Mechanical Systems Engineer

Wallingford, CT, 

United States

About the position

This position requires a Mechanical Systems Engineer to apply and demonstrate knowledge of vessel, plumbing, flow-system, and cooling system design and of mass and thermal balance physics in engineered systems.


Product Development

  • Detailed System Performance Modeling/Analysis (flow, temperature, pressure, etc.)
  • Sub-System Design & Component Selection; design for manufacture / design to cost
  • Define specifications for ancillary equipment to support core technology
  • Top level engineering document development (P&ID, PFD, System requirements, System compliance verification, etc.)
  • Manage customization requests to standard products, including documentation re-lease
  • Prototype Test Definition, Build & Test Support
  • Perform FMEA and reliability analyses
  • Support system and customer HAZOP activities

Product support

  • Support Serial Production Unit builds
  • Escalation point for Field Issues
  • Detailed Root Cause Analysis including test protocol development and issue resolution implementation
  • Implement product changes and retrofits based on field feedback

Special projects as required



Bachelor’s degree in Mechanical Engineering or related field

Required skills and abilities

  • 5-10 years of industry related experience (Hydrogen systems (preferred), chemical processing, gas and liquid delivery, or water treatment systems)
  • Demonstration of intimate knowledge of plumbing and HVAC system design and of mass and thermal balance physics in engineered systems
  • Demonstration of experience in selecting and sizing: heat exchangers, pumps, fittings, pressure vessels, fans, controls, 3-phase electricity, drives and understand the governing design codes and standards for those devices
  • Demonstration of experience simplifying designs, reducing costs, and increasing the value of engineered systems
  • Understanding of sub-system operational characteristics and potential interactions that influence overall product/system performance
  • Experience with FMEA and reliability analyses techniques
  • Motivated self-starter with high level of initiative and creative approach to problem solving
  • Ability to manage subsystem developments, including defining requirements and milestones and executing independently
  • Capable of working well in a multi-disciplinary team environment
  • Limited travel could be required to vendor or customer sites

Preferred skills and abilities

  • Commercial products or plant design experience preferred
  • Experience working with electromechanical devices is a plus
  • Strong working knowledge of Microsoft Office; familiarity with ERP is a plus


  • Attention to Detail/Accuracy
  • Problem Solving Skills
  • Communication; verbally and written
  • Time Management; priority goals
  • Consultation
  • Organization and planning
  • Multi-taking
  • Collaboration
  • Ethical Practice


  • Nel will only employ those who are legally authorized to work in the United States.  This is not a position for which sponsorship will be provided.
  • Individuals with temporary visas such as E, F-1, H-1, H-2, L, B, J, or TN or who need sponsorship for work authorization now or in the future, are not eligible for hire.


To apply, please send your cover letter and resumé to

About Nel

Nel is a global, dedicated hydrogen company, delivering optimal solutions to produce, store, and distribute hydrogen from renewable energy. We serve industries, energy, and gas companies with leading hydrogen technology. Our roots date back to 1927, and since then, we have had a proud history of development and continuous improvement of hydrogen technologies. Today, our solutions cover the entire value chain: from hydrogen production technologies to hydrogen fueling stations, enabling industries to transition to green hydrogen, and providing fuel cell electric vehicles with the same fast fueling and long range as fossil-fueled vehicles – without the emissions.

Equal opportunity employer

Nel is an equal opportunity employer and all qualified applicants will receive consideration for employment regardless of race, colour, religion, sex, national origin, disability status, protected veteran status, or any other characteristic protected by law. All employment is decided based on qualifications, merit, and business need.

To download the application form, please click here.

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