Senior Network Administrator

Xcimer Energy leverages decades of research on Inertial Fusion Energy (IFE) combined with groundbreaking new laser architecture. Our mission is to deploy fusion power plants to meet global decarbonization goals as fast as possible. Xcimer has assembled a team of leaders in tough tech, fusion science, and manufacturing with a track record of rapid execution. Supported by leading investors, Xcimer is uniquely positioned to deliver limitless, clean, fusion power to combat climate change.

Join us in powering a better world with inertial fusion!

As a Senior Network Administrator
, you will apply your skills in order to architect and govern our growing infrastructure and play a critical role in the development of our digital ecosystem. We are looking for administrators to apply their technical expertise, problem solving skills, and dedication to quality in order to radically impact the future of energy!

We are looking for an experienced professional who is passionate about:

Designing elegant, scalable network architecture, building resilient and secure connectivity between complex digital systems, and maintaining best practices for regulated environments while ensuring operational efficiency.

Responsibilities

• Own and deliver on the following:

Meraki Cloud and Cisco ISE Ownership and Configuration

• Develop, configure, test and deploy scalable Cisco architecture for an ever-growing network of hubs spanning the US and increase the resiliency and redundancy of critical network infrastructure.
• Architect and implement secure office networks in a regulated environment.
• Design and deploy policies for device authentication on office networks, VPN for remote workers, and site‑to‑site connections, including but not limited to device‑based network level authentication, secure certificate distribution, remote access, site‑to‑site VPN, wake‑on‑LAN, VPN connectivity, and secure VoIP.
• Provide strategic insight and ownership of continued network expansion involving both large data and operations hubs as well as satellite offices and installations.
• Assist IT staff with external service integrations involving SSO and endpoint management.

Air‑gapped (IoT) Network Architecture and Server Management

• Collaborate with controls and engineering teams to develop efficient and secure infrastructure for interconnected offline systems and on‑premises server stacks.
• Implement and maintain methodologies for high‑density data transactions and exports.
• Establish access protocols for external maintenance of air‑gapped hardware.

Ensure Network Security for Regulatory Compliance

• Implement required controls and security policies in keeping with nuclear‑related government compliance standards (NIST, ITAR, etc.).
• Administrate and enforce access control policies involving environments aligned to FedRAMP High controls.
• Maintain and support audit efforts as it relates to network log retention, alerting and monitoring.

User Support and Documentation

• Provide Tier 2/3 support for user connectivity and access control issues across the organization.
• Ensure responsive communication and oversee critical remediation steps during outages and network failures.
• Maintain documentation for network infrastructure, compliance requirements and export‑controlled workflow.
• Educate technical staff members on best industry practices involving networked systems development and maintenance.

Qualifications

• Education: Bachelor’s degree in Engineering, Information Systems, Computer Science, or equivalent industry experience.
• Experience: 3‑7+ years of hands‑on experience as a Network Administrator.
• Experience with: Cisco‑based network infrastructure (Meraki, Site‑to‑site VPN, MX Firewall, Catalyst Series, ISE, etc.), common network protocols (DNS, DHCP, TCP/IP, RDP, HTTP(S), SAML, SSH, IPSec, IEEE 802.1X, etc.), and Microsoft Identity Management Systems (Entra, Active Directory, Intune).
• Fundamental understanding of network security protocols and common endpoint protection methodologies.
• Experience developing large‑scale network architecture in regulated industries (both in parallel with established systems and from‑scratch scenarios).
• Strong communication skills and experience working in a…