Mechanical Design Engineer III

Nikkiso Co.; Escondido (CA); Hybrid; USD 84,000 - 154,000; Full time

Job summary

Nikkiso Clean Energy & Industrial Gases in Escondido, CA is seeking a Mechanical Engineer III to support cryogenic and high‑pressure system design, sizing, and piping layouts. You will work closely with engineering, manufacturing and field teams in a hands-on, on-site environment.

The role requires project management, timely documentation, and adherence to design codes, with duties spanning valve sizing, PSV sizing, thermodynamic analyses, and system validation. Travel up to 25% may be required.

Qualifications

• Bachelor's Degree in Mechanical Engineering (required or equivalent).
• Experience with fluid transfer systems and pressure relief sizing.
• Ability to read and develop P&ID diagrams.
• Familiarity with pump selection and operation.
• Knowledge of engineering design codes for piping and pressure vessels.
• Proficiency with CAD software (AutoCAD/Inventor/SolidWorks).

Responsibilities

• Provide mechanical design for cryogenic and high‑pressure systems.
• Meet key performance indicators and complete contractual obligations on schedule and within budget.
• Collaborate with engineering, manufacturing and field teams.
• Perform thermodynamic and pipe flow calculations.
• Support field start-up, commissioning, and on-site troubleshooting.

Skills

Fluid transfer systems knowledge

P&ID reading & development

Pump selection & operation

HAZOP/HAZID/What-If risk assessment

CAD software: AutoCAD

CAD software: Inventor

CAD software: SolidWorks

Education

Bachelor's Degree in Mechanical Engineering

Master's Degree in Mechanical Engineering

Tools

AutoCAD

Inventor

SolidWorks

Job description

Company Overview

Nikkiso Clean Energy & Industrial Gasesis a leading provider of high pressure and cryogenic systems, cryogenic pumps, heat exchangers, process systems, turboexpanders, and services for liquefied natural gas (LNG), liquefied hydrogen (LH2), compressed natural gas (CNG), compressed hydrogen (GH2) and industrial gases (LN2, LAr, LO2) industries. Applications include fueling stations, trailer loading systems, marine fuel system, LNG peak shaving, power generation, and virtual pipelines.

We are a subsidiary of Nikkiso Company Ltd, a leading industrial manufacturer headquartered in Tokyo, Japan, with $1.5 B USD in annual revenue, 8000 + employees worldwide, and publicly traded on the Tokyo Stock Exchange.

Job Overview

We are currently looking for a Mechanical Engineer III for our Nikkiso Applied Technology business unit in Escondido, CA. The ideal candidate will assist with mechanical calculations such as valve sizing, PSV sizing, pump/compressor sizing, pipe stress, flow modeling and mechanical design such as P&IDs, piping isometrics, pump skid design and trailer loading skid designs. The position will require some project management as well that includes interfacing with the customer, providing schedule updates, and submitting all required project documentation. Typical projects involve cryogenic transfer systems and high pressure (20,000 psig) gas transfer systems. This is an in-person, on-site role that emphasizes direct collaboration with engineering, manufacturing, and field teams. Remote or hybrid work is not available.

Salary Range:

$83,821 To $153,600 Per Year

Responsibilities

Reasonable accommodation may be made to enable individuals with disabilities to perform the essential functions.

• Provide mechanical engineering design of cryogenic and high-pressure system.
• Ability to meet key performance indicators, including completing all contractual obligations on schedule and within budget.
• Ability to work in team environment
• Application of Engineering Design Codes, including but not limited to piping system design code and pressure vessel design codes.
• Responsible for component selection.
• Perform thermodynamic and pipe flow calculations.
• Support field start-up and commissioning activities, including on-site troubleshooting, system validation, and collaboration with operations and service teams.

Qualifications

• Bachelor's Degree in Mechanical Engineering with 2 years experience or Masters' degree in Mechanical Engineering
• Fluid transfer system knowledge (pump selection, pipe flow calculations, relief valve sizing)
• Ability to read and develop P&ID
• Familiarity with P&IDs
• Familiarity with pump selection and pump operations
• Working knowledge of system safety and risk assessment techniques (HAZOP, HAZID, What-If) and their integration into mechanical design and design reviews
• Proficiency with AutoCAD, Inventor, or SolidWorks or similar software
• Required Travel: Up to 25%

Preferred Experience

• Masters' degree in Mechanical Engineering

• Cryogenic system design, fabrication, and start-up experience
• High pressure system design, fabrication, and start-up experience
• 5+ years of related experience in cryogenic or high-pressure systems
• Startup and Commissioning Experience
• System Control Narrative Development
• Centrifugal and positive displacement pump system selection and integration

EEOC Statement

Nikkiso is proud to be an equal opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, or protected veteran status and will not be discriminated against on the basis of disability.