Senior Mechanical Engineer (Vessels) System OneSenior Mechanical Engineer (Vessels)Bellevue, WARemote$69–$115 / hourPerform detailed design, analysis, and documentation for ASME Section III Class HB and/or Section VIII division 2 vessels, including nozzles, flanges, support brackets, and other support elements used in nuclear facilities. Minimum of six years of equipment / component design experience for level 10 or minimum of ten years of equipment / component design experience for level 11; relevant M.S. degree credited as two years of experience.
NewSenior Mechanical Engineer System OneSenior Mechanical EngineerBellevue, WASystem One, and its subsidiaries including Joulé and Mountain Ltd., are leaders in delivering outsourced services and workforce solutions across North America. Working experience with ASME Boiler & Pressure Vessel Code Section III.
Senior Mechanical Engineer - Remote System OneSenior Mechanical Engineer - RemoteSeattle, WARemote$55–$75 / hourThis position will play a key role in managing multi-discipline engineering efforts, supporting EPCm-style projects, and ensuring successful project execution across safety, quality, cost, and schedule. This role is ideal for a hands-on engineering professional who is experienced across the full project lifecycle—from concept and pre-FEED through commissioning and startup.
NewSenior Mechanical Design Engineer System OneSenior Mechanical Design EngineerBellevue, WARemote$52–$85 / hourThe ideal candidate has extensive experience in mechanical equipment design, structural analysis, and product development, with the ability to collaborate across multidisciplinary engineering teams to deliver innovative engineering solutions. This role focuses on the conceptual and preliminary design of reactor core components, reactor structures, and Nuclear Island equipment for next-generation nuclear energy systems.
NewMechanical Engineer IV (Opto -AR/VR) BC ForwardMechanical Engineer IV (Opto -AR/VR)Redmond, WAFull timeThe ideal candidate will have strong experience in mechanical design for electromechanical sensor integration, wearable hardware, and optical systems for AR/VR and a proven ability to deliver robust designs from concept through production while meeting performance and reliability targets . With delivery centers and offices across North America and India, we take pride in building long-term relationships and delivering excellence through innovation, collaboration, and integrity.
NewMechanical Design Engineer System OneMechanical Design EngineerBellevue, WA$52–$85 / hourYou will work within a high-performing, multi-disciplinary engineering team that includes materials science and thermal-hydraulics experts to develop novel analysis methodologies and support the design of next-generation reactor hardware. This position will report to the MCFR Mechanical Design Manager and play a critical role in the mechanical analysis, scripting, and design scoping of reactor components.
CRD System Design Engineer (Mechanical) System OneCRD System Design Engineer (Mechanical)Bellevue, WARemote$54–$90 / hourThe selected candidate will collaborate with project managers, design engineers, analysts, test engineers, supply chain teams, and other engineering disciplines to support the successful development and deployment of advanced reactor technology. The successful candidate will demonstrate strong technical leadership, engineering excellence, attention to detail, and the ability to thrive in a fast-paced, collaborative engineering environment.
RAC System Design Engineer (Mechanical) System OneRAC System Design Engineer (Mechanical)Bellevue, WARemote$54–$90 / hourThe selected candidate will collaborate with project managers, design engineers, analysts, test engineers, and multidisciplinary engineering teams to support the successful design, integration, and deployment of this first-of-a-kind reactor technology. This role will support the ongoing development of a passive reactor cooling system designed to continuously remove heat through natural convection, providing safe and reliable cooling without reliance on pumps or operator actions.
Senior Hardware Engineer, Automation Amazon.com Services LLCSenior Hardware Engineer, AutomationSeattle, WAThis role requires deep experience with automated assembly systems, robotic platforms, material handling, and safety systems, along with the ability to think holistically—connecting vendor evaluation, mechanical design, and system-level performance. - Independently design, develop, and validate mechanical hardware for automated systems including workstations, robotic arms, safety systems, material handling, and part load/unload mechanisms.
NewMechanical Designer System OneMechanical DesignerBellevue, WA$37–$74 / hourDesign mechanical and structural components, test fixtures, flow loops, rigs, and sub-scale test articles. Experience creating fabrication drawings and applying Design for Manufacturability (DFM) and Design for Assembly (DFA) principles.
