits package. Please refer to the bottom of our Careers page for more details.

Other Duties

Additional Eligibility Requirements

This position may require access to classified information or restricted U.S. Government sites, systems, or information, as determined by the Company and/or applicable U.S. Government requirements. If the position is so designated, your employment in the role may be contingent upon your ability to obtain and maintain the required U.S. Government security clearance or other government authorization, and to satisfy any citizenship or other eligibility requirements imposed by applicable law, regulation, executive order, or government contract requirements. You will be notified if and when such requirements apply.

Affirmative Action/EEO Statement

Castelion is an Equal Opportunity Employer. We are committed to providing equal employment opportunities to all applicants and employees without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability, genetic information, protected veteran status, or any other characteristic protected by applicable federal, state, or local law.

Castelion is committed to providing reasonable accommodations to qualified individuals with disabilities throughout the application and hiring process. If you require a reasonable accommodation to complete an application, participate in the interview process, or otherwise participate in the hiring process, please contact hr@castelion.com. Requests for accommodation will be considered on an individual basis and handled in accordance with applicable law.

Castelion is committed to fostering a workplace where employment decisions are based on qualifications, business needs, and the ability to perform the essential functions of the role, with or without reasonable accommodation.

EAR/ITAR Requirements

This position requires access to export-controlled information, and as such, employment (or hiring of a contractor) is contingent upon the candidate’s ability to access all applicable export-controlled information without additional export licensing being required by the Bureau of Industry and Security and/or the Directorate of Defense Trade Controls.

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More about this job

Skills

Security regulations
Microsoft Windows
Red Hat Enterprise Linux
Event planning
Symantec Endpoint Protection
Risk management
Linux
Auditing
Microsoft Active Directory
Troubleshooting
Troubleshoot
Cybersecurity
Splunk
Loss prevention
Nessus
VMware
Microsoft PowerShell
Bash
Python
Ansible
eMASS
Documentation
GitHub

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