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Junior Mechanical Engineering Jobs in Riverside, CA

Senior Mechanical Engineer

Irvine, CA

$112K - $148K/yr

  • Medical

  • Dental

  • Vision

  • Retirement

  • PTO

Manage engineering projects, including defining project scope, timelines, and resources. Ensure ... Provide guidance and mentorship to junior engineers, sharing expertise and promoting best practices ...

Mechanical Engineer II

Irvine, CA ยท On-site

$40.01 - $64.90/hr

  • Medical

  • Dental

  • Vision

  • Retirement

Mechanical Engineer II Full-time Irvine, CA, US Exclusive confidential search -- details shared ... Provide direction or guidance to junior engineers, designers, and drafters as needed * Collaborate ...

Senior Mechanical Engineer

Orange, CA

$111K - $147K/yr

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

  • PTO

Mentor and teach junior engineers. Grow your career with us in our Building+ Places group. The Senior Mechanical Engineer will be responsible for the following but not limited to; * Design of heating ...

Senior Mechanical Engineer

Orange, CA ยท On-site

$111K - $147K/yr

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

  • PTO

Mentor and teach junior engineers. Grow your career with us in our Building+ Places group. The Senior Mechanical Engineer will be responsible for the following but not limited to; * Design of heating ...

Senior Mechanical Engineer

Orange, CA ยท On-site

$111K - $147K/yr

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

  • PTO

Mentor and teach junior engineers. Grow your career with us in our Building+ Places group. The Senior Mechanical Engineer will be responsible for the following but not limited to; * Design of heating ...

Senior Mechanical Engineer - Buildings

Riverside, CA ยท On-site

$100.80 - $147/hr

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

  • PTO

Mentor junior staff and contribute to team development Who You Are Required Qualifications * Bachelor's Degree in Mechanical Engineering or Architectural Engineering * 5+ years of relevant experience ...

Senior Mechanical Engineer - Buildings

Irvine, CA ยท On-site

$107.50 - $156.60/hr

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

  • PTO

Mentor junior staff and contribute to team development Who You Are Required Qualifications * Bachelor's Degree in Mechanical Engineering or Architectural Engineering * 5+ years of relevant experience ...

Mechanical Engineer

Irvine, CA ยท On-site

$80K - $110K/yr

  • Medical

  • Dental

  • Vision

  • Retirement

  • PTO

Provide engineering design, evaluation, and planning of mechanical systems for a variety of market ... Oversee and provide guidance to junior engineers * Lead project teams and serve as the primary ...

Sr. Mechanical Engineer

Pomona, CA ยท On-site

$121K - $148K/yr

  • Medical

  • Dental

  • Vision

  • Retirement

Bachelor's degree in mechanical engineering or equivalent and 4+ years of Mechanical Engineering ... Experience mentoring/coaching junior engineers * Proficient with electro-mechanical systems design ...

Sr. Mechanical Engineer

Pomona, CA ยท On-site

$121K - $148K/yr

  • Medical

  • Dental

  • Vision

  • Retirement

Bachelor's degree in mechanical engineering or equivalent and 4+ years of Mechanical Engineering ... Experience mentoring/coaching junior engineers * Proficient with electro-mechanical systems design ...

Sr. Mechanical Engineer

Pomona, CA ยท On-site +1

$121K - $148K/yr

  • Medical

  • Dental

  • Vision

  • Retirement

Bachelor's degree in mechanical engineering or equivalent and 4+ years of Mechanical Engineering ... Experience mentoring/coaching junior engineers * Proficient with electro-mechanical systemsdesign ...

Engineering duties will span the entire product lifecycle, from initial design and requirements ... Act as a mentor to more junior engineers. Required Competencies Education/Experience Bachelor of ...

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Showing results 1-20

Junior Mechanical Engineering information

See Riverside, CA salary details

$42.8K

$76.3K

$102.2K

How much do junior mechanical engineering jobs pay per year?

As of Aug 17, 2026, the average yearly pay for junior mechanical engineering in Riverside, CA is $76,306.00, according to ZipRecruiter salary data. Most workers in this role earn between $66,200.00 and $86,100.00 per year, depending on experience, location, and employer.

What does a junior mechanical engineer do?

A Junior Mechanical Engineer assists in designing, developing, and testing mechanical devices and systems under the supervision of senior engineers. Their responsibilities often include creating technical drawings, performing basic calculations, supporting prototype development, and helping to solve engineering problems. They also collaborate with other team members to ensure projects meet specifications and deadlines. This role typically serves as an entry-level position, providing valuable hands-on experience and professional development within the mechanical engineering field.

What are the key skills and qualifications needed to thrive as a junior mechanical engineer?

To thrive as a Junior Mechanical Engineer, you need a solid understanding of mechanical engineering principles, a relevant engineering degree, and foundational knowledge of design and manufacturing processes. Familiarity with CAD software (such as SolidWorks or AutoCAD), simulation tools, and basic project management systems is typically required. Strong problem-solving abilities, attention to detail, and effective teamwork and communication skills help you excel in cross-functional environments. These skills are crucial for delivering accurate designs, collaborating efficiently, and supporting successful project outcomes in engineering teams.

