JobsMechanical EngineerUnited StatesMechanical Engineer II

Mission Support & Test Services, LLC (MSTS)

Posted 6 days ago · Jobs at Mission Support & Test Services, LLC (MSTS)

Mechanical Engineer II

Mission Support & Test Services, LLC (MSTS) · Mercury, Nevada, United States

Full-timeOn site2-5 yrs$83k–$125kListed as no visa sponsorshipGovernment Administration
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In short

The Mechanical Engineer II is responsible for maintaining facility systems, providing engineering support for operations, and ensuring system operational readiness. They will also manage configuration documentation, conduct inspections, and coordinate technical activities with internal departments and outside vendors.

What they're looking for

MUST-HAVE SKILLS

Systems engineeringMechanical engineeringConfiguration managementTechnical surveillanceDesign analysisProcurementTechnical writingInstrumentation and control

ALSO MENTIONED

Mechanical EngineerSystems EngineeringNNSSNNSAConfiguration ManagementSafety BasisIn-service-InspectionTechnical SurveillanceDOE Q ClearanceNuclear Security

Candidates must hold a bachelor's degree in an ABET-accredited engineering program or a calculus-based STEM degree, along with at least 2 years of relevant experience. Applicants must also be able to obtain and maintain a DOE Q-level security clearance, which requires U.S. citizenship.

About the employer

Mission Support and Test Services, LLC

hiring as Mission Support & Test Services, LLC (MSTS)

Mission Support and Test Services is a dynamic team of experts and leaders from Honeywell International Inc., Amentum, and Stoller Newport News Nuclear, Inc. – a subsidiary of Huntington Ingalls Industries selected by the National Nuclear Security Administration as the Management and Operating Contractor for the Nevada National Security Site.

Read more

MSTS is supported by our small business subcontractors, OpEx Group LLC and VisX Corporation.

INDUSTRY
Government Administration
COMPANY
Partnership
HEADQUARTERS
North Las Vegas, NV
SIZE
1,001-5,000on LinkedIn
OFFICES
1 on LinkedIn
OPEN HERE
2 roles

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Questions about this role

Is this Mission Support & Test Services, LLC (MSTS) role remote?
Tagged on site.
What does it pay?
The posting lists $83,075–$124,613 a year.
Does it sponsor visas?
Listed as no visa sponsorship.
What experience does it ask for?
Listed as 2-5 years.

The posting, in full

Mission Support and Test Services, LLC (MSTS) manages and operates the Nevada National Security Site (NNSS) for the U.S. National Nuclear Security Administration (NNSA). Our MISSION is to help ensure the security of the United States and its allies by providing high-hazard experimentation and incident response capabilities through operations, engineering, education, field, and integration services and by acting as environmental stewards to the Site’s Cold War legacy. Our VISION is to be the user site of choice for large-scale, high-hazard, national security experimentation, with premier facilities and capabilities below ground, on the ground, and in the air. (See NNSS.gov for our unique capabilities.) Our 2,750+ professional, craft, and support employees are called upon to innovate, collaborate, and deliver on some of the more difficult nuclear security challenges facing the world today.

▶ READ THE FULL POSTING

Mission Support and Test Services, LLC (MSTS) manages and operates the Nevada National Security Site (NNSS) for the U.S. National Nuclear Security Administration (NNSA). Our MISSION is to help ensure the security of the United States and its allies by providing high-hazard experimentation and incident response capabilities through operations, engineering, education, field, and integration services and by acting as environmental stewards to the Site’s Cold War legacy. Our VISION is to be the user site of choice for large-scale, high-hazard, national security experimentation, with premier facilities and capabilities below ground, on the ground, and in the air. (See NNSS.gov for our unique capabilities.) Our 2,750+ professional, craft, and support employees are called upon to innovate, collaborate, and deliver on some of the more difficult nuclear security challenges facing the world today.

  • MSTS offers our full-time employees highly competitive salaries and benefits packages including medical, dental, and vision; both a pension and a 401k; paid time off and 96 hours of paid holidays; relocation (if located more than 75 miles from work location); tuition assistance and reimbursement; and more.
  • MSTS is a limited liability company consisting of Honeywell International Inc. (Honeywell), Jacobs Engineering Group Inc. (Jacobs), and HII Nuclear Inc.

Responsibilities

Performs duties as a facility/system engineer (Mechanical Engineer II) at the Device Assembly Facility (DAF) within the MSTS Stockpile Experimentation & Operations Directorate. The DAF is located within the forward areas of the NNSS.

