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Senior Process Engineer Jobs in O Fallon, MO (NOW HIRING)

Pretium Packaging

Process Engineer

Saint Louis, MO · On-site

The Process Engineer assists plant leadership and works collaboratively with all other departments to maintain the flow of work in the process molding lines, ensuring customer products are being ...

Elementis

Process Engineer

Saint Louis, MO · On-site

The Process Engineer enables the safe and reliable production at a low cost that meets or exceeds the customer requirements. This role requires in-depth conceptual and practical knowledge in job ...

Clayco (LJC)

Senior Process Designer

Saint Louis, MO

$95K - $102K/yr

About LJC LJC Design & Engineering is a full-service architecture, engineering, and design firm ... Senior Process Designers play a pivotal role in ensuring project success through technical ...

kindeva

Process Engineer

Brentwood, MO · On-site

The engineer drives process optimization, contamination control, equipment lifecycle management, and continuous improvement while maintaining full compliance with cGMP , FDA , EMA , ISO , and other ...

kindeva

Process Engineer

Brentwood, MO · On-site

The engineer drives process optimization, contamination control, equipment lifecycle management, and continuous improvement while maintaining full compliance with cGMP , FDA , EMA , ISO , and other ...

kindeva

Process Engineer

Brentwood, MO · On-site

The engineer drives process optimization, contamination control, equipment lifecycle management, and continuous improvement while maintaining full compliance with cGMP , FDA , EMA , ISO , and other ...

kindeva

Process Engineer

Brentwood, MO · On-site

The engineer drives process optimization, contamination control, equipment lifecycle management, and continuous improvement while maintaining full compliance with cGMP , FDA , EMA , ISO , and other ...

Kindeva Drug Delivery

Process Engineer

Brentwood, MO · On-site

The engineer drives process optimization, contamination control, equipment lifecycle management, and continuous improvement while maintaining full compliance with cGMP , FDA , EMA , ISO , and other ...

Irca Group

Process Engineer

Affton, MO · On-site

The Process Engineer supports manufacturing operations by developing, optimizing, and standardizing production processes to improve efficiency, quality, and safety within the plant. This role plays a ...

Irca Group

Process Engineer

Affton, MO

The Process Engineer supports manufacturing operations by developing, optimizing, and standardizing production processes to improve efficiency, quality, and safety within the plant. This role plays a ...

Irca Group

Process Engineer

Affton, MO · On-site

The Process Engineer supports manufacturing operations by developing, optimizing, and standardizing production processes to improve efficiency, quality, and safety within the plant. This role plays a ...

G-TECH Services, Inc.

Be Seen First

Manufacturing Process Engineer - Paint Process

Wentzville, MO · On-site

$35 - $45/hr

Manufacturing Process Engineer (Paint Process) Location: Wentzville, MO Time shift: 12 hrs shifts (6 AM to 6 PM / 6 PM to 6 AM) Contract duration: 52 Weeks (likely extension and direct) Overtime ...

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Showing results 21-40

All JobsProcess Engineer JobsSenior Process Engineer JobsSenior Process Engineer Jobs in O'Fallon, MO

Senior Process Engineer information

See O Fallon, MO salary details

$70.2K

$113.3K

$159.5K

How much do senior process engineer jobs pay per year?

As of Sep 2, 2026, the average yearly pay for senior process engineer in O'Fallon, MO is $113,302.00, according to ZipRecruiter salary data. Most workers in this role earn between $97,300.00 and $125,800.00 per year, depending on experience, location, and employer.

What does a senior process engineer do?

A Senior Process Engineer is responsible for designing, optimizing, and overseeing processes within manufacturing or production environments. They analyze workflows, troubleshoot issues, and implement improvements to increase efficiency, safety, and product quality. Senior Process Engineers often lead projects, mentor junior engineers, and collaborate with cross-functional teams to ensure operational excellence. Their expertise is vital in industries like chemicals, pharmaceuticals, oil and gas, and food processing.

What are the key skills and qualifications needed to thrive as a senior process engineer?

To thrive as a Senior Process Engineer, you need a strong background in chemical or process engineering, problem-solving skills, and typically a bachelor's or master's degree in a relevant field. Expertise in process simulation software (such as Aspen Plus or HYSYS), Six Sigma or Lean certifications, and familiarity with process control systems are highly valued. Outstanding analytical abilities, leadership, and effective communication set top performers apart in this role. These skills and qualifications are crucial for optimizing processes, ensuring safety and compliance, and leading teams to achieve operational excellence.

What are some common challenges senior process engineers face when working on cross-functional teams?

Senior Process Engineers often collaborate with professionals from various departments, such as operations, quality, and maintenance. A common challenge is aligning diverse priorities and communication styles to achieve shared project goals. Successfully managing these differences requires strong interpersonal and project management skills, as well as the ability to translate technical concepts for non-engineering colleagues. Regular meetings and clear documentation can help ensure everyone stays informed and engaged throughout the process.

