Senior IT Security Engineer, Space: Classified Infra Lead

Mosaic.tech; Costa Mesa (CA); On-site; USD 166,000 - 220,000; Full time

Job summary

Anduril Industries is seeking a Senior IT Security Engineer to architect and build a new classified infrastructure for its Space team. You will define architecture, tooling, and automation from day one, ensuring resilience and compliance for mission-ready environments.

You will implement STIG controls across Windows and Linux, deploy virtualization, AD, DNS, DHCP, and patch management, and lead vulnerability remediation with ISSO/ISSM partners.

Qualifications

• 7+ years administering Windows Server and Linux (RHEL) in classified or regulated environments.
• Experience building infrastructure from scratch.
• Deep knowledge of STIG application and validation using SCAP/SCC.
• Strong VMware vSphere experience, including architecture decisions, provisioning, and patching.
• Experience standing up and managing Active Directory, DNS, DHCP, and enterprise patch management.
• Advanced scripting and automation skills (PowerShell, Bash, or Python) with hands-on Ansible.
• Eligible to obtain and maintain an active U.S. Secret security clearance.

Responsibilities

• Design and build classified infrastructure from scratch, including server environments, virtual platforms, networking, and enterprise services.
• Define and implement STIG compliance strategies across Windows, RHEL, and VMware, using SCAP, SCC, and manual validation; stand up repeatable processes for ongoing compliance scanning and remediation.
• Architect and deploy virtual infrastructure (VMware vSphere, and potentially vSAN and Horizon/VDI), making foundational decisions on topology, resource allocation, and scalability.
• Build out enterprise services from the ground up, including Active Directory, DNS, DHCP, WSUS/patch repositories, and repository servers.
• Develop automation frameworks using Ansible, scripting (PowerShell, Bash, Python), and infrastructure-as-code practices to ensure environments are reproducible, consistent, and minimally dependent on manual intervention.
• Establish monitoring, alerting, and incident response processes for system health, performance, and security posture.
• Lead vulnerability remediation efforts, driving technical implementation for CAT I/II/III findings and partnering with ISSO/ISSM stakeholders to meet required timelines.
• Design and implement backup and disaster recovery strategies, defining RPO/RTO targets and validating them through regular testing.
• Guide environments through the ATO process, producing documentation, compliance evidence, and technical demonstrations for security assessments.
• Create comprehensive runbooks, architecture documentation, and knowledge transfer materials to enable the team to scale beyond a single point of ownership.

Skills

Windows Server

Linux (RHEL)

STIG/SCAP

VMware vSphere

PowerShell

Bash

Python

Active Directory

DNS/DHCP

US Secret clearance eligible

Tools

Ansible

Job description

Anduril Industries is seeking a Senior IT Security Engineer to architect and build a new classified infrastructure for its Space team. You will define architecture, tooling, and automation from day one, ensuring resilience and compliance for mission-ready environments.

You will implement STIG controls across Windows and Linux, deploy virtualization, AD, DNS, DHCP, and patch management, and lead vulnerability remediation with ISSO/ISSM partners.