What types of projects do junior mechanical engineers typically work on, and how much autonomy can I expect in this role?

As a Junior Mechanical Engineer, you will often be involved in supporting senior engineers with tasks such as drafting designs, conducting simulations, preparing technical documentation, and performing tests on prototypes. Early in your career, you'll typically work within a multidisciplinary team, collaborating with experienced engineers and other departments such as manufacturing and quality assurance. While you may start with closely supervised assignments, many organizations encourage gradual independence as you demonstrate your skills and reliability. Over time, you will likely take on more complex project components and gain opportunities to lead smaller tasks or initiatives.

What is the difference between Junior Mechanical Engineering vs Mechanical Design Engineer?

AspectJunior Mechanical EngineeringMechanical Design Engineer
Required CredentialsBachelor's in Mechanical Engineering or related fieldBachelor's or higher in Mechanical Engineering or Design
Work EnvironmentEntry-level, team-based projects, manufacturing or R&D settingsDesign-focused tasks, CAD software, product development teams
Employer & Industry UsageManufacturing, automotive, aerospace, HVACProduct design, engineering firms, industrial equipment

Junior Mechanical Engineers typically perform basic engineering tasks under supervision, focusing on learning and supporting projects. Mechanical Design Engineers concentrate on creating and refining product designs using CAD tools, often requiring more specialized design skills. While both roles require a mechanical engineering background, the Design Engineer role emphasizes design and development, whereas the Junior Mechanical Engineer role is more about supporting engineering processes and gaining experience.

What are the most commonly searched types of Mechanical Engineering jobs in Riverside, CA?

The most popular types of Mechanical Engineering jobs in Riverside, CA are:

What are popular job titles related to Junior Mechanical Engineering jobs in Riverside, CA?

For Junior Mechanical Engineering jobs in Riverside, CA, the most frequently searched job titles are:

What job categories do people searching Junior Mechanical Engineering jobs in Riverside, CA look for?

The top searched job categories for Junior Mechanical Engineering jobs in Riverside, CA are:

What cities near Riverside, CA are hiring for Junior Mechanical Engineering jobs?

Cities near Riverside, CA with the most Junior Mechanical Engineering job openings:

Infographic showing various Junior Mechanical Engineering job openings in Riverside, CA as of August 2026, with employment types broken down into 85% Full Time, 10% Part Time, 4% Contract, and 1% Nights. Highlights an 87% Physical, 3% Hybrid, and 10% Remote job distribution, with an average salary of $76,306 per year, or $36.7 per hour.

Senior Mechanical Engineer - Fuel Systems

Quantum Fuel Systems LLC

Lake Forest, CA โ€ข On-site

$120K - $140K/yr

Full-time

Medical, Dental, Vision, Life, Retirement, PTO

Posted 5 days ago


Job description

Senior Mechanical Engineer

Quantum Fuel Systems / www.qtww.com

Reports to: Senior Vice President, Product Engineering

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

Employment type: Full-time

FLSA: Exempt

Pay Range: $120,000.00 - $140,000.00/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 / Fuel Systems Engineering 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.

Requirements

  • 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.

Education and Experience:

Required:

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

Preferred:

  • 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.

Physical Job Requirements:

The employee will spend some of their time on the production floor. While performing the duties of this job, the employee may be required to stand for long periods of time, kneel, and crouch. In the office, the employee is regularly required to use their hands and fingers to operate a computer keyboard, mouse, and telephone keypad or to write, as well as talk and hear. Specific vision abilities required by this job include close vision, distance vision, peripheral vision, depth perception and ability to focus. This position involves occasionally lifting to 40 pounds.

EQUAL EMPLOYMENT OPPORTUNITY & AMERICANS WITH DISABILITIES ACT

Quantum Fuel Systems is an equal opportunity employer committed to fostering a diverse, inclusive, and accessible workplace. We celebrate diversity and are dedicated to creating an environment where all employees can thrive.

All qualified applicants will receive consideration for employment without regard to race, color, religion, sex (including pregnancy, childbirth, breastfeeding, and related medical conditions), sexual orientation, gender identity, gender expression, national origin, ancestry, citizenship status, uniform service member and veteran status, marital status, pregnancy, age, protected medical condition, genetic information, disability, or any other characteristic protected by applicable federal, state, or local law.

In accordance with the Americans with Disabilities Act (ADA) and applicable state and local laws, Quantum Fuel Systems provides reasonable accommodations to qualified individuals with disabilities in all aspects of employment, including the application and interview process. If you require a reasonable accommodation to perform the essential functions of a job or to participate in the application process, please contact Human Resources at hr@qtww.com so that we may engage in the interactive process to identify an appropriate accommodation.

We will consider qualified applicants with criminal histories in a manner consistent with the requirements of the Los Angeles Fair Chance Ordinance and San Francisco Fair Chance Ordinance where applicable.

Benefits

Benefits - What We Offer:

    • Comprehensive Health Coverage – Choose from 2 HMO or 2 PPO medical plans, plus dental, vision, and life insurance
    • Financial Benefits – 401(k) with company match and Flexible Spending Accounts (FSA)
    • Paid Time Off – Vacation, sick leave, and company holidays