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

AspectSenior Process EngineerProcess Engineer
QualificationsBachelor's or Master's in Engineering, often with 5+ years experienceBachelor's degree in Engineering or related field, typically 1-3 years experience
ResponsibilitiesLeading process improvements, mentoring, project managementSupporting process development, data analysis, assisting senior staff
Work EnvironmentDesign teams, manufacturing plants, R&D departmentsManufacturing facilities, engineering teams, operational support

Senior Process Engineers typically have more experience, leadership duties, and oversee complex projects, while Process Engineers focus on supporting process development and implementation. Both roles are essential in manufacturing and engineering industries, but the senior role involves greater responsibility and strategic planning.

How much does a senior process engineer earn?

A senior process engineer typically earns between $80,000 and $130,000 annually, depending on experience, industry, and location. They often have specialized skills in process optimization, project management, and may hold certifications like Six Sigma or PE licensure.

What are the most commonly searched types of Process Engineer jobs in O'Fallon, MO?

The most popular types of Process Engineer jobs in O'Fallon, MO are:

What are popular job titles related to Senior Process Engineer jobs in O'Fallon, MO?

For Senior Process Engineer jobs in O'Fallon, MO, the most frequently searched job titles are:

What cities near O'Fallon, MO are hiring for Senior Process Engineer jobs?

Cities near O'Fallon, MO with the most Senior Process Engineer job openings:

Senior Process Engineer jobs near you
Infographic showing various Senior Process Engineer job openings in O'Fallon, MO as of August 2026, with employment types broken down into 100% Full Time. Highlights an 100% In-person job distribution, with an average salary of $113,302 per year, or $54.5 per hour.

Process Engineer

Pretium Packaging

Saint Louis, MO • On-site

Full-time

Re-posted 22 days ago

Pretium Packaging rating

6.9

Company rating: 6.9 out of 10

Based on 17 frontline employees who took The Breakroom Quiz

76th of 122 rated packaging manufacturers

Job description

Grow boldly with Pretium!
Pretium Packaging is searching for a talented, hands-on Process Engineer for our plant in St. Louis, Missouri.
About Us:
Pretium Packaging, founded in 1992, is a leading supplier of injection-blow molded plastic containers, known for delivering superior quality, value, and customer service. With 20 manufacturing locations across North America, we provide innovative, high-performance packaging solutions to a diverse portfolio of brand owners in the U.S. and Canada.
What You'll Be Responsible For:
The Process Engineer assists plant leadership and works collaboratively with all other departments to maintain the flow of work in the process molding lines, ensuring customer products are being produced in accordance with required specifications and quality standards. The Process Engineer will analyze process defects and find solutions. arriving at acceptable quality level throughout the process,
What you'll do:
  • Start up new and existing equipment, check out system for proper operation, calibrate equipment, perform loop checks, troubleshoot, and resolve system problems.
  • Respond to emergency work order requests, troubleshoot, and analyze systems, investigate the nature of the problems, check for software and hardware defects and verify equipment for proper operation.
  • Direct the installation of new systems to ensure specification and safety compliance by personnel and vendors.
  • Define internal quality control plan including gauging methods and frequency of inspection.
  • Assist production with new project set-ups, tool changes and program adjustments.
  • Troubleshoot problems related to the production process, recommend alternatives to meet planned production schedules and ensure product quality standards are maintained.
  • Modify existing systems, redesign software and system circuitry as necessary to meet project objectives.
  • Recommend improvements to encourage safe and reliable equipment operation on newly installed equipment.
  • Review and analyze daily check sheets for accuracy and to determine operating problems and required corrective action.
  • Monitor and ensure changeovers are completed as scheduled and in a proper manner.
  • Check and ensure preventive maintenance procedures are performed as scheduled and are accurately documented.
  • Maintain good housekeeping conditions and safe operating practices in the department.
  • Ensure weekly setup sheets are completed for all lines and preview for deviations from standards and follow up as necessary.
  • Investigate and resolve product quality problems as required.
  • Troubleshoot and diagnose equipment breakdowns and replace and rebuild machine components as needed.
  • Set up molding machines and trimmer, align and install molds, set and adjust time cycles, air pressures and water temperatures, position labeler, change over and adjust reamer, trim stations, material inspection system, and adjust sequence timing for all operations.
  • Coordinate the implementation of production schedules in the most efficient and productive manner.
  • Recommend and implement improvements to machine line operations to increase productivity and improve product quality.
  • Perform processing for new molds/tooling establishing run perimeters for best efficiency.

What you'll bring:
  • Bachelor's or associate's degree in mechanical/plastics engineering or related field.
  • Reheat blow process and automation experience
  • Experience with the following manufacturers of machinery: Aoki (ISBM/IBM/IM), Uniloy (IBM), and Zhongya (IM)
  • Root cause analysis and trouble-shooting experience
  • Experience with setting oven profiles
  • Infeed and outfeed conveyor experience
  • Effective leadership skills, strong decision-making skills, and ability to lead and drive project teams.
  • Well organized, accurate and attention to detail with the ability to lead and drive project teams.
  • Training or experience in Lean Manufacturing practices.
  • Able to travel and train as need throughout the region.

Why Join Pretium?
At Pretium Packaging, we manufacture rigid plastic containers for some of the most recognized brands in the marketplace. Our plants operate with a strong emphasis on safety, performance, and continuous improvement.
Equal Opportunity Employer
This employer is required to notify all applicants of their rights pursuant to federal employment laws.
For further information, please review the Know Your Rights notice from the Department of Labor.

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