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Sr Process Engineer Jobs in O Fallon, IL (NOW HIRING)

CRB

Senior Process Engineer - Liquid Systems

Saint Louis, MO · On-site

$101K - $130K/yr

We are seeking a Senior Process Engineer with deep expertise in liquid processing systems within the food and beverage industry . This role will lead the design and execution of process systems for ...

Pretium Packaging - USA

Process engineer

Saint Louis, MO · On-site

$88K - $103K/yr

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 ...

Pretium Packaging

Process engineer

Saint Louis, MO

$42.31 - $49.52/hr

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 ...

Pretium Packaging

Process Engineer

Saint Louis, MO · On-site

$90K - $130K/hr

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 · On-site

$95K - $102K/yr

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

  • PTO

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 ...

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 ...

Clayco (LJC)

Senior Process Designer

Saint Louis, MO

$95K - $102K/yr

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

  • PTO

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 ...

Air Products and Chemicals, Inc.

Process Engineer

Saint Louis, MO · On-site

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

  • PTO

Louis MO, is seeking a Process Engineer for the evaluation, design, and support of membrane process gas applications. This position will focus on the high growth biogas upgrading market and will work ...

Clayco

Senior Process Designer

Saint Louis, MO · On-site

$95K - $102K/yr

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

  • PTO

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 ...

Clayco (LJC)

Senior Process Designer

Saint Louis, MO · On-site

$95K - $102K/yr

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

  • PTO

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 ...

Clayco (LJC)

Senior Process Designer

Saint Louis, MO · On-site

$95K - $102K/yr

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

  • PTO

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 ...

Air Products and Chemicals, Inc.

Process Engineer

Saint Louis, MO · On-site

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

  • PTO

Louis MO, is seeking a Process Engineer for the evaluation, design, and support of membrane process gas applications. This position will focus on the high growth biogas upgrading market and will work ...

Clayco (LJC)

Senior Process Designer

Saint Louis, MO · On-site

$95K - $102K/yr

  • Medical

  • Dental

  • Vision

  • Life

  • Retirement

  • PTO

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 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 ...

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All JobsSr Process Engineer JobsSr Process Engineer Jobs in O'Fallon, IL

Sr Process Engineer information

See O Fallon, IL salary details

$70K

$113K

$159K

How much do sr process engineer jobs pay per year?

As of Aug 18, 2026, the average yearly pay for sr process engineer in O'Fallon, IL is $112,978.00, according to ZipRecruiter salary data. Most workers in this role earn between $97,000.00 and $125,500.00 per year, depending on experience, location, and employer.

What is a Sr Process Engineer?

Senior Process Engineers are experienced professionals responsible for designing, optimizing, and overseeing the processes used in manufacturing or production environments. They analyze workflows, troubleshoot process issues, and implement improvements to increase efficiency, reduce costs, and ensure product quality. Sr Process Engineers often lead teams, manage projects, and work closely with other departments such as quality assurance, maintenance, and operations. Their expertise is crucial in industries like chemicals, pharmaceuticals, oil and gas, and food processing. They typically hold a degree in engineering and have several years of experience in process engineering roles.

What are the key skills and qualifications needed to thrive as a Sr Process Engineer?

To thrive as a Sr Process Engineer, you need a solid background in chemical, mechanical, or industrial engineering, often with a bachelor's or master's degree and relevant industry experience. Familiarity with process simulation software (such as Aspen Plus or HYSYS), Six Sigma or Lean certifications, and knowledge of safety and regulatory standards are typically required. Strong problem-solving, project management, and communication skills help distinguish top performers in this role. These skills and qualifications are vital for optimizing processes, ensuring efficiency and safety, and driving continuous improvement in complex manufacturing environments.

How does a Sr Process Engineer typically collaborate with cross-functional teams to improve manufacturing efficiency?

Sr Process Engineers work closely with teams such as production, quality assurance, maintenance, and R&D to identify areas for process optimization. They often lead or participate in cross-functional meetings to gather data, analyze workflow bottlenecks, and implement solutions that enhance efficiency and product quality. Effective communication and project management skills are essential, as Sr Process Engineers must balance technical requirements with practical constraints while ensuring all stakeholders are aligned with proposed changes.

