Senior Mechanical Test Engineer (II/III) - On-Site
X-Energy, LLC
X-Energy, LLC is seeking a Test Engineer to oversee testing activities for advanced reactor technologies. This role involves planning, developing, and executing test programs while coordinating with engineers to ensure all requirements are met. Ideal candidates will have a Bachelor's degree in engineering, relevant experience, and hands-on testing skills. The position is based in Rockville, Maryland with a hybrid schedule of 4 days in the office. Competitive compensation and benefits include a 401(k) plan, medical insurance, and paid time off. #J-18808-Ljbffr X-Energy, LLC
$76.09k - $126.82k
..., and execution of test activities for advanced... ...with system engineers to identify required... ...Bachelor’s degree in mechanical, electrical, or nuclear... ...field. Level II: Typically two years... ...engineering role. Level III: Typically five... ...to travel to vendor sites regularly. Location...WebsiteWork at office$100k - $144k
...development, and execution of test activities for the advanced... ...will coordinate with system engineers to identify required testing,... ...Qualifications Bachelor’s degree in mechanical, electrical, or nuclear... ...Engineering. Travel to vendor sites on a regular basis may be...WebsiteFull timeWork at officeRemote work$90k - $150k
...Scientist track (Research Scientist I, II, III, and Senior Research Scientist). Candidates are... ...blood cell production for transfusion; engineering animal-derived blood products; and developing... ...Principal Investigators and other site and Geneva personnelProcure supplies...SeniorWebsiteWork at officeFlexible hours$100k - $153k
...and most ambitious space missions. SENIOR MECHANICAL ENGINEER SENIOR I/II As a Mechanical Engineer at Rocket... ...SOWs * Support travel or off-site work to suppliers, customers, and other... ...standards, environments, verification tests and requirements * Experience...SeniorWebsitePermanent employmentFull timeLocal areaFlexible hours$100k - $144k
Alumni Ventures in Rockville, Maryland, is seeking a Test Engineer to plan and execute test activities for advanced reactor technologies. The role involves coordinating with engineers, overseeing hardware lifecycle, and maintaining communication of results. Qualified candidates...Suggested$166.1k - $185.2k
.... Job Description: Cydecor is looking for a Senior Navy Mechanical Engineer to analyze UxV designs and tackle technical challenges in... ...ability to access job openings or apply for a job on this site because of your disability. You can request assistance by...SeniorWebsiteHourly payContract workTemporary workFor contractorsWork experience placementFor subcontractorInterim role$115k - $140k
Description: MaxCyte is seeking a Senior Mechanical Engineer I/II to develop innovative single-use fluid control assemblies and supporting instrumentation... ...analyses and FEA. Drive prototype builds, engineering testing, and failure/root-cause analysis. Evaluate and optimize...Senior- Senior Scientist II - Translational Pathologist Job Category : Research Requisition Number : SENIO001905 Posted : March 17, 2026 Full-Time On-site Locations Showing 1 location Headquarters 9704 Medical Center Dr Rockville, MD 20850, USA The Senior Scientist II -...SeniorWebsiteFull time
$115k - $140k
Job Title: Senior Mechanical Engineer II Location: Gaithersburg, MD (Onsite) Hours/Schedule: Monday - Friday, Standard Business Hours Compensation... ...FEA, and root cause investigations Support prototyping, testing, and design verification activities Design sterile single...SeniorMonday to Friday- System One is looking for a Senior Mechanical Engineer II in Gaithersburg, MD. This hands-on role supports the design and development of mechanical systems in GMP manufacturing. Candidates should have extensive experience in mechanical design, particularly in regulated...Senior
$164.74k - $237.95k
...Senior UI/UX Designer II Employment Type: Full-Time, Experienced Department... ...implementation of multiple sites and applications across multiple... ...with federal practice engineers and federal clients to define... ..., requirements, coding, testing, and user testing and evaluation...SeniorWebsiteFull timeWork at officeFlexible hours- ...Senior Lead Network Engineer II Employment Type: Full Time CGS is seeking an experienced Senior Lead... ...infrastructure, and the associated systems testing, vulnerability assessments, and... ...equivalent Experience utilizing (RF) site survey tools such as Ekahau, RF...SeniorWebsiteFull timeLocal areaRemote workMonday to FridayFlexible hours
$115.6k - $176.3k
Senior Scientist II - Cell Line Development Job Category : Development Requisition Number : SENIO... ...Posted : March 26, 2026 Full-Time On-site Locations Showing 1 location Rockville... ...and Working Cell Bank production and testing, and will support mammalian cell culture...SeniorWebsiteFull timeLocal areaWeekend work- ...professionals to join our Mechanical Engineering team in the role of... ...prototyping, testing, and commissioning. Responsibilities... ...Code (BPVC) Section III, Division V Job Level... ...Qualifications Level II Level Tasks/... ...Road, Rockville MD Work Site Expectations 4 days in...WebsiteFull timeInternshipWork at office
$79.5k - $132.5k
