Mechanical Engineer - Plant Systems & BOP (Remote)

Applied Atomics LLC; United States; Hybrid; USD 138,000 - 195,000; Full time

Benefits offered by this job

Substantial incentive stock plan

Medical / Vision / Dental

Flexible PTO policy

Hybrid and remote work options

Job summary

Applied Atomics is seeking a Mechanical Engineer to support the design, development, and build-out of the major thermal-fluid systems for our FOAK nuclear plant. You’ll work with senior engineers on main steam, feedwater, condensate, ACC, heat exchangers, pumps, valves, piping, and auxiliary systems.

This remote role offers hands-on hardware experience, system integration, and ownership of major plant systems.

Qualifications

• Bachelor’s degree in Mechanical Engineering or related field.
• 2-4 years of mechanical or fluid system design experience (1-2 years with MS).
• Strong understanding of thermodynamics, heat transfer, fluid mechanics, material behavior, and structural mechanics.
• Experience with CAD tools (NX, SolidWorks, Creo, etc.).
• Experience with fluid system PID.
• Ability to perform engineering analysis using hand calcs and/or software.
• Exposure to industrial fluid systems, piping, pumps/compressors, heat exchangers, and/or turbomachinery.
• Familiarity with applicable mechanical/industrial codes and standards (ASME, API, NRC, NFPA).
• Strong technical communication and documentation skills.
• Eagerness to learn, ask questions, and contribute to a fast-moving, multidisciplinary team.

Responsibilities

• Design and develop balance-of-plant (BOP) systems and plant interfaces.
• Create mechanical design concepts, layouts, and piping configurations.
• Perform thermal, structural, and fluid analyses.
• Develop, review, and validate system models and simulations.
• Create and update CAD models and diagrams (NX, SolidWorks, Creo).
• Support vendor outreach and manufacturing, assembly, and installation.
• Prepare PDRs, CDRs, and design gate documents.
• Collaborate with interfacing system owners and engineering teams.
• Define and manage BOMs, component specs, and config control.
• Develop project schedules, budgets, and resource plans.
• Participate in hardware bring-up, field testing, and commissioning.

Skills

Thermodynamics

Heat Transfer

Fluid Mechanics

Structural Mechanics

CAD Proficiency

Fluid System PID

Engineering Analysis

Technical Communication

Team Collaboration

Education

Bachelor’s degree in Mechanical Engineering or related field

Tools

NX

SolidWorks

Creo

ANSYS

Abaqus

FEMAP

Job description

Mechanical Engineer (Balance of Plant / Plant Systems)

Remote, USA

Deploy the next generation of energy infrastructure with Applied Atomics

Applied Atomics delivers firm, clean electricity with proven technology. We design, build, and operate nuclear plants directly alongside the facilities they power. With n o reactor science or new fuel to invent , we have n o reason to stall. We are the first fully integrated nuclear power provider built to deploy now. Founded by a team of engineers and operators who built the launch sites, test complexes, and factories behind SpaceX , designed and commercialized nuclear reactors, and ran billion-dollar asset portfolios , the team is now focused on clean power deployment. Applied Atomics is b acked by Alpaca VC, Transition, and Morpheus Ventures.

About the role:

Applied Atomics is seeking a Mechanical Engineer to support the design, development, and build-out of the major thermal-fluid systems for our first-of-a-kind (FOAK) nuclear power plant. You’ll work alongside senior engineers to develop systems such as the main steam system, feedwater system, condensate system, air-cooled condenser (ACC), heat exchangers, pumps, valves, piping, and auxiliary thermal-mechanical equipment.

This is a high-impact role for an engineer who wants to learn fast, contribute to real hardware, and have ownership of major plant systems. You’ll perform engineering analysis, system modeling, CAD design, vendor coordination, testing support, and system integration. If you are a strong mechanical engineer who enjoys complex thermal-fluid systems, hands-on hardware, and startuppace, you’ll thrive here.