Senior Mechanical Designer System OneSenior Mechanical DesignerBellevue, WA$69–$115 / hourThis role is responsible for creating structural and mechanical design solutions, developing 3D CAD models, and producing detailed engineering drawings to support conceptual and preliminary design efforts. System One is seeking a highly motivated Senior Mechanical Designer to support the design and development of advanced Generation IV nuclear reactor systems.
Nuclear Engineering Program Developer System OneNuclear Engineering Program DeveloperBellevue, WARemote$56–$95 / hourThe successful candidate will coordinate with engineers working on systems, components, or engineering analysis areas such as safety analysis, thermal analysis, stress analysis, and/or process/control analysis. Provide inputs on plant level and system level requirements, specifications, and strategy documents related to plant operations and maintenance activities over the lifecycle of a nuclear facility.
Senior Engineer System OneSenior EngineerBellevue, WARemote$56–$95 / hourThe successful candidate will be responsible for preparing, reviewing, and certifying Design Specifications (DS) and Design Reports (DR) in accordance with ASME Boiler & Pressure Vessel Code Section III , while supporting regulatory, compliance, and customer deliverables. System One is seeking an experienced Senior Mechanical Engineer to support the design and development of reactor structures and components for a next-generation Generation IV advanced nuclear reactor program.
CFD & CAD Expert — AI Evaluation & Quality Review BraintrustCFD & CAD Expert — AI Evaluation & Quality ReviewSeattle, WAIn this project-based role, you will review, annotate, and evaluate highly technical engineering content, applying your domain expertise to ensure the accuracy and quality of datasets used for AI training. We are seeking a Mechanical Engineering expert with advanced CAD and Computational Fluid Dynamics (CFD) experience to support a leading AI lab developing next-generation engineering AI models.
Probabilistic Risk Assessment (PRA) Engineer (Entry Level) System OneProbabilistic Risk Assessment (PRA) Engineer (Entry Level)Bellevue, WARemote$37–$74 / hourThe selected candidate will contribute to the development and maintenance of PRA models, perform risk analyses, support hazard evaluations, and collaborate with engineering teams to ensure safe, reliable, and innovative reactor designs. This role offers an excellent opportunity to work with a multidisciplinary engineering team performing probabilistic risk assessments, severe accident analysis, and safety evaluations that support reactor design, licensing, and regulatory compliance.
NewSystem Design Engineer System OneSystem Design EngineerBellevue, WA$69–$115 / hourThis role will support the Sodium Processing Systems team , focusing on system design, vendor coordination, and integration of hardware into overall plant system architecture for a next-generation nuclear reactor program. Bachelor’s degree in Mechanical Engineering, Chemical Engineering, or related discipline from an accredited university.
Fuel Handling Design Engineer System OneFuel Handling Design EngineerBellevue, WA$52–$85 / hourInterface with cross-functional design disciplines (mechanical, instrumentation & controls, civil, nuclear) to develop plant design information and define system design/performance criteria. Physical requirements include sitting and/or standing for extended periods, bending/stooping, grasping/gripping, fine motor control, with minimal physical exertion, including the ability to safely lift up to 25 pounds.
Weld Engineer System OneWeld EngineerBellevue, WA$63–$80 / hourThis is a hands-on, high-impact role where your weld engineering and metallurgy expertise will influence how advanced components are designed, tested, qualified, and transitioned into supplier-ready manufacturing processes. System One is seeking a highly motivated Weld Engineer to support a Materials Development & Qualification team advancing next-generation materials and components for sodium-cooled fast reactors .
Plant Integration Engineer – Steam & Power Systems System OnePlant Integration Engineer – Steam & Power SystemsBellevue, WA$56–$96 / hourMinimum 10 years of experience in nuclear power plant design, commercial power generation, power plant modifications, oil & gas, refining, chemical processing, or large industrial process facilities. Experience with: Steam cycle systems, Heat exchangers, Thermal energy storage, Molten salt systems, Balance of Plant (BOP), Energy Island design, Nuclear Island integration.
