1

Junior Chemical Process Engineer Jobs in California

Chemical Process Engineer

Carson, CA ยท On-site

$107 - $184/hr

Chemical Process Engineer - Must have Gas/Oil Refinery Experience Job Summary The Los Angeles Marathon Refinery located in Carson, California has an opening for an experienced Chemical Process ...

Posted today

Senior Chemical Process Engineer

Vista, CA ยท On-site

$137K - $193K/yr

As the Senior Chemical Process Engineer, you will stand up the sol-gel infusion and resin injection manufacturing processes at the heart of our thermal protection system production, carrying them ...

Process Engineer, Chemical

Livermore, CA ยท On-site

$105K - $130K/yr

Responsible for all chemical process engineering with a focus on chemical clean processes. * Responsible for ultrasonic cleaning process engineering. * Develop/maintain detailed process routings ...

... junior team members Background: * 4-8 years in process engineering, ideally downstream ... Chemical engineering degree is a plus. Comfortable in an outdoor production environment and with ...

Jr. Process Engineer

San Jose, CA ยท On-site

$95K - $120K/yr

The Process Engineer is responsible for learning, understanding, and monitoring all processes in ... Perform chemical lab analysis as assigned by the manager or as needed to verify the chemical ...

next page

Showing results 1-20

Junior Chemical Process Engineer information

See California salary details

$33.1K

$70.9K

$108.1K

How much do junior chemical process engineer jobs pay per year?

As of Aug 24, 2026, the average yearly pay for junior chemical process engineer in California is $70,859.00, according to ZipRecruiter salary data. Most workers in this role earn between $47,900.00 and $79,000.00 per year, depending on experience, location, and employer.

What does a junior chemical process engineer do?

A Junior Chemical Process Engineer assists in designing, developing, and optimizing processes used in the production of chemicals, fuels, foods, pharmaceuticals, and other products. They work under the supervision of senior engineers to ensure that processes run efficiently, safely, and cost-effectively. Their responsibilities often include data analysis, troubleshooting equipment, conducting experiments, and supporting process improvements. Junior engineers also help maintain compliance with industry regulations and environmental standards as they gain experience in the field.

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

A Junior Chemical Process Engineer typically needs a bachelor's degree in chemical engineering, a solid understanding of process design, and knowledge of chemical safety standards. Familiarity with process simulation software (such as Aspen Plus or HYSYS), and experience with data analysis tools are commonly required. Strong problem-solving skills, effective communication, and the ability to work well in multidisciplinary teams help set candidates apart. These skills are crucial for optimizing processes, ensuring safety and compliance, and contributing effectively to engineering projects.

What are some common challenges faced by junior chemical process engineers during their first year, and how can they be addressed?

Junior Chemical Process Engineers often encounter challenges such as adapting to complex plant operations, understanding safety protocols, and bridging the gap between theoretical knowledge and practical application. To overcome these, it's helpful to seek mentorship from experienced engineers, proactively ask questions, and participate in hands-on training sessions. Building strong communication skills and collaborating closely with multidisciplinary teams can also ease the transition and accelerate learning.

What is the difference between Junior Chemical Process Engineer vs Chemical Process Technician?

AspectJunior Chemical Process EngineerChemical Process Technician
Required CredentialsBachelor's degree in Chemical Engineering or related fieldAssociate degree or technical certification in chemical technology
Work EnvironmentDesign, analysis, and process optimization in labs or plant officesHands-on operation and maintenance in manufacturing plants
Employer & Industry UsageUsed by engineering firms, manufacturing companies, and R&D labsCommon in production facilities and plant operations
Common Search & ComparisonOften compared for entry-level engineering rolesCompared for technical, operational roles in chemical plants

The Junior Chemical Process Engineer typically holds a bachelor's degree and focuses on designing and optimizing chemical processes, working in labs or offices. In contrast, a Chemical Process Technician usually has technical certifications and is involved in hands-on operation and maintenance within manufacturing plants. Both roles are essential in the chemical industry but differ in responsibilities, qualifications, and work environment.

What cities in California are hiring for Junior Chemical Process Engineer jobs?

