Battelle delivers when others can't. We conduct research and development, manage national laboratories, design and manufacture products and deliver critical services for our clients-whether they are a multi-national corporation, a small start-up or a government agency. We recognize and appreciate the value and contributions of individuals from a wide range of backgrounds and experiences and welcome all qualified individuals to apply. **Job Summary** Battelle's Cyber Business Line is seeking a **mid-level Linux Infrastructure Administrator** to help operate and grow an airgapped, multi-site research network supporting 70+ scientists and engineers. This role spans the full infrastructure stack-virtualization, identity, storage, networking, automation, and observability-within a petabyte-scale environment working toward CMMC Level 2 compliance. As a Linux Infrastructure Administrator, you will work within a small, agile infrastructure team with broad ownership of the systems researchers depend on every day. This includes supporting enterprise virtualization, storage, networking, security hardening, automation, and GPU-enabled environments for offline AI/ML workloads. You will have the opportunity to design, automate, and improve infrastructure in a highly mission-focused, closed-network environment. Location / Work Arrangement + Location: Columbus, Ohio + Employment Type: Full-time + Work Arrangement: Primarily on-site in a closed-network research environment + Schedule: Flexible, compressed work schedule with every other Friday off **Responsibilities** + Administer Linux domain services including identity, authentication, DNS/NTP, and certificate services across an airgapped, multi-site environment. + Build, deploy, and maintain virtual machines and services on enterprise virtualization platforms such as VMware, Proxmox, Nutanix, or similar technologies. + Develop and maintain Ansible playbooks and provisioning workflows for repeatable, automated system configuration. + Administer enterprise storage infrastructure including NAS platforms, network file shares, and object storage. + Support network operations including VLAN segmentation, enterprise firewall rule management, site-to-site VPN, and remote-access VPN. + Deploy and operate containerized services and support migration of core services to a container orchestration platform. + Implement and maintain security hardening, patching, file integrity monitoring, and audit logging in a disconnected environment. + Support compliance activities aligned to CMMC Level 2 / NIST SP 800-171, including evidence collection and configuration baselines. + Collaborate closely with researchers and technical staff to improve reliability, automation, and usability of shared infrastructure. **Key Qualifications** + Experience with Linux systems administration in an enterprise or research environment. + Experience with Linux domain administration, identity or directory services, centralized authentication, and host lifecycle management. + Knowledge of networking fundamentals including TCP/IP, VLANs, firewalls, VPNs, and multi-site architectures. + Experience with configuration management and automation tools such as Ansible, Puppet, Chef, or Salt. + Experience with containerization and container orchestration technologies. + Storage administration experience including RAID, volume management, network file shares, backup, and recovery. + Strong Python and Bash scripting fundamentals. + Virtualization experience with enterprise hypervisors such as VMware, Hyper-V, KVM-based platforms, or similar technologies. + U.S. citizenship required. + Ability to obtain and maintain a DoD Secret clearance. **Preferred Qualifications** + Experience administering airgapped, disconnected, or classified networks, including offline mirrors, removable-media transfer, and manual patch workflows. + STIG, CIS benchmark, or other compliance baselining experience; familiarity with NIST SP 800-171 / CMMC. + Identity and access management experience including directory services, LDAP/Kerberos, SSO/OIDC, PKI, and hardware-token deployment. + Distributed NAS administration experience. + Database administration experience in relational and/or search and analytics platforms. + Monitoring and SIEM experience including metrics and dashboarding, log aggregation, and host-based intrusion detection. + Experience with CI/CD and artifact management including pipelines, container registries, and offline package mirrors. + Experience with bare-metal and golden-image provisioning tooling. + Experience supporting GPU compute clusters or self-hosted AI/ML inference workloads. + Experience establishing, writing, and enforcing infrastructure policy. + Ability to work independently with minimal oversight. + Relevant certifications such as RHCSA, CompTIA Linux+, or Security+ (DoD 8570 IAT Level II). Some of the Extras That Make Working Here Great + Flexible, compressed work sch