Cybersecurity Engineer II

Mirion is seeking an Engineer II, Cybersecurity Engineering to help deliver secure command-and-control systems for nuclear and other critical infrastructure environments. The role uses a Standard V-Model approach and spans requirements translation through cybersecurity architecture, integration and build, verification and validation, and onsite customer turn-up support. Work is based in Carrollton, TX with onsite duties and occasional travel.

What you’ll do

• Translate customer cybersecurity requirements into traceable, component-level specifications using the Standard V-Model, working with Project Engineering Leads.
• Maintain requirements and traceability records for assigned scope, identifying gaps, conflicts, or ambiguities for resolution.
• Provide effort estimates for assigned tasks.
• Contribute to cybersecurity architecture for AIM SCS and COTS-based command-and-control solutions, including network segmentation, access control, encryption, and secure communications, using established designs and baselines traceable to NEI 08-09 and CIS benchmark controls.
• Develop and maintain design documentation for assigned scope, including network diagrams, configuration specifications, and cybersecurity control mapping matrices with traceability to system requirements.
• Stand up, configure, and deploy platform environments including 20–30 Windows servers and workstations, virtualized infrastructure, Linux-based security appliances, network switches, and firewalls within an Active Directory domain.
• Apply Group Policy-based security controls and hardening standards, following approved procedures and the related design documentation.
• Perform COTS integration tasks including system hardening, vulnerability analysis, patching, and documentation of results.
• Diagnose and resolve integration issues using an analytical approach, escalating complex or cross-discipline issues as needed and documenting resolution paths.
• Maintain configuration management records throughout the build, documenting changes and deviations to preserve a complete audit trail.
• Verify that assigned product feature sets meet functional and cybersecurity acceptance criteria prior to formal test completion.
• Support cybersecurity testing by developing or supporting test procedures mapped through a Requirements Traceability Matrix (RTM) to validate compliance with applicable requirements.
• Support Acceptance Testing by performing vulnerability assessments and security scans, documenting and tracking findings through disposition.
• Support onsite deployment at customer sites, including physical installation, network commissioning, Active Directory integration, and system configuration per site-specific cybersecurity commissioning procedures.
• Assist with Site Acceptance Testing (SAT) in coordination with customer security, IT/OT, and operations staff, and communicate technical status and test results to the project team.
• Support training facility personnel and prepare turnover packages.
• Capture lessons learned from system deliveries and recommend improvements to build, integration, and test procedures.
• Follow and help maintain team standards, playbooks, and technical library content to support consistent engineering processes.
• Build proficiency in nuclear regulatory and cybersecurity standards through on-the-job experience, training, and mentoring from senior team members.
• Other duties as required.

Minimum qualifications

• Bachelor’s degree in Cybersecurity, Systems Engineering, Computer Science, Electrical Engineering, Information Technology, or a related discipline.
• 2 to 4 years of hands-on experience in cybersecurity, systems, or network engineering.
• Working knowledge of Windows Server and Active Directory, virtualization, and networking fundamentals (switching, routing, and firewalls).
• Familiarity with system hardening, vulnerability scanning, and patch management.
• Clear verbal and written communication skills, including the ability to produce technical documentation and report status.
• Familiarity with systems engineering lifecycle practices such as the V-Model.
• U.S. citizenship or permanent resident status required; ability to obtain site access credentials at nuclear power plants and government facilities.

Technologies and standards

• Standard V-Model, V-Model
• Windows Server, Active Directory, Group Policy
• Linux, network switches, firewalls, virtualization
• Requirements Traceability Matrix (RTM)
• NEI 08-09, CIS benchmark controls
• AIM SCS, COTS
• IT/OT

Travel and physical requirements

• Travel: Up to 25%.
• Physical: Required to sit or stand, bend, type and reach while performing daily functions; daily work with office equipment and materials.

Preferred experience

• Experience in project-based work with requirements-driven deliverables.
• Experience with Linux-based appliances and virtualized clusters.
• Exposure to nuclear power, defense, or other NRC/DOE/DOD-regulated environments, including nuclear communications systems and terminology.
• Familiarity with NEI 08-09, NIST SP 800-82, NIST SP 800-53, IEC 62443, and NRC 10 CFR 73.54.
• Security+, GICSP, or equivalent certification (or progress toward one).

Job type: contract. Location: Carrollton, TX (onsite).