Why we need you

We are transitioning nuclear energy from a theoretical science into a practical reality, and that requires practical problem-solvers. We need engineers who are eager to take direct responsibility for their work and see it through to completion. Your role will be critical in transforming complex designs into safe, reliable, and operational power plants that will operate for decades to come.

What you will do

Key Responsibilities

• Work on the design and development ofbalance-of-plant (BOP) systems, including but not limitedto:main steam system & piping, feedwater system, condensate system, air-cooled condenser systems, heat exchangers and auxiliary systems, turbine-side thermal cycle equipment & interfaces.
• Support creation of mechanical design concepts, equipment layouts, and piping configurations.
• Ensure designs comply with applicable designcriteria, requirements, and system interfaces.
• Perform thermal, structural, and fluid analyses using hand calcs and engineering tools.
• Support development, review, and validation of system simulation and analytical models (e.g., thermal cycles, pressure drops, transient behavior, etc.).
• Create and update CAD models, drawings, and system diagrams(NX, SolidWorks, Creo, etc.).
• Proficient with fluid system PIDs.
• Develop and maintain design documentation, including descriptions, technical notes, calculations, and engineering change packages.
• Support preparation and presentation ofPDRs, CDRs, and internal design gates.
• Support vendor outreach for pumps, valves, heat exchangers, piping, instrumentation, and packaged equipment.
• Support manufacturing, assembly, and installation of BOP systems.
• Support development of test plans, integration procedures, and commissioning documentation.
• Participate in hardware bring-up, field testing, and system-level troubleshooting as needed
• Interpret and implement industry codes and standards (ASME,API, NRC, etc.).
• Collaborate with interfacing system owners.
• Supportdocumentation for regulatory submissions (e.g., NRC).
• Define and manage Bills of Materials (BOMs), component specifications, and configuration control.
• Develop system schedules, budgets, and resourceplans.

Additional Responsibilities

• Take end-to-end responsibility for your projects, from initial concepts through to deployment and ongoing operations
• Partner closely with our multidisciplinary team of experienced engineers to tackle complex, cross-functional challenges
• Deliver high-quality work steadily and safely, ensuring every solution meets our rigorous quality standards while also for solving scalability issues in the future
• Continually improve our internal engineering processes, documentation, and tools to support the team as we scale

What you bring to the table

Need to haves:

• Bachelor’s degree inMechanical Engineeringor related field.
• 2-4years ofmechanical or fluid system design experience(1-2years w/ MS).
• Strong understanding of mechanical fundamentals: thermodynamics, heat transfer, fluid mechanics, material behavior, and structural mechanics.
• Experiencewith CAD tools (NX, SolidWorks, Creo, etc.).
• Experience with fluid system PID.
• Ability to perform engineering analysis using hand calcs and/or software.
• Exposure to industrial fluid systems, piping, pumps/compressors, heat exchangers, and/or turbomachinery).
• Familiarity with applicable mechanical/industrial codes and standards (ASME, API, NRC, NFPA, etc.).
• Strong technical communication and documentation skills.
• Eagerness to learn, ask questions, and contribute to a fast-moving, multidisciplinary team.

Nice-to-haves:

• Master’s degree inMechanicalEngineeringorrelatedfield.
• 4+ years of experience in mechanical, industrial, aerospace, energy, oil & gas, thermal, or plant engineering roles.
• Experience with mechanical/industrial codes and applying to system designs (ASME, API, NRC, etc.).
• Experience with FEA (ANSYS, Abaqus, FEMAP, etc.).
• Hands-on experience with hardware builds, field work, testing, and/or commissioning.
• Experience supporting design of piping, pressure vessels, heat exchangers, or steam systems.

BENEFITS & PERKS FOR ELIGIBLE EMPLOYEES

• Substantial incentive stock plan for all full-time employees.
• Medical / Vision / Dental (details forthcoming).
• Flexible PTO policy.
• Hybrid and remote work options depending on role.
• Other benefits to be announced at offer stage.

We are an equal opportunity employer, and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law.We are unable to provide visa sponsorship at this time.This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls.

Remote pay range

$138,342 - $195,322 USD

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