System Transients Analysis Engineer System OneSystem Transients Analysis EngineerBellevue, WARemote$67–$110 / hourThis role will focus on thermal hydraulic and transient analysis activities supporting advanced reactor system design, plant operations analysis, and control system integration. System One is seeking a highly capable and motivated System Transients Analysis Engineer to support an advanced sodium-cooled reactor program.
NewPlant Integrated Analysis Engineer System OnePlant Integrated Analysis EngineerBellevue, WARemote$37–$74 / hourWorking as part of a multidisciplinary engineering team, you'll collaborate with safety, instrumentation & controls (I&C), and system design engineers to model, analyze, and validate complex plant systems. This role will focus on plant-level thermal-hydraulic analysis, transient modeling, and control system performance to support reactor design, safety, and operational excellence.
RAC Component Design Engineer (Ventilation) System OneRAC Component Design Engineer (Ventilation)Bellevue, WARemote$50–$80 / hourProvide technical direction and interface to supplier projects, working with supply chain teams to ensure delivery of engineering designs and other deliverables, as well as coordination and performance of technical reviews of deliverables. Interface with and support licensing activities needed to obtain both the construction and operating licenses for the reactor systems including development of safety analysis reports, technical specifications, topical reports, and other licensing documents.
Component Engineer, Nuclear System OneComponent Engineer, NuclearBellevue, WARemote$52–$85 / hourSystem One, and its subsidiaries including Joulé and Mountain Ltd., are leaders in delivering outsourced services and workforce solutions across North America. This role may require sitting or standing for extended periods, with tasks including bending, grasping, and fine motor control.
NewThermal Analysis Engineer System OneThermal Analysis EngineerBellevue, WA$52–$85 / hourPerform thermal modeling of fluid-structure interfaces, including metallic structure thermal problems with structure conductive heat transfer, air convective heat transfer, radiation, and sodium-structure heat transfer modes. Work with our client’s component design leads and analysis engineers to evaluate specific component issues, develop local models or modify existing, and provide insights and feedback to design teams for action.
Senior Welding Engineer System OneSenior Welding EngineerBellevue, WA$56–$95 / hourSystem One is seeking a Senior Welding Engineer for a yearlong contract role to work as part of a high-functioning team of engineers focused on materials processing, supply chain development and supplier qualification for next generation material and components for sodium-cooled fast reactors. Oversee test programs for qualification of welds, including mechanical properties, burst testing, thermal creep, creep-fatigue, neutron irradiation, thermal aging, and sodium exposure.
Senior Component Design Engineer (RPA) – Contract System OneSenior Component Design Engineer (RPA) – ContractBellevue, WARemote$56–$95 / hourRequirements B.S. degree in Mechanical Engineering or equivalent (minimum of eight years of equipment/component design experience; relevant M.S. degree credited as two years of experience). System One, and its subsidiaries including Joulé and Mountain Ltd., are leaders in delivering outsourced services and workforce solutions across North America.
Test Engineer System OneTest EngineerBellevue, WA$37–$74 / hourThe selected candidate will work closely with multidisciplinary engineering teams, designers, technicians, and project stakeholders to develop innovative test solutions, execute test campaigns, analyze results, and deliver high-quality technical documentation. This role is ideal for an engineer with experience in research and development (R&D), mechanical testing, and experimental validation who enjoys solving complex engineering challenges in a collaborative environment.
Component Design Engineer (RPA) – Contract System OneComponent Design Engineer (RPA) – ContractBellevue, WARemote$52–$85 / hourSupport continuous learning and application of nuclear industry best practices to maintain the highest quality of engineering design and proactively identify process change/enhancement opportunities. The Component Design Engineer (RPA) will work as part of a high functioning team of engineers and scientists focused on developing the design of next generation advanced nuclear reactors.
