Nuclear Facilities Engineer ; Mechanical HVAC or Electro-Mechanical Engineer

What You Will Do

This position will be filled at either Nuclear Facilities Engineer 2 or 3, depending on the skills of the selected candidate. Additional job responsibilities outlined below will be assigned if the candidate is hired at the higher level. The Plutonium Facilities Engineering Division (PFE-DO) and Plutonium Facilities Engineering CMR and RLUOB (PFE-RCMR) at Los Alamos National Laboratory (LANL) are seeking a Mechanical Engineer.

Put your engineering talents to good use by joining our world‑class Engineering team! Our workforce thrives in an environment that values creativity and problem solving, where every idea and perspective is welcomed. This is your chance to make a real difference while working on important systems directly impacting national security.

In this position, the selected candidate will work collaboratively with junior and senior engineers across multiple disciplines, including fire protection, structural, mechanical, and electrical, to deliver full‑system design solutions. They provide mentorship, technical guidance, and leadership within team settings to ensure high‑quality, integrated project outcomes. They provide support to operations and maintenance groups in regard to equipment operation and maintenance activities.

Engineers in this position serve as subject matter experts in nuclear facility systems engineering, supporting safety, Heating Ventilation Air Conditioning (HVAC), building controls, hydronic systems, and critical infrastructure. Responsibilities include performing equipment failure analyses, and replacement equipment evaluation and recommendations; and contributing to the design of building modifications, room renovations, and new structures. The role also involves developing expertise in pressure safety, piping supports, equipment installation, and the design of piping and HVAC systems.

In addition to what was outlined at the lower level, at this level you will be expected to work independently, act as lead to other engineers and groups, provide mentoring to less‑experienced peers and colleagues, and bring expert‑level technical expertise to the group.

• Demonstrated ability to prepare and review technical reports and studies as part of establishing and maintaining Technical Baseline for new and existing facility structural systems
• Demonstrated ability to define and collect the usage, process, safety, and other requirements for the structure, system, or component design or analysis tasks, and prepare design concepts that meet the requirements
• Demonstrated ability to develop design details, design or analysis calculations, load studies, specifications, and special inspections that incorporate the applicable design requirements, including nuclear safety requirements, as applicable
• Demonstrated experience evaluating and trending system and equipment health/condition
• Demonstrated ability to interface and coordinate with other engineering disciplines and the customer during the development of the design as the Mechanical Subject Matter Expert (SME)
• Demonstrated ability to mentor engineering interns and other engineers

• Demonstrated experience as a mechanical engineer at a major commercial, industrial, or nuclear facility with a strong background in facility related systems (i.e. compressed air, chilled water, vacuum, gases, and chemical systems).
• Demonstrated experience in the design, operation, and maintenance of facility related mechanical systems.
• Demonstrated experience in troubleshooting mechanical systems.
• Demonstrated experience in application of codes and standards in a highly regulated work environment, to include but not limited to the IBC, IEBC, ASHRE, ASME B31.
• Demonstrated experience evaluating and trending system/equipment health/condition.
• Demonstrated ability to perform analysis and calculations required to support engineered solutions.
• Ability to work independently with minimal guidance for assigned tasks and effectively communicate engineering solutions both verbally and…