1

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

Senior Process Engineer (REQ865)

Saint Louis, MO · Remote

$106K - $137K/yr

Senior Process Engineer Maryland Heights, MO Spartech offers a competitive salary, incentives, and benefit programs! Spartech, LLC, headquartered in Maryland Heights, Missouri, has over a dozen ...

Senior Process Engineer (REQ865)

Saint Louis, MO · On-site +1

$98K - $127K/yr

Senior Process Engineer Maryland Heights, MO Spartech offers a competitive salary, incentives, and benefit programs! Spartech, LLC, headquartered in Maryland Heights, Missouri, has over a dozen ...

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 ...

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 ...

Senior Process Chemist Kelly ® Science & Clinical is seeking a Senior Process Chemist for a 6 ... Collaborate with analytical chemists, process engineers, project managers, and external partners to ...

Sr. MS&T Process Engineer II

Maryland Heights, MO · On-site

$100K - $130K/yr

The Sr. MS&T Engineer II authors and executes validation strategies, analyzes complex manufacturing and process data, supports investigations and change controls, and drives continuous improvement ...

Sr. MS&T Process Engineer II

Maryland Heights, MO · On-site

$100K - $130K/yr

The Sr. MS&T Engineer II authors and executes validation strategies, analyzes complex manufacturing and process data, supports investigations and change controls, and drives continuous improvement ...

Process Engineer Location : St Louis, MO Hybrid Process : Teams Interview Length : 6-12 months VISA : US or GC Only Must have Food Industry experience * Design, budget, implement, and optimize new ...

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 ...

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 ...

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 ...

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 ...

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 ...

next page

Showing results 1-20

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 Aug 10, 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 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.

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 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.

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 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 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:
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.

Senior Process Engineer (REQ865)

Spartech

Saint Louis, MO • Remote

$106K - $137K/yr

Full-time

Medical, Dental, Vision, Life, Retirement, PTO

Posted 18 days ago


Spartech rating

5.8

Company rating: 5.8 out of 10

Based on 18 frontline employees who took The Breakroom Quiz

72nd of 84 rated plastic manufacturers


Job description

Senior Process Engineer

Maryland Heights, MO

Spartech offers a competitive salary, incentives, and benefit programs!

Spartech, LLC, headquartered in Maryland Heights, Missouri, has over a dozen locations throughout the United States. We have a broad customer base with extensive product offerings and technologies. Many of our materials are used in products you might see every day - for example if you start your morning with a single serve yogurt, the container you ate from may be made from one of Spartech’s products or the refrigerator where the yogurt was stored could have Spartech products in its interior features. More unique uses of our products can be seen in military or security applications, for example in fighter jet canopies or bullet resistant windows. From routine daily-life to life-saving applications—we make a difference. Our broad scope of products and services keep our environment interesting and challenging with a culture focused on success. If you want to make a difference in a fast-paced environment with a company large enough to offer you room to grow but not so large that you become “just a number”, Spartech might be the ideal company for you.

General Summary and Essential Duties & Responsibilities:

The Senior Process Engineer is responsible for leading capital equipment projects that support the growth, modernization, safety, and optimization of plastics manufacturing operations. This position manages projects from concept through production startup, including identifying and developing equipment specifications, vendor evaluation, process design, commissioning, and ensuring compliance with all applicable safety and regulatory requirements.

Requirements

Key Responsibilities:

Capital Planning & Equipment Strategy

  • Evaluate manufacturing capacity requirements and identify capital equipment investments needed to support business growth.
  • Develop equipment specifications for extrusion, cast acrylic manufacturing, resin handling, material conveying, blending, automated packaging, robotics, and secondary operations.

Equipment Procurement & Vendor Management

  • Develop RFQs, technical specifications, and statements of work for capital equipment projects.
  • Solicit, review, and compare vendor quotations, technical proposals, and commercial terms.

Project Management

  • Lead capital equipment projects from concept through startup and full production validation.

Equipment Installation & Commissioning

  • Manage equipment delivery, rigging, installation, utility connections, and startup activities.
  • Coordinate facility modifications, electrical requirements, compressed air systems, chilled water systems, resin delivery systems, and process cooling infrastructure.

Process Optimization & Continuous Improvement

  • Analyze production performance following implementation and identify opportunities for optimization.
  • Support OEE improvement initiatives and manufacturing cost reduction programs.
  • Partner with Operations and Process Engineering teams to improve machine utilization, efficiency, and product quality.

Safety, Regulatory & Compliance Responsibilities

  • Lead the integration of safety requirements into all capital equipment projects from concept through startup.
  • Ensure equipment designs comply with OSHA regulations, machine guarding requirements, lockout/tagout (LOTO) standards, electrical safety requirements, and applicable ANSI, NFPA, and industry standards.

Drive a zero-injury culture by promoting safe work practices and proactively addressing safety concerns throughout project execution.

Education & Experience Requirements:

  • Bachelor's degree in Chemical Engineering, Mechanical Engineering, Manufacturing Engineering, Industrial Engineering, Electrical Engineering, or related technical discipline.
  • 7+ years of experience managing capital equipment projects within a plastics manufacturing environment.
  • Chemical manufacturing background.
  • Experience with injection molding, extrusion, thermoforming, blow molding, or related plastics processing technologies.

Knowledge, Skills & Abilities:

  • Capital equipment acquisition and implementation
  • Plastics processing technologies
  • Injection molding and extrusion equipment
  • Manufacturing process optimization
  • Equipment validation and commissioning
  • Project management and budget administration
  • Lockout/Tagout (LOTO) implementation
  • Machine guarding and safeguarding systems
  • NFPA and ANSI standards compliance
  • Safety leadership and culture development

Benefits

We offer competitive salary, incentives, and benefit programs. – Most Benefits Start Day ONE!

Benefits include:

  • Medical, Dental, and Vision.
  • Flexible Spending Accounts.
  • Company paid Life & Long-term/Short-term disability programs.
  • 401(k) with strong company match.
  • 120 hours Paid Time Off (pro-rated based on hire date).
  • 11 paid holidays.

Spartech, LLC provides equal employment opportunity to all qualified applicants regardless of race, color, religion, national origin, sex, sexual orientation, gender identity, age, disability, genetic information, or veteran status, or other legally protected classification in the state in which a person is seeking employment. Spartech will use E-Verify to ensure employment eligibility of newly hired employees where required.


What Spartech employees say

Pay

Benefits

Hours and flexibility

Workplace

Get the full story on Breakroom