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Freelance Process Engineer Jobs in California (NOW HIRING)

Solomon Page

DevOps/Automation Engineer

Pleasanton, CA · On-site

$70 - $85/hr

Collaborate closely with Development and QA teams to streamline software delivery processes. * Lead ... freelancers - which sets us apart in the industries we serve. About Solomon Page Founded in 1990 ...

Abbott

Cloud Software Engineer II

Los Angeles, CA · On-site

$81K - $141K/yr

... process that meets FDA and other regulatory agencies requirements. Work on software design, coding ... freelance work and professional experience). * Excellent communication skills and be able to work ...

Abbott

Cloud Software Engineer II

Sylmar, CA · On-site

$81K - $141K/yr

... process that meets FDA and other regulatory agencies requirements. Work on software design, coding ... freelance work and professional experience). * Excellent communication skills and be able to work ...

Abbott

Cloud Software Engineer II

Los Angeles, CA

$81K - $141K/yr

... process that meets FDA and other regulatory agencies requirements. Work on software design, coding ... freelance work and professional experience). * Excellent communication skills and be able to work ...

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All JobsProcess Engineer JobsFreelance Process Engineer JobsFreelance Process Engineer Jobs in California

Freelance Process Engineer information

See California salary details

$48.9K

$90.8K

$140.6K

How much do freelance process engineer jobs pay per year?

As of Jun 14, 2026, the average yearly pay for freelance process engineer in California is $90,813.00, according to ZipRecruiter salary data. Most workers in this role earn between $73,500.00 and $101,700.00 per year, depending on experience, location, and employer.

What is the difference between Freelance Process Engineer vs Process Engineer?

AspectFreelance Process EngineerProcess Engineer
CredentialsRelevant engineering degree, certifications optionalEngineering degree, professional certifications often preferred
Work EnvironmentIndependent, project-based, remote or on-siteFull-time, employed by a company, on-site or hybrid
Employer & Industry UsageClients across industries, contract-basedManufacturing, chemical, or industrial firms
Search & Comparison IntentFreelance Process Engineer vs Process EngineerFreelance Process Engineer vs Process Engineer

While both roles focus on optimizing processes, a Freelance Process Engineer works independently on various client projects, often remotely, and may lack the full-time employment benefits. A Process Engineer is typically employed full-time within a company, focusing on ongoing process improvements in a specific industry. The choice depends on your preference for independence versus stability.

What is a Freelance Process Engineer?

A Freelance Process Engineer is a professional who designs, optimizes, and troubleshoots industrial processes on a contract or project basis, rather than as a full-time employee. They work with companies in industries like manufacturing, pharmaceuticals, or energy to improve efficiency, safety, and productivity. Freelance Process Engineers often handle multiple clients, offering flexibility and specialized expertise for short-term or ongoing projects. They may be involved in process design, simulation, equipment selection, or regulatory compliance.

How do Freelance Process Engineers typically collaborate with client teams during projects?

Freelance Process Engineers often work closely with client teams by participating in regular virtual meetings, providing detailed progress updates, and integrating feedback to ensure alignment with project goals. Effective collaboration may require adapting to different communication styles and project management tools used by various organizations. Building strong professional relationships and being proactive in clarifying expectations are key to overcoming challenges such as remote integration and limited onsite presence. This collaborative approach helps ensure successful project delivery and client satisfaction.

What are the key skills and qualifications needed to thrive as a Freelance Process Engineer, and why are they important?

To thrive as a Freelance Process Engineer, a strong background in chemical or mechanical engineering, process optimization, and project management, often supported by a relevant engineering degree and professional certification, is essential. Familiarity with industry-standard tools such as AutoCAD, Aspen HYSYS, and process simulation software is typically required. Exceptional problem-solving, communication, and client management skills help freelancers stand out by effectively addressing client needs and adapting to diverse projects. These abilities enable the engineer to deliver efficient solutions, ensure client satisfaction, and maintain a competitive edge in the freelance marketplace.
What are the most commonly searched types of Process Engineer jobs in California? The most popular types of Process Engineer jobs in California are:
What are popular job titles related to Freelance Process Engineer jobs in California? For Freelance Process Engineer jobs in California, the most frequently searched job titles are:
What job categories do people searching Freelance Process Engineer jobs in California look for? The top searched job categories for Freelance Process Engineer jobs in California are:
What cities in California are hiring for Freelance Process Engineer jobs? Cities in California with the most Freelance Process Engineer job openings:
Freelance Process Engineer jobs near you
Infographic showing various Freelance Process Engineer job openings in California as of June 2026, with employment types broken down into 3% Locum Tenens, 87% Full Time, 1% Part Time, 3% Temporary, 3% Contract, and 3% Nights. Highlights an 87% Physical, 5% Hybrid, and 8% Remote job distribution, with an average salary of $90,813 per year, or $43.7 per hour.

Cardiologists (Freelance - Remote) - San Francisco, US

Prolific Academic Ltd

San Francisco, CA • Remote

$200/hr

Full-time

Posted 9 days ago

Job description

Cardiologists (Freelance - Remote)About Prolific

Prolific is not just another player in the AI space – we are building the biggest pool of quality human data in the world.

Over 35,000 AI developers, researchers, and organizations use Prolific to gather data from paid study participants with a wide variety of experiences, knowledge, and skills.

The role

We are seeking qualified Cardiologists to support a high-impact AI development project focused on medical image interpretation and clinical accuracy. As AI models become increasingly capable of analyzing complex medical data, we need experienced specialists to help ensure their outputs meet the highest standards of quality and reliability.

This is a flexible, remote opportunity paying approximately $200 per hour. Your expertise will directly contribute to the development of advanced AI systems used in healthcare and medical research.

To qualify for this project, you will be required to complete a short paid skills assessment as part of the screening process. The assessment is compensated at a rate of $48 per hour and typically takes no more than 5 minutes to complete.

What you'll bring
  • Verified status as a qualified Cardiologists with relevant professional credentials
  • Experience interpreting and analysing medical images and Cardiology-related data
  • Strong attention to detail and the ability to assess complex medical information accurately
  • A reliable, fast internet connection and access to a computer
  • A PayPal account to receive payments from our clients
What you'll be doing in the role
  • Annotating medical images using your professional expertise
  • Reviewing and verifying AI-generated interpretations of medical images
  • Correcting inaccuracies and providing expert feedback on AI-generated responses
  • Evaluating the quality, accuracy, and clinical relevance of model outputs
  • Helping improve the performance of next-generation AI systems used in medical applications
Why Prolific is a great platform to join as a Participant

Joining our platform as a Prolific participant will give you the chance to influence the AI models of the future using professional legal expertise. Once you pass our assessment, you can join Prolific in just 15 minutes, and start enjoying competitive pay rates, flexible hours, and the ability to work from home.

We've built a unique platform that connects researchers and companies with a global pool of participants, enabling the collection of high-quality, ethically sourced human behavioural data and feedback. This data is the cornerstone of developing more accurate, nuanced, and aligned AI systems.

We believe that the next leap in AI capabilities won't come solely from scaling existing models, but from integrating diverse human perspectives and behaviours into AI development. By providing this crucial human data infrastructure, Prolific is positioning itself at the forefront of the next wave of AI innovation – one that reflects the breadth and the best of humanity.

Links to more information on Prolific

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Privacy Statement

By submitting your application, you agree that Prolific may collect your personal data for recruiting and global organisation planning. Prolific's Candidate Privacy Notice explains what personal information Prolific may process, where Prolific may process your personal information, its purposes for processing your personal information, and the rights you can exercise over Prolific use of your personal personal information.