Cities in California with the most Junior Chemical Process Engineer job openings:

Infographic showing various Junior Chemical Process Engineer job openings in California as of August 2026, with employment types broken down into 1% As Needed, 83% Full Time, 13% Part Time, 2% Contract, and 1% Nights. Highlights an 91% Physical, 3% Hybrid, and 6% Remote job distribution, with an average salary of $70,859 per year, or $34.1 per hour.

Chemical Process Engineer

drive for MPC

Carson, CA โ€ข On-site

$107 - $184/hr

Other

Medical, Dental, Vision, Retirement, PTO

Posted 10 hours ago

Posted today


Job description

An exciting career awaits you At MPC, we're committed to being a great place to work - one that welcomes new ideas, encourages diverse perspectives, develops our people, and fosters a collaborative team environment. Chemical Process Engineer - Must have Gas/Oil Refinery Experience

Job Summary The Los Angeles Marathon Refinery located in Carson, California has an opening for an experienced Chemical Process Engineer who will provide technical support for plant operations. They will be assigned a specific unit or units within the Refinery with responsibilities of daily monitoring and troubleshooting of their areas, process optimization, and design and development of capital projects as well as major modifications to existing units. Process Engineers will apply state-of-the-art technology with regard to process simulation and optimization, recommend programs and procedures to increase the economic efficiency of refining operations, and work in a team environment with line operators and other engineers to maintain and troubleshoot control system problems as well as develop advanced control applications for their process units. Available onsite schedule is a 9/80's. Must provide occasional after-hours support and support TAR approximately once a year.

Key ResponsibilitiesAREA TEAM SUPPORT
  • Communicate unit performance, optimization opportunities, and environmental performance.
  • Assist troubleshooting efforts with unit upsets, product quality incidents, not meeting production plans, etc.
  • Support Small to medium capital project process engineering.
  • Monitors process performance and identifies opportunities for improving yield, energy efficiency, and reliability.
  • May plan test runs and recommends projects to address opportunities.
  • Maintain current work lists with priorities.
  • Support Key Performance Indicators (KPI) included as part of routine reporting (WABT curve, fouling, chemical and catalyst budgets, yields, etc.)
  • Manage catalyst performance and coordinate catalyst change timing
  • Support unit operation within environmental limits.
  • Assists in planning and executing turnarounds/outages, including scope development and post-event evaluations
  • Support and review operations procedures for start-up and shutdown.
  • Review and approve vendor chemical programs.
  • Inspect vessel internals for proper installation and tolerances of components
  • Monitor and approve catalyst loading
  • Publish recommendation memos and turnaround reports
  • Maintains and updates process documentation.
  • Troubleshoots and maintains unit mass balance within tolerance.
  • Interact and communicate with Board Operators daily.
  • Participate in Alarm rationalization.
  • Understand controls logic and any Advanced Process Controls (APC) Support inclusive of energy, water, and tank farm systems
  • Supports collaboration with operations, engineering, and maintenance teams to resolve operational challenges.
  • Develops and maintains relationships with console and field operators.
PROJECT PROCESS LEADERSHIP
  • Work with Area Team to develop project ideas and submit project request forms (PRF) with a memo detailing economic benefits and justification
  • Work with process controls group to develop / implement APC
  • Provide process design basis
PROCESS OPTIMIZATION
  • Review unit KPIโ€™s for the month and include analyses when appropriate with supporting data.
  • Include unit performance on key economic drivers.
  • Include recommendations for performance and reliability improvements and compliance with environmental permits.
  • Participate, attend and present in Advisory Group Calls and Face to Face Technology Meetings.
  • Schedule reviews with vendors and Technologists.
  • Work with Technologists to understand and implement unit best practices.
  • Set outside feedstock properties and discuss opportunity feeds with Product Control.
  • Know and understand the process fully to identify constraints.
  • Work with Product Control for setting appropriate unit targets.
  • Monitor and optimize Unit yield.
  • Participate as key decision maker for selecting programs, catalyst loads, etc.
  • Communicate with Product Control and other relevant groups regarding: Catalyst budget curves / current performance Operation against / changing process constraints Unit actual yields vs Linear Programming (LP) model yields โ€“ monitor accuracy of LP yields Understand Product Control targets and ensure proper implementation / understanding by Operations Support Product Control on required rigorous model runs as necessary
TECHNICAL PSM STEWARDSHIP
  • Support Critical Process Variables and Not to Exceed (CPV/NTE) Maintenance and Operating Limits.
  • Lead and Participate in the MOC (Management of Change) process.
  • Perform environmental calculations (leaks, maximum intended inventory, etc.)
  • Lead Incident Investigations for process related events.
  • Participates in hazard evaluations, incident investigations, and management of change.
  • Support instrumentation Process Safety Information (PSI) and troubleshooting (thermowell calculations, orifices, etc.).
  • Provide and approve special chemical procedures.
Education, Experience and Skills Minimum Qualifications:
  • Must have a Bachelorโ€™s degree in Chemical Engineering discipline. (Education must be obtained/completed prior to start date)
  • Must have a minimum of 5 years as a Chemical/Process Engineer in the oil/gas refining industry.
  • Must be proficient in Microsoft: Word, Excel and Outlook.
  • Must be able to wear appropriate PPE in the refinery (respirator), be able to physically perform all tasks in the field and take hair drug test and physical.
  • Must have a clean and valid driverโ€™s license.
  • Must be legally authorized to work in the US without the need for future VISA sponsorship.
  • Travel Requirement is 5% or less.
  • Must be able to work: the onsite 9/80's schedule with the ability to provide occasional after-hours support and support TAR approximately once a year.

