Senior Mechanical Engineer - Fuel Systems

Senior Mechanical Engineer Quantum Fuel Systems /

Reports to: Senior Vice President, Product Engineering

Location: Lake Forest, CA (onsite at company headquarters)

Employment type: Full-time

FLSA: Exempt

Pay Range: $ - $/year

Quantum Fuel Systems is engineering the future of alternative fuel solutions. For over 25 years, we've been at the forefront of clean energy innovation, designing, developing, and delivering industry-leading storage systems and transport trailers for compressed natural gas (CNG), renewable natural gas (RNG), and hydrogen.

Based in Lake Forest, California
, we're driving clean energy forward by helping our partners meet ambitious net‑zero targets with safe, reliable, and sustainable solutions. Our product line includes next‑generation fuel storage systems for commercial vehicles and virtual pipeline trailers that offer industry‑leading capacity with advanced composite technology.

We are seeking a talented and innovative Sr. Mechanical Engineer / High Pressure Component Specialist to join our team. This role will be pivotal in the development of new products, improvement of existing designs, and support of system design activities. The ideal candidate will have a strong background in mechanical engineering, experience with alternative fuel systems or related industries, and a passion for creating cutting‑edge solutions that advance safety and performance in the alternative fuel sector and gas transportation.

Additionally, this role will involve preparing specifications for hydrogen and CNG vehicle and transportation components and working with internal and external customers to design and configure components for various applications. Design, develop, test, and integrate high‑pressure gaseous fuel components and systems for CNG and Hydrogen automotive, truck, and virtual pipeline applications.

• Lead high-pressure component and system designs.
• Generate and support design activities: DFMEA, ADVP&R, etc.
• Evaluate, select, and qualify supplier products and services.
• Outline and oversee or perform product verification and validation testing.
• Support field services and failure root cause analyses.
• Knowledge of material compatibility issues with hydrogen and natural gas.
• Ability to apply a systematic and logical approach to engineering and design processes.
• Perform analytic calculations, e.g., load and flow calculations.
• Provide technical support and expertise to internal (e.g. operations, manufacturing, sales, service) and external customers.
• Good communication skills, both verbal and written.
• Strong documentation skills; test procedures, test reports, etc.
• Lead and mentor Junior Mechanical Engineers.
• Stay current with industry trends, emerging technologies, and best practices to drive continuous improvement and innovation in design processes.
• Adopt and implement Quantum's Quality Assurance Procedures-QAP and Departmental Work Instructions-DWI.

Bachelor of Science Degree in Mechanical Engineering + 5 years’ experience. Master's degree is a plus.

• Product development with high pressure components in automotive.
• High pressure gaseous (hydrogen, CNG) system design and component selection.
• Developing and implementing test procedures.
• Software: CAD (NX Unigraphics preferred)
• Large modular assemblies design
• Strong understanding of mechanical design principles, materials selection (e.g. knowledge of material compatibility issues with hydrogen and natural gas), and manufacturing processes.
• Knowledge of automotive industry standards and regulations related to alternative fuel systems.
• Strong analytical and problem‑solving skills, attention to detail, and ability to work in a fast‑paced environment.
• Effective communication skills and ability to collaborate with multidisciplinary teams.
• Design for Manufacturing (DFM) concepts.
• Familiar with control plans, FMEA, and GD&T.

This position does not offer visa sponsorship. Candidates must be authorized to work in the United States without the need for employer sponsorship.

The employee will spend some of their time on the production floor. While performing the duties of this job, the employee…