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Refinery Process Engineer Jobs in California (NOW HIRING)

Worley

Senior Process Engineer

Monrovia, CA · On-site

$130K - $191K/yr

Senior Process Engineer Worley Group Monrovia, California Summary or Description Worley is hiring a ... On-site and/or in-refinery experience. * Oil and Gas experience. * Saudi Aramco experience.

Worley Alaska

Senior Process Engineer

Monrovia, CA · On-site

$130K - $191K/yr

Senior Process Engineer Worley Group Monrovia, California Summary or Description Worley is hiring a ... On-site and/or in-refinery experience. * Oil and Gas experience. * Saudi Aramco experience.

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Semtech

Process Integration Engineer

Alhambra, CA · On-site

$93K - $135K/yr

The Process Integration Engineer - InP Wafer Fab position is responsible for end-to-end ownership of Indium Phosphide (InP) wafer fabrication process flows supporting the manufacturing of DFB lasers ...

Semtech

Process Integration Engineer

Alhambra, CA · On-site

$93K - $135K/yr

The Process Integration Engineer -InPWafer Fab positionis responsible forend-to-end ownership of Indium Phosphide (InP) wafer fabrication process flows supporting the manufacturing of DFB lasers ...

Oclaro

Staff Wafer Process Engineer

San Jose, CA · On-site

$108K - $155K/yr

Guide process engineers and technicians, promoting a culture of technical excellence and data-driven decision-making. Technical Skills & Qualifications * Deposition Expertise: In-depth knowledge of ...

Nokia

PIC Process Integration Engineer

Sunnyvale, CA · On-site

Work closely with process engineers and other internal stakeholders to meet process and equipment milestones. Process Development & Integration : Develop and optimize process modules (etch ...

Applied Medical

Process Engineer

Lake Forest, CA · On-site

$71K - $80K/yr

... refine how products are made, the Process Engineer role offers an exciting opportunity to make scalable impact in medical manufacturing. Benefits * Competitive compensation range: $71,000 - $80,000 ...

Applied Medical

Process Engineer

Lake Forest, CA · On-site

$71K/yr

... refine how products are made, the Process Engineer role offers an exciting opportunity to make scalable impact in medical manufacturing. Benefits * Competitive compensation range: $71,000 - $80,000 ...

Applied Medical

Process Engineer

Lake Forest, CA

$71K - $80K/yr

... refine how products are made, the Process Engineer role offers an exciting opportunity to make scalable impact in medical manufacturing. Benefits * Competitive compensation range: $71,000 - $80,000 ...

Worley

Process Engineer Level II

Monrovia, CA · On-site

$110K - $162K/yr

You will provide process engineering services and leadership projects to Worley' and its customers ... Experience in refining, petrochemical, or upstream facilities with complex relief systems.

Worley Alaska

Process Engineer Level II

Monrovia, CA · On-site

$110K - $162K/yr

You will provide process engineering services and leadership projects to Worley' and its customers ... Experience in refining, petrochemical, or upstream facilities with complex relief systems.

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All JobsRefinery Process Engineer JobsRefinery Process Engineer Jobs in California

Refinery Process Engineer information

See California salary details

$70.6K

$135.6K

$229.9K

How much do refinery process engineer jobs pay per year?

As of Aug 16, 2026, the average yearly pay for refinery process engineer in California is $135,586.00, according to ZipRecruiter salary data. Most workers in this role earn between $100,200.00 and $145,600.00 per year, depending on experience, location, and employer.

What does a refinery process engineer do?

A Refinery Process Engineer is responsible for designing, optimizing, and troubleshooting processes within an oil refinery to ensure efficiency, safety, and regulatory compliance. They analyze data, monitor equipment performance, and recommend improvements to enhance productivity and reduce costs. Additionally, they work closely with operations, maintenance, and safety teams to implement process modifications and resolve technical issues. Their role is crucial in maximizing yield, minimizing energy consumption, and ensuring environmental compliance.

What are some of the typical day-to-day responsibilities for a refinery process engineer?

As a Refinery Process Engineer, your main responsibilities typically include monitoring and optimizing production processes, troubleshooting technical issues, and ensuring compliance with safety and environmental regulations. You may also be involved in analyzing process data, implementing improvements, and coordinating with operations, maintenance, and other engineering teams to maintain efficient plant performance. Your day could involve both desk work—such as process modeling and reporting—and fieldwork in the refinery, observing equipment and working closely with plant personnel. This blend of tasks helps ensure the refinery operates safely, efficiently, and at peak capacity.

What are the key skills and qualifications needed to thrive as a refinery process engineer, and why are they important?

To excel as a Refinery Process Engineer, a strong background in chemical engineering, process optimization, and safety protocols is essential, typically supported by a relevant engineering degree. Proficiency with process simulation software (such as Aspen HYSYS or CHEMCAD), knowledge of distributed control systems (DCS), and familiarity with industry certifications like Six Sigma or Professional Engineer (PE) licensure are highly valued. Problem-solving abilities, strong communication, and teamwork skills help professionals navigate dynamic refinery environments and coordinate with cross-functional teams. These competencies are crucial for ensuring efficient, safe, and compliant operations within complex refinery processes.

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Refinery Process Engineer jobs near you
Infographic showing various Refinery Process Engineer job openings in California as of August 2026, with employment types broken down into 1% As Needed, 78% Full Time, 15% Part Time, 2% Temporary, 3% Contract, and 1% Nights. Highlights an 92% Physical, 2% Hybrid, and 6% Remote job distribution, with an average salary of $135,586 per year, or $65.2 per hour.

Senior Process Engineer

Worley

Monrovia, CA • On-site

$130K - $191K/yr

Full-time

Medical, Dental, Vision, Retirement, PTO

Re-posted 28 days ago

Worley rating

8.0

Company rating: 8.0 out of 10

Based on 31 frontline employees who took The Breakroom Quiz

208th of 449 rated engineering

Job description

About us
Worley is a global company of energy, chemicals and resources experts headquartered in Australia. We partner with our customers to deliver projects and create value across the life of their assets. We specialize in consulting, engineering, procurement and construction across the project lifecycle, with services extending through to operations and decommissioning. Leveraging extensive experience and AI-enabled delivery, we support customers in navigating complexity as they meet today's needs and transition to more sustainable solutions.
Senior Process Engineer
Worley Group
Monrovia, California
Summary or Description
Worley is hiring a Senior Process Engineer to join our team in Monrovia, CA. As a global professional services company in the energy, chemicals, and resources sectors, Worley is helping bridge the transition to more sustainable energy solutions while continuing to deliver the resources the world depends on today.
Purpose:
You will provide process engineering services to Worley and its customers, including technical support and supervision within the process engineering team.
Responsibilities:
  • The overall supervision of the Process discipline work on a project.
  • Technical direction, advice, and control of the Process work.
  • Liaison with client discipline representatives to establish technical direction where not provided by codes & standards.
  • Scope definition, estimation, and progress control of the Process engineering activities.
  • Planning of man hour budgets, schedules, manpower loadings and staffing requirements, by skill and experience, to satisfy project requirements and direction given by the Engineering Manager.
  • Co-ordination of Process engineering design and drafting.
  • Complete complex process design activities including simulation.
  • Liaison with other discipline Lead engineers on technical issues and engineering matters.
  • Assisting asset/client Lead Project Engineers in the definition of the Process engineering work in any project, design approach and criteria, procedures for engineering work and timely production of deliverables.
  • Co-ordination and preparation of input to Essential Process Documents, as defined by the client/ contract. Where responsibility for updating the Master Documents is handed to the Lead Process Engineer, procedures shall be put in place to maintain document integrity.

What you will bring
Technical/Industry Experience and Qualifications Requirements:
  • Highly effective technical and practical engineering skills and ability to consistently deliver quality, accurate and timely work to Worley and its customers.
  • A sound knowledge of the fundamental requirements of the process of engineering, and the basic requirements of other engineering fields.
  • A sound knowledge of applicable local and international standards and statutory and regulatory requirements.
  • Competent use of process engineering specific software.
  • Competent use of relevant software such as MS Office Suite.
  • Substantial technical land practical experience in process engineering in the same or similar industry including experience in working in multi-disciplinary projects and teams.
  • Proven leadership skills.
  • Expert knowledge of process simulation packages such as HYSYS or PRO 11.
  • 8 plus years' experience.
  • On-site and/or in-refinery experience.
  • Oil and Gas experience.
  • Saudi Aramco experience.

Additional Information:
  • This position is in California.
  • Salary Range $130,356-$191,703.
  • Benefits: eligible for PTO, 401k, medical, vision, dental, etc.

Los Angeles
We will consider for employment all qualified Applicants, including those with Criminal Histories, in a manner consistent with the requirements of applicable state and local laws, including the City of Los Angeles' Fair Chance Initiative for Hiring Ordinance." #LI-AC1
Education - Qualifications, Accreditation, Training:
Required:
  • Bachelor's degree or master's degree in chemical Engineer or related field or equivalent.

Preferred:
  • Experience in petrochemical and refining with project design, execution, construction.

Moving forward together
We want our people to be energized and empowered to drive sustainable impact. So, our focus is on a values-inspired culture that unlocks brilliance through belonging, connection and innovation. We're building a diverse, inclusive and respectful workplace. Creating a space where everyone feels they belong, can be themselves, and are heard.
And we're not just talking about it; we're doing it. We're reskilling our people, leveraging transferable skills, and supporting the transition of our workforce to become experts in today's low carbon energy infrastructure and technology. Whatever your ambition, there's a path for you here.
And there's no barrier to your potential career success. Join us to broaden your horizons, explore diverse opportunities, and be part of delivering sustainable change.

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