****Relocation may be available.**** This position belongs to a family of jobs with increasing responsibility, competency and skill level. Actual position title and pay grade will be based on the selected candidateโ€™s experience and qualifications. Learn more about Marathon Petroleumโ€™s benefits at www.mympcbenefits.com. As an energy industry leader, our career opportunities fuel personal and professional growth.

Location: Carson, California

Job Requisition ID: 00023386

Pay Min/Max: $106,900.00 - $184,300.00

Salary Grade: 11 - 12

Location Address: 2350 E 223rd St

Additional locations: Wilmington, California

Education: Bachelors (Required)

Employee Group: Full time

Employee Subgroup: Regular

Marathon Petroleum Company LP is an Equal Opportunity Employer and gives consideration for employment to qualified applicants without discrimination on the basis of race, color, religion, creed, sex, gender (including pregnancy, childbirth, breastfeeding or related medical conditions), sexual orientation, gender identity, gender expression, reproductive health decision-making, age, mental or physical disability, medical condition or AIDS/HIV status, ancestry, national origin, genetic information, military, veteran status, marital status, citizenship or any other status protected by applicable federal, state, or local laws.

If you would like more information about your EEO rights as an applicant, click here.

If you need a reasonable accommodation for any part of the application process at Marathon Petroleum LP, please contact our Human Resources Department at talentacquisition@marathonpetroleum.com.

A Human Resources representative will review your request and contact you to discuss a reasonable accommodation.

  • Marathon Petroleum offers a total rewards program which includes, but is not limited to, access to health, vision, and dental insurance, paid time off, 401k matching program, paid parental leave, and educational reimbursement.
  • The hired candidate will also be eligible for a discretionary company-sponsored annual bonus program.

Equal Opportunity Employer: Veteran / Disability

We will consider all qualified Applicants for employment, including those with arrest or conviction records, in a manner consistent with the requirements of applicable state and local laws. In reviewing criminal history in connection with a conditional offer of employment, Marathon will consider the key responsibilities of the role.

About Marathon Petroleum Corporation Marathon Petroleum Corporation (MPC) is a leading, integrated, downstream energy company headquartered in Findlay, Ohio. The company operates the nation's largest refining system. MPC's marketing system includes branded locations across the United States, including Marathon brand retail outlets. MPC also owns the general partner and majority limited partner interest in MPLX LP, a midstream company that owns and operates gathering, processing, and fractionation assets, as well as crude oil and light product transportation and logistics infrastructure.

#J-18808-Ljbffr