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

Process Lead Engineer

Saint Louis, MO · On-site

$96K - $125K/yr

The Process Engineer works closely with clients, process architects, utilities engineers, mechanical engineers, and construction teams to translate manufacturing processes into clear, coordinated ...

Process Lead Engineer

Saint Louis, MO · On-site

$96K - $125K/yr

The Process Engineer works closely with clients, process architects, utilities engineers, mechanical engineers, and construction teams to translate manufacturing processes into clear, coordinated ...

Process Lead Engineer

Saint Louis, MO

$96K - $125K/yr

The Process Engineer works closely with clients, process architects, utilities engineers, mechanical engineers, and construction teams to translate manufacturing processes into clear, coordinated ...

Process Lead Engineer

Saint Louis, MO

$96K - $125K/yr

The Process Engineer works closely with clients, process architects, utilities engineers, mechanical engineers, and construction teams to translate manufacturing processes into clear, coordinated ...

Process Lead Engineer

Saint Louis, MO · On-site

$96K - $125K/yr

The Process Engineer works closely with clients, process architects, utilities engineers, mechanical engineers, and construction teams to translate manufacturing processes into clear, coordinated ...

Process Lead Engineer

Saint Louis, MO

$96K - $125K/yr

The Process Engineer works closely with clients, process architects, utilities engineers, mechanical engineers, and construction teams to translate manufacturing processes into clear, coordinated ...

Works closely with Controls engineers for design of new or improved control process. