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Forge Atomics

Factory-built water-cooled nuclear reactors

Senior Mechanical Engineer - Fluids

Full-Time
$140k - $190k/yr
Senior
Bachelor's
El Segundo, CA, USA
In PersonRelocation is required if not already local. Travel to reactor construction sites in other states may be required.
Mechanical EngineeringThermal & Fluids Engineering
No H1B Sponsorship

About the job

Requirements
  • A bachelor's degree in mechanical engineering or a related technical discipline.
  • At least 5 years of engineering experience designing, analyzing, and building mechanical hardware.
  • Strong interpersonal and collaborative skills, enthusiasm for problem solving, and desire to enable abundant clean energy.
  • At least 5 years of experience designing and analyzing fluid systems through professional work experience, project/research-based student experience, or a combination of both.
  • Experience acting as a technical lead by scoping work, reviewing designs and processes, and guiding other engineers to successful outcomes.
  • Ability to perform trade studies and make clear recommendations using first principles and engineering fundamentals, including with partial information.
  • Experience working at a nimble engineering organization or in a highly technical position requiring resourcefulness to accomplish tasks under tight time or budget constraints.
  • Hands-on experience with fluid, gas, or thermal systems.
  • Experience using test instrumentation and control components, such as pressure transducers, thermocouples, resistance temperature detectors, relays, and solenoid valves.
  • Experience designing highly integrated and complex fluid systems in high-reliability environments.
  • Ability to work extended hours and weekends as necessary.
Responsibilities
  • Design, build, and deploy fluid systems to support rapid reactor build and test timelines.
  • Perform detailed fluids analysis to characterize and troubleshoot expected design performance.
  • Work closely with the in-house build shop to develop and own the scaling of the manufacturing line for the system.
  • Support critical reactor test campaigns and operations by providing troubleshooting and technical support.
  • Develop and maintain detailed timelines to capture and communicate project progress.
  • Make high-value decisions on the fly and use feedback to continuously iterate and develop both product and process.
  • Provide training and mentorship to junior fluids engineers, setting the standard for technical rigor across the team.
  • Travel to reactor construction sites in other states as necessary.

About the company

Forge Atomics designs and builds factory-built, water-cooled nuclear fission reactors to provide reliable, carbon-free baseload power. Its core product is the Ember 25 MWe reactor, with a subscale Ember Mini prototype planned before moving to full-scale deployment. The reactors are manufactured in a factory setting, using proven water-cooled reactor technology with decades of operating experience, and then shipped as modules to site where they are installed, commissioned, and operated. The company aims to lower costs and speed deployment by using mature supply chains and a mass-production approach instead of on-site, bespoke construction. Its safety approach relies on passive safety features designed to make accidents physically unlikely. The ultimate goal is to offer safe, scalable nuclear power that complements or replaces intermittent renewables, improving energy security and reducing environmental impact.

Company Size

N/A

Company Stage

N/A

Total Funding

N/A

Headquarters

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Founded

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Simplify Jobs

Simplify's Take

What believers are saying

  • ANS reported Forge’s 2026 Launch Pad selection, validating momentum with nuclear-industry gatekeepers.
  • Forge’s September 2026 site positions Ember for data centers and grid buyers seeking firm power.
  • El Segundo hiring for engineering managers and interns signals active buildout, not paper-company theater.

What critics are saying

  • NRC licensing for a factory-built reactor can consume years before first revenue.
  • A 2026 intern posting still emphasizes export controls and full-time office work, signaling heavy compliance burden.
  • If Ember Mini misses milestones, 300 MWe factory economics collapse before the first reactor sale.

What makes Forge Atomics unique

  • Forge Atomics’ 25 MWe Ember uses factory-built, shippable PWR modules, not bespoke sites.
  • Factory 1 targets 300 MWe yearly output, a manufacturing model rare in nuclear.
  • Ember uses proven uranium dioxide fuel and natural-circulation passive safety, lowering technical novelty risk.

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Benefits

  • Health Insurance
  • Vision Insurance
  • Dental Insurance
  • 401(k) Retirement Plan
  • Stock Options
  • Employee Stock Purchase Plan
  • Paid Vacation
  • Paid Parental Leave
  • Paid Sick Leave