Staff OT/IT Engineer — On‑Site, Secure Infra, Equity

Commonwealth Fusion Systems LLC; Milpitas (CA); On-site; USD 166,000 - 240,000; Full time

Benefits offered by this job

Equity

Health, dental, and vision insurance

401(k) with employer matching

13 company-wide holidays

Flexible vacation

Sick days

Parental leave

Professional growth opportunities

Job summary

Commonwealth Fusion Systems LLC is hiring a Staff OT/IT Support Engineer to own on-site OT and IT infrastructure at the Milpitas site. You will deploy and maintain local server cabinets, industrial switches, cabling, and edge compute nodes for testing and manufacturing lines, while coordinating with central IT Security.

You will also serve as the on-site cybersecurity liaison, ensure secure-by-default standards, and escalate issues as needed in a fast-paced environment across manufacturing

Qualifications

• Self-starter who takes ownership of a physical site and maintains organized workspaces.
• Ability to collaborate with OT/IT teams and stakeholders in a high‑tempo environment.
• Strong communication to explain technical topics to non‑technical staff and engineering teams.

Responsibilities

• Maintain OT infrastructure, shop-floor equipment, and edge compute nodes.
• Install, configure, and secure networking gear in coordination with IT Security teams.
• Act as on-site Cybersecurity liaison, enforce secure-by-default standards, and respond to security events.

Skills

Autonomy

Ownership

Communication

On-site

Team collaboration

Troubleshooting

Tools

Kubernetes

Terraform

Ansible

vCenter

Proxmox

Job description

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 Milpitassite. This is a hands-on autonomous role split between managing shop-floor OT infrastructureand 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-performingsecure systems, while also maintaining and scaling the physical network and computeinfrastructure 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 seethem through to completion, where no two days are the same, equally comfortable runningcables, configuring network switches on the shop floor or or spotting something that doesn’t lookright 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 localsite 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 ofnetworking gear (switches, access points, edge firewalls) in coordination with centralNetwork and IT Security teams.
• Site Security Champion: Act as the on-site extension of the Cybersecurity team. Including butnot limited to; making sure new systems follow secure-by-default standards, serving as thelocal responder for security events, escorting and overseeing vendor access, and generallyraising 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 atthe Milpitas facility.
• Cross-Functional Collaboration: Partner with manufacturing engineers, control systemsteams, and corporate IT to safely integrate operational technology (OT) networks withcore enterprise systems.
• Process & Documentation: Create clear end-user documentation, standard operatingprocedures (SOPs), and site network layout diagrams.

What we’re looking for:

• Autonomous self-starters who take ownership of a physical site, maintaining highstandards for organized cabling, hardware staging, and overall technical workspacepresentation.
• 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 bothnon-technical staff and high-level engineering teams.
• Experience: 7+ years in a hands-on technical support, IT systems administration, or siteinfrastructure engineer role.
• OS Support: Deep familiarity with supporting and troubleshooting Windows, macOS, andbasic 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 hardwaretroubleshooting.
• Infrastructure as Code: Familiarity with Terraform, Ansible and using those patterns toscale out repeatable systems.
• Networking Fundamentals: Strong working knowledge of TCP/IP, VLANs, subnetting,DHCP, DNS, and basic CLI network switch configuration (Fortinet, Ubiquiti, Juniper, orsimilar).
• Identity & Endpoint Management: Experience with Active Directory, Okta, and modernendpoint management tools.
• Physical Presence & On-Site Capability: Ability to work 100% on-site in Milpitas, CA, liftup 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 modelsare

Must-have Requirements:

• Ability to lift up to 50 lbsoccasionally
• 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

$166,000 - $240,000 a year

Salary range for this full-time position + equity + benefits.The actual salary will depend on level, location, qualifications, and experience. The range displayed on each job posting reflects new hire salaries for the position across all US locations.

Benefits include:

• Competitive compensation with equity

• 13 Company-wide Holidays

• Flexible vacation days

• 10 sick days

• Generous parental leave policy

• Health, dental, and vision insurance

• 401(k) with employer matching

• Professional growth opportunities

• Team-building activities

#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.