NewDiesel Technician/Mechanic III - Entry Level Penske Truck RentalDiesel Technician/Mechanic III - Entry LevelSEATTLE, WAWillingness to work the required schedule, work at the specific location required, complete Penske employment application, submit to a background screening (to include criminal checks, past employment and education), the ability to pass a drug screen and physical as required by the Department of Transportation, and potential travel within a near geography for training are required. • Doing preventative maintenance repairs—like replacing or rotating tires—and completing vehicle component lubrication and replacement, some electrical system repairs, and cooling system maintenance on gas and diesel engine vehicles.
Embedded Solutions Engineer – Space Systems JobotEmbedded Solutions Engineer – Space SystemsSeattle, WA$126,000–$250,000 / yearFPGA Integration (Optional): Experience interfacing with or developing alongside FPGAs, including familiarity with common communication interfaces (AXI, PCIe, custom parallel buses),register-mapped peripheral access from embedded Linux or bare-metal environments, and collaborative bring-up with digital design engineers. Excellent Communication Skills: Effectively convey ideas and communicate technical topics with engineering, build staff, and operations; run self-directed design reviews and participate in reviews of parallel systems.
Applications Engineer / BAS Programmer JobotApplications Engineer / BAS ProgrammerSeattle, WARemote$90,000–$120,000 / hourThe right candidate will work closely with engineering, project management, and field teams to turn mechanical and electrical system designs into fully operational BAS and controls platforms that optimize building performance, reliability, and efficiency. Information collected and processed as part of your Jobot candidate profile, and any job applications, resumes, or other information you choose to submit is subject to Jobot's Privacy Policy, as well as the Jobot California Worker Privacy Notice and Jobot Notice Regarding Automated Employment Decision Tools which are available at jobot.com/legal.
Intern - Mechanical Engineering (Aerospace) Parker Hannifin CorporationIntern - Mechanical Engineering (Aerospace)Woodmont Beach, WA$18.42–$30.70 / hourInternFull timeOur passionate people with deep engineering expertise, together with our breadth of differentiated technologies, ensure that we make the extraordinary happen and continue to shape the future of aviation in partnership with our customers. That is why we are so proud of everyone in our Exotic family who strives to be the best at what they do every day, working as a collaborative team in a culture of continuous improvement to stretch the bounds of creative thinking and provide quality products to our customers around the globe.
R&D Lab Technician - Mechanical Engineering Yoh Services LLCR&D Lab Technician - Mechanical EngineeringRedmond, WAFull timePhysical Requirements:* Ability to lift and move materials up to 50 lbs.* Ability to stand for extended periods and perform hands-on assemblyEstimated Min Rate: $35.00Estimated Max Rate: $40.00/hr+ Depends on work experience. R&D Lab Technician - Mechanical EngineeringWe are seeking a hands-on R&D Lab Technician to support our Mechanical Engineering team in prototyping, assembly, testing, and lab operations.
Senior Mechanical Engineer P2S, Inc.Senior Mechanical EngineerSeattle, WA$148,000–$180,000 / yearFull timeThird-Party Recruiting DisclaimerLegence and its affiliates do not accept unsolicited resumes from agencies; any such submissions without a prior signed agreement authorized by Legence Holdings LLC's CHRO or Director of Talent Acquisition will not incur fees and are considered property of Legence. The company specializes in designing, fabricating, and installing complex HVAC, process piping, and other mechanical, electrical, and plumbing (MEP) systems-enhancing energy efficiency, reliability, and sustainability in new and existing facilities.
Senior Mechanical Engineer - Buildings Colliers Engineering & DesignSenior Mechanical Engineer - BuildingsSeattle, WA$106,600–$140,000 / yearFull timeWe have also created an internal culture that provides the resources and technology needed to encourage personal and professional growth opportunities through reimbursement for education; a free in-house resource for hundreds of educational and self-enrichment courses; mentorship program; wellness program; Women's Organization and ongoing philanthropic opportunities. We provide a full range of mechanical engineering services to municipal, commercial, higher education and public works agencies, partnering with clients to design buildings from the ground-up or to renovate existing buildings to optimize their use.