Key Responsibilities

  • Responsible for maintaining overall cognizance of assigned facility systems, providing systems engineering support for operations and maintenance, and technical support of line management safety responsibilities for ensuring continued system operational readiness.
  • Validates physical configuration of assigned systems. Maintains and updates system documents for Configuration Management (CM). Understands the functions and performance criteria for assigned systems per the Safety Basis, and acts as the subject matter expert for assigned systems.
  • Conducts or oversees the In-service-Inspection and Technical Surveillance Requirement execution of assigned systems.
  • Contribute to solutions of assignment-related problems and issues with a moderate scope and of moderate complexity, using a well-defined set of technologies. Solutions use established basic standards, practices and procedures as well as technical knowledge to address problems and complete tasks. Solutions may require evaluation of standards and processes.
  • Participate in developing field programs and designs using pre-determined principles and practices.
  • Select and implement computer applications for their field.
  • Prepare or contribute to designs, strategies, reports and technical proposals.
  • Perform design and technical analysis activities using prescribed codes and standards, computer software, and generally accepted best management practices.
  • Perform frequent coordination of discipline information with other departments within the company and with outside vendors.
  • Work with outside vendors as required, obtaining relevant information.
  • Develop a working knowledge of codes and standards of other disciplines.
  • Coordinate work within their discipline on moderately complex projects.
  • Often serves as a member of work teams.
  • Define specifications for procurements and initiates purchase requests.
  • Monitor work of skilled technicians and other support personnel.

Qualifications

  • Bachelor’s degree in an engineering program accredited by the Accreditation Board for Engineering and Technology (ABET) required for Civil, Mechanical and Electrical engineering degrees
  • Or, Calculus-based STEM bachelor’s degree in engineering
  • Or, for Architects, Certification from the National Council or Architectural Registration Board (NCARB)
  • Or Professional Engineer license
  • Plus at least 2 years’ relevant experience. Skill building experience must demonstrate either deeper technical specialization or additional cross-disciplinary knowledge; graduate research experience may be recognized.
  • Ability to interpret codes and standards applicable to the position.
  • Demonstrated desire to learn and innovate.
  • Demonstrated ability to follow instructions and procedures.
  • Knowledge of instrumentation & control, electrical, mechanical or electromechanical components.
  • Should be self-motivated and able to complete assigned tasks with minimal supervision.
  • Ideally, the applicant will have strong time-management skills. Be well organized, maintain safe work habits and have a broad range of technical interests and education.
  • Excellent oral and written communication skills, including the ability to write reports and technical documents.
  • Ability to interpret codes and standards within the discipline in which they were hired.
  • The primary work location will be in the forward area of the NNSS (approximately 80 miles northwest of Las Vegas, Nevada).
  • Work schedule for this position will be 4/10s, Monday – Thursday (subject to change).
  • Pre-placement physical examination, which includes a drug screen, is required. MSTS maintains a substance abuse policy that includes random drug testing.
  • Must possess a valid driver’s license.

MSTS is required by DOE directive to conduct a pre-employment drug test and background review that includes checks of personal references, credit, law enforcement records, and employment/education verifications. Applicants offered employment with MSTS are also subject to a federal background investigation to meet the requirements for access to classified information or matter if the duties of the position require a DOE security clearance. Substance abuse or illegal drug use, falsification of information, criminal activity, serious misconduct or other indicators of untrustworthiness can cause a clearance to be denied or terminated by DOE, resulting in the inability to perform the duties assigned and subsequent termination of employment. In addition, Applicants for employment must be able to obtain and maintain a DOE Q-level security clearance, which requires U.S. citizenship, at least 18 years of age. Reference DOE Order 472.2, “Personnel Security”. If you hold more than one citizenship (i.e., of the U.S. and another country), your ability to obtain a security clearance may be impacted.

Department of Energy Q Clearance (position will be cleared to this level). Reviews and tests for the absence of any illegal drug as defined in 10 CFR Part 707.4, “Workplace Substance Abuse Programs at DOE Sites,” will be conducted. Applicant selected will be subject to a Federal background investigation, required to participate in subsequent reinvestigations, and must meet the eligibility requirements for access to classified matter. Successful completion of a counterintelligence evaluation, which may include a counterintelligence-scope polygraph examination, may also be required. Reference 10 CFR Part 709, “Counterintelligence Evaluation Program.”

MSTS is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, national origin, disability, veteran status or other characteristics protected by law. MSTS is a background screening, drug-free workplace.

Annual salary range for this position is: $83,075.20 - $124,612.80.

Starting salary is determined based on the position market value, the individual candidate education and experience and internal equity.

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This listing comes from Mission Support & Test Services, LLC (MSTS)'s own careers site. Apply links go to the employer. Company facts are from Mission Support and Test Services, LLC's public profile. Last checked 5 Nov 2026.