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

AspectSr Process EngineerProcess Engineer
QualificationsBachelor's degree in engineering, 5+ years experience, certifications like Six SigmaBachelor's degree in engineering or related field, 1-3 years experience
ResponsibilitiesLead process improvements, optimize manufacturing processes, mentor junior staffAssist in process development, data collection, support process optimization
Work EnvironmentManufacturing plants, industrial facilities, cross-functional teamsManufacturing settings, engineering teams, project-based tasks

The main difference between a Sr Process Engineer and a Process Engineer lies in experience, responsibility level, and scope of work. The Sr Process Engineer typically leads projects, mentors others, and has more advanced qualifications, while the Process Engineer supports and executes process improvements under supervision.

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 such as Six Sigma or PMP.

What does a senior process engineer do?

A senior process engineer designs, develops, and optimizes manufacturing or industrial processes to improve efficiency, safety, and quality. They analyze data, troubleshoot issues, and implement process improvements, often using tools like process simulation software and adhering to industry standards. They also mentor junior engineers and collaborate with cross-functional teams to ensure smooth operations.

What cities near O'Fallon, IL are hiring for Sr Process Engineer jobs?

Cities near O'Fallon, IL with the most Sr Process Engineer job openings:

Sr Process Engineer jobs near you
Infographic showing various Sr Process Engineer job openings in O'Fallon, IL 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 $112,978 per year, or $54.3 per hour.

Senior Process Engineer - Liquid Systems

CRB

Saint Louis, MO

$101K - $130K/yr

Full-time

Re-posted 4 days ago

Job description

Company Description

CRB is a leading provider of sustainable Engineering, Architecture, Construction and Consulting solutions to the global life sciences and food and beverage industries. Our employees provide best-in-class solutions that drive success and positive change for our clients, our people and our communities. CRB is a privately held company with a rich history of serving clients throughout the world, consistently striving for the highest standard of technical knowledge, creativity and execution.

Job Description

We are seeking a Senior Process Engineer with deep expertise in liquid processing systems within the food and beverage industry. This role will lead the design and execution of process systems for liquid products such as beverages, dairy, sauces, and other fluid-based consumables.

You’ll be responsible for managing the scope, schedule, and budget of your assigned systems or unit operations, while collaborating closely with clients, vendors, and internal teams to deliver high-quality, innovative solutions.

This position can be hybrid with up to 50% travel. 

Key Responsibilities

  • Lead the design and development of liquid processing systems for food and beverage manufacturing facilities.
  • Translate client requirements into process design scope and deliverables.
  • Manage and coordinate with internal teams, clients, vendors, and construction partners.
  • Oversee technical deliverables such as P&IDs, mass and energy balances, equipment specifications, and process narratives.
  • Support and lead activities such as:
    • Vendor package management and technical bid evaluations
    • Factory Acceptance Testing (FAT)
    • Risk assessments (HAZOP, HACCP)
    • 3D model reviews and coordination
    • Commissioning and startup support
  • Mentor junior engineers and contribute to technical development initiatives.
Qualifications
  • Bachelor’s degree in Chemical, Mechanical, or Process Engineering (ABET-accredited)
  • 5+ years of experience in process engineering for liquid food or beverage systems, specifically in confectionary, pet food, fermentation, dairy, dressings and sauces.
  • Strong understanding of sanitary design, CIP systems, and fluid handling equipment
  • Excellent communication and project coordination skills
  • Familiarity with industry codes and regulatory standards (e.g., FDA, USDA, 3-A)

Preferred Qualifications

  • PE or EIT certification
  • Experience with construction support (RFIs, submittals, punch lists)
  • Hands-on experience with commissioning and troubleshooting liquid process systems
  • Knowledge of automation and control systems for liquid processes

Additional Information

All your information will be kept confidential according to EEO guidelines.

CRB is committed to hiring and retaining a diverse workforce. We are proud to be an Equal Opportunity Employer and it is our policy to provide equal opportunity to all people without regard to race, color, religion, national origin, ancestry, marital status, veteran status, age, disability, pregnancy, genetic information, citizenship status, sex, sexual orientation, gender identity or any other legally protected category. Employment is contingent on background screening.

CRB does not accept unsolicited resumes from search firms or agencies. Any resume submitted to any employee of CRB without a prior written search agreement will be considered unsolicited and the property of CRB. Please, no phone calls or emails.

CRB offers a complete and competitive benefit package designed to meet individual and family needs.

If you are unable to complete this application due to a disability, contact this employer to ask for an accommodation or an alternative application process.