...professionals to join our Mechanical Engineering team in the role of... ...prototyping, testing, and commissioning. Job... ...Vessel Code (BPVC) Section III and/or Section VIII.... ...Qualifications Level II Level Tasks/Responsibilities... ..., Rockville MD Work Site Expectations 4‑5 days...WebsiteFull timeInternshipWork at officeMonday to Friday$95k - $120k
...-Energy is seeking a test hardware design engineer to join our nuclear auxiliary... ..., and testing mechanical systems, assemblies,... ...Code (BPVC) Section III and/or Section VIII.... ...Qualifications Level II Level Tasks/Responsibilities... ..., Rockville MD Work Site Expectations 4 days...WebsiteFull timeInternshipWork at office$77.7k - $129.5k
HVAC Mechanical Design Engineer X-energy LLC is hiring an HVAC Mechanical Design Engineer to support a Plant and Process Design team. The role includes... ...Expectations Location: 530Gaither Road, Rockville,MD. Work site: 4days onsite per week. Travel: up to 10% as needed. Hours:...WebsiteMonday to Friday$97.76k - $137.53k
...greater impact together. What You'll do We are seeking a Senior Performance Test Engineer with Appian experience to support performance testing efforts... ...clearance) This is a hybrid position and will require on‑site presence at our Groundswell HQ in McLean or other client...SeniorWebsiteContract workLocal areaImmediate startFlexible hours$125.4k - $198.2k
...LLC is hiring a Plant & Process Design Engineer to support its Reactors team. This role... ...responsible for designing and developing mechanical systems and components. It includes identifying... ...: 530 Gaither Road, Rockville, MD Work Site Expectations: 4 days onsite Travel...WebsiteFull timeContract workFor subcontractorWork at office$95k - $115k
...responsible for performing engineering tasks associated with... ...appropriate materials, test methods, codes and standards... ...by manager. Level II Tasks/Responsibilities Support... ...work products. Level III Tasks/Responsibilities Execute... ...Road, Rockville MD Work Site Expectations 4 days in...WebsiteWork at office- ...food scarcity and global health. Job Description The Mechanical Engineer focuses on the design and engineering of HVAC and mechanical... ...under the supervision of the Mechanical Engineer IV include site selection, master planning, commissioning and startup, load calculations...SeniorWebsiteFor subcontractor
- M.C. Dean is seeking a Mechanical Engineer to join their Critical Infrastructure solutions team in McLean, Virginia. This role requires the design... ...mechanical systems, including HVAC and plumbing, performing site surveys, and providing engineering support during...SeniorWebsite
$97.76k - $137.53k
What You'll Do We are seeking a Senior QA tester to join our team! This person will be responsible... ...teams to lead, develop and implement testing strategies specific to Appian... ...professional development Flexible work schedule On-site gym and childcare option Equal...SeniorWebsiteContract workLocal areaImmediate startFlexible hours$145k - $165k
Job Summary The Senior Mechanical Engineer will provide engineering design, evaluation, and planning of mechanical systems. The candidate will have... ...building surveys and document existing HVAC systems and site conditions. Develop system design calculations and selection...SeniorWebsiteFor contractorsFor subcontractorLocal areaRemote work$90k - $150k
Join Affiliated Engineers, Inc. as a Mechanical Engineer II in Rockville, Maryland, where you’ll develop energy-efficient building solutions and design HVAC systems for technically sophisticated facilities. With a strong focus on collaboration and innovation, you’ll benefit...Flexible hours$180k - $220k
...Overview M&J Engineering, D.P.C. (M&J) is a quality... ...and inspection, ITS, mechanical, electrical,... ...M&J is seeking a Senior Engineer and Architect... ...Apply through this site or send resume to recruit... ...designs meet all ADA Title II and Title III standards and guidelines...SeniorWebsiteFull timeFor contractorsLocal area$80.9k - $92.3k
...Senior Administrative Assistant (Administrative Support Assistant III) - HR Compensation Capital One is looking for an exceptionally bright, multitasking, and self... ...tools or other information available through this site. Capital One Financial is made up of several...SeniorWebsiteFull timePart timeWork at officeLocal area- ...engaging with interested candidates in advance. Senior Mechanical Engineer (MEP) Work Location: Rockville, MD 20852... ...failures, performance issues, or non-compliance. Perform site inspections, testing, and data collection; review drawings, specifications,...SeniorWebsiteFull timeTemporary workLocal areaFlexible hours
- ...Description Description: CONTROL SYSTEM ENGINEER III (Baltimore, MD) See Your Future in... ...software components. · Perform system testing, troubleshooting, and debugging to... ...but will also require travel to customer sites/locations to perform analysis, installation...WebsiteWork at officeLocal area
$73.5k - $83.9k
...Senior Administrative Assistant (Administrative Support Assistant III) - Customer Core & Identity Capital One is seeking an exceptionally bright, self-motivated,... ...tools or other information available through this site. Capital One Financial is made up of several...SeniorWebsiteFull timePart timeWork at officeLocal areaImmediate start
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