Mechanical Engineer II Blue Origin LLCMechanical Engineer IISeattle, WAFull timeand/or transports placardable amounts of hazardous materials by ground in any vehicle on a public road while in commerce, may be subject to additional Federal Motor Carrier Safety Regulations including: Driver Qualification Files, Medical Certification (obtained before onboarding), Road Test, Hours of Service, Drug and Alcohol Testing (CDL drivers only), vehicle inspection requirements, CDL requirements (if applicable) and hazardous materials transportation/shipping training. ITAR RequirementsTo conform to U.S. Government commercial space technology export regulations, including the International Traffic in Arms Regulations (ITAR), 8 U.S.C. § 1324b(a)(3), applicants for employment at Blue Origin must be a U.S. citizen or national, lawfully admitted for permanent residence into the U.S. (i.e. current green card holder), or lawfully admitted as a refugee or granted asylum under 8 U.S.C. § 1157-1158.
Senior Mechanical Engineer (10+ Years) Coffman EngineersSenior Mechanical Engineer (10+ Years)Seattle, WAFull timeOur broad range of markets, clients, and services, coupled with industry-leading talent, provides unique and exciting opportunities to grow as professionals, serve clients, and make a difference in our communities. The role involves working across varied project delivery approaches, managing projects through design and execution, and focusing on sustainable engineering solutions.
Mechanical Department Manager - Buildings Colliers Engineering & DesignMechanical Department Manager - BuildingsSeattle, WA$145,000–$209,000 / yearFull timeWe have also created an internal culture that provides the resources and technology needed to encourage personal and professional growth opportunities through reimbursement for education; a free in-house resource for hundreds of educational and self-enrichment courses; mentorship program; wellness program; Women's Organization and ongoing philanthropic opportunities. We provide a full range of mechanical engineering services to municipal, commercial, higher education and public works agencies, partnering with clients to design buildings from the ground-up or to renovate existing buildings to optimize their use.
Senior Mechanical Engineer | Seattle, WA IMEG Corp.Senior Mechanical Engineer | Seattle, WAQueen Anne, WAFull timeIMEG is hiring a Senior Mechanical Designer in Seattle, Washington, to lead design efforts as a project manager or lead designer for moderate to complex projects and support delivery of larger, high-complexity work with limited senior oversight. In this role, you will provide project direction, engineering solutions, and client guidance while overseeing project management, engineering analysis, design, and implementation of mechanical systems for the vertical building industry.
Associate Mechanical Engineer McKinstryAssociate Mechanical EngineerSeattle, WA$111,420–$187,000 / yearFull timeSPG. account executives to scope and deliver projects such as steam heating conversions, rooftop unit replacement, boiler and chiller replacement, and tenant improvements ranging from commercial office to higher education to life sciences and healthcare. contingent upon successfully passing a pre-employment drug and alcohol test, complying with the requirements of the Immigration Reform and Control Act and a Confidentiality Agreement, in addition to successful outcomes of background and reference checks.
Associate Principal Mechanical Engineer - Data Centers McKinstryAssociate Principal Mechanical Engineer - Data CentersSeattle, WA$130,320–$224,400 / yearFull timeThe role will be a key member of the DCI leadership team representing the Engineering and Design department professionally by engaging deeply with customers to understand their long term needs and plans and make a compelling case for selecting the McKinstry team. contingent upon successfully passing a pre-employment drug and alcohol test, complying with the requirements of the Immigration Reform and Control Act and a Confidentiality Agreement, in addition to successful outcomes of background and reference checks.
Lead Engineer - Mechanical McKinstryLead Engineer - MechanicalSeattle, WAFull timecontingent upon successfully passing a pre-employment drug and alcohol test,complying withthe requirements of the Immigration Reform and Control Act and a Confidentiality Agreement, in addition to successful outcomes of background and reference checks. Proficient and able to coach/delegate mechanical systems design, including calculations, airside systems, piping systems, equipment selection and multidiscipline coordination.
