Staff OT/IT Support Engineer

About Commonwealth Fusion Systems:  Commonwealth Fusion Systems is on a mission to deliver the urgent transition to fusion energy. Combining decades of research, top talent, and new technologies, we’re designing and building commercially viable fusion power plants. And we're working with policymakers, suppliers, and many others to build the energy industry of the future. We’re in the best position to make it happen. Since 2018, we’ve raised $4 billion of capital, making us the largest and leading fusion company in the world. Now we’re looking for more thinkers, doers, builders, and makers to join us. People who’ll bring new perspectives, solve tough problems, and thrive as part of a team. If that’s you and this role fits, we want to hear from you.
Join the power movement as a Staff OT/IT Support Engineer

We are looking for a versatile, hands-on Staff OT/IT Engineer to join our team at our Milpitas site. This is a hands-on autonomous role split between managing shop-floor OT infrastructure and site wide IT infrastructure. You will serve as the primary on-site technical point of contact, ensuring our engineers, technicians, and operations teams have reliable, high-performing secure systems, while also maintaining and scaling the physical network and compute infrastructure that powers our testing and manufacturing operations (Operational Technology / OT).

If you thrive in high-tempo environments, are able to take ownership of unfamiliar tasks and see them through to completion, where no two days are the same, equally comfortable running cables, configuring network switches on the shop floor or or spotting something that doesn’t look right and escalating it to the security team, this is the role for you.

What you'll do:

OT & Industrial Infrastructure Maintenance: Deploy, monitor, maintain and secure local site server cabinets, industrial network switches, patch panels, cabling, power equipment (UPSs), and edge compute nodes supporting test rigs and manufacturing lines.

Network & Systems Setup: Perform physical installation and basic configuration of networking gear (switches, access points, edge firewalls) in coordination with central Network and IT Security teams.

Site Security Champion: Act as the on-site extension of the Cybersecurity team. Including but not limited to; making sure new systems follow secure-by-default standards, serving as the local responder for security events, escorting and overseeing vendor access, and generally raising the security posture of the site.

Site Tech Asset Management: Maintain accurate asset tracking, hardware inventory, rack elevations, and lifecycle management for all IT/OT endpoints and spare hardware at the Milpitas facility.

Cross-Functional Collaboration: Partner with manufacturing engineers, control systems teams, and corporate IT to safely integrate operational technology (OT) networks with core enterprise systems.

Process & Documentation: Create clear end-user documentation, standard operating procedures (SOPs), and site network layout diagrams.

What we’re looking for:

Autonomous self-starters who take ownership of a physical site, maintaining high standards for organized cabling, hardware staging, and overall technical workspace presentation.

A hybrid problem solver who can work face-to-face with stakeholders while staying
deeply connected to core OT/IT infrastructure.

Strong communicators capable of explaining complex technical topics clearly to both non-technical staff and high-level engineering teams.

Experience: 7+ years in a hands-on technical support, IT systems administration, or site infrastructure engineer role.

OS Support: Deep familiarity with supporting and troubleshooting Windows, macOS, and basic Linux (Ubuntu/RedHat) environments. Kubernetes experience is a plus.

Infrastructure & Cabling: Demonstrated hands-on experience racking/stacking servers, patch panel punching, cat6 ethernet cabling, clean cable management, and hardware troubleshooting.

Infrastructure as Code: Familiarity with Terraform, Ansible and using those patterns to scale out repeatable systems.

Networking Fundamentals: Strong working knowledge of TCP/IP, VLANs, subnetting, DHCP, DNS, and basic CLI network switch configuration (Fortinet, Ubiquiti, Juniper, or similar).

Identity & Endpoint Management: Experience with Active Directory, Okta, and modern endpoint management tools.

Physical Presence & On-Site Capability: Ability to work 100% on-site in Milpitas, CA, lift up to 50 lbs of hardware, and work safely around laboratory or light industrial equipment.

Bonus points for:

Kubernetes and Cloud (AWS) experience

On-prem virtualization with vCenter and Proxmox

Database fundamentals around Postgres and Timescale

Comfort using AI tooling and a keen ability to discern hallucinations

An old school sysadmin who has transitioned to an SRE that lives by the devops mindset

Someone who loves clear documentation and knows what a PLC and the purdue models are

Must-have Requirements:

Ability to lift up to 50 lbs occasionally

Perform activities such as stooping, climbing, standing, sitting for extended periods of time

Willingness to travel or work required nights/weekends/on-call occasionally

Dedication to safety to mitigate industrial hazards that may include heat, cold, noise, fumes, strong magnets, lead (Pb), high voltage, high current, pressure systems, and cryogenics

#LI-Onsite
At CFS, we excel in fast-paced environments, driven by our values of integrity, execution, impact, and self-critique. As we grow, we’re eager to bring on mission-driven folks who offer diverse perspectives and fresh ways to tackle challenges. We value diversity deeply and are proud to be an equal opportunity employer by choice. We consider all qualified applicants equally, regardless of race, color, national origin, ancestry, citizenship status, protected veteran status, religion, physical or mental disability, marital status, sex, sexual orientation, gender identity or expression, age, or any other basis protected by law. This role requires compliance with U.S. laws concerning the export of controlled or protected technologies or information (collectively, “Export Control Laws"). Any offer of employment will be contingent on the need for compliance with such Export Control Laws.