Mechanical Design Engineer III - Blue Ring Mechanisms Blue Origin LLCMechanical Design Engineer III - Blue Ring MechanismsSeattle, WAFull timeand/or transports placardable amounts of hazardous materials by ground in any vehicle on a public road while in commerce, may be subject to additional Federal Motor Carrier Safety Regulations including: Driver Qualification Files, Medical Certification (obtained before onboarding), Road Test, Hours of Service, Drug and Alcohol Testing (CDL drivers only), vehicle inspection requirements, CDL requirements (if applicable) and hazardous materials transportation/shipping training. ITAR RequirementsTo conform to U.S. Government commercial space technology export regulations, including the International Traffic in Arms Regulations (ITAR), 8 U.S.C. § 1324b(a)(3), applicants for employment at Blue Origin must be a U.S. citizen or national, lawfully admitted for permanent residence into the U.S. (i.e. current green card holder), or lawfully admitted as a refugee or granted asylum under 8 U.S.C. § 1157-1158.
Lead Mechanical Engineer McKinstryLead Mechanical EngineerSeattle, WA$95,310–$155,700 / yearFull timeSPG. account executives to scope and deliver projects such as steam heating conversions, rooftop unit replacement, boiler and chiller replacement, and tenant improvements ranging from commercial office to higher education to life sciences and healthcare. Employment iscontingent upon successfully passing a pre-employment drug and alcohol test, complying with the requirements of the Immigration Reform and Control Act and a Confidentiality Agreement, in addition to successful outcomes of background and reference checks.
Mechanical Design Engineer (Contract) Zeno PowerMechanical Design Engineer (Contract)Seattle, WA$65–$80 / hourFull timePerson" means (i) a U.S citizen or U.S. national; or (ii) any natural person who is a U.S. Lawful Permanent Resident (i.e., holds a Green Card), as defined by 8 U.S.C. 1101(a)(20) or as a "protected individual" defined by 8 U.S.C. 1324b(a)(3) (i.e., admitted as a refugee or is granted asylum). Zeno is seeking a highly motivated Mechanical Design Engineer to support the mission-oriented efforts of developing and bringing to market Radioisotope Power Systems (RPS) technologies.
Mechanical Design Engineer Remote (Contractor) Zeno PowerMechanical Design Engineer Remote (Contractor)Seattle, WARemoteFull timePerson" means (i) a U.S citizen or U.S. national; or (ii) any natural person who is a U.S. Lawful Permanent Resident (i.e., holds a Green Card), as defined by 8 U.S.C. 1101(a)(20) or as a "protected individual" defined by 8 U.S.C. 1324b(a)(3) (i.e., admitted as a refugee or is granted asylum). Zeno is seeking a highly motivated Mechanical Design Engineer to support the mission-oriented efforts of developing and bringing to market Radioisotope Power Systems (RPS) technologies.
Mechanical Design Engineer Zeno PowerMechanical Design EngineerSeattle, WA$105,000–$125,000 / yearFull timeZeno is seeking a highly motivated Mechanical Design Engineer to support the engineering efforts of developing Radioisotope Power Systems (RPSs) for applications from the seabed to the surface of the moon. Person" means (i) a U.S citizen or U.S. national; or (ii) any natural person who is a U.S. Lawful Permanent Resident (i.e., holds a Green Card), as defined by 8 U.S.C. 1101(a)(20) or as a "protected individual" defined by 8 U.S.C. 1324b(a)(3) (i.e., admitted as a refugee or is granted asylum).
Mechanical Project Engineer I McKinstryMechanical Project Engineer ISeattle, WA$31.03–$47.26 / hourFull timeEmployment iscontingent upon successfully passing a pre-employment drug and alcohol test, complying with the requirements of the Immigration Reform and Control Act and a Confidentiality Agreement, in addition to successful outcomes of background and reference checks. Every design choice is made toward one goal - delivering high-performance buildings that ensure occupant comfort and safety, keep energy/operating costs low, maximize client profitability, and protect the environment.
Project Engineer III- Mechanical McKinstryProject Engineer III- MechanicalSeattle, WA$39.20–$62.31 / hourFull timecontingent upon successfully passing a pre-employment drug and alcohol test, complying with the requirements of the Immigration Reform and Control Act and a Confidentiality Agreement, in addition to successful outcomes of background and reference checks. Every design choice is made toward one goal - delivering high-performance buildings that ensure occupant comfort and safety, keep energy/operating costs low, maximize client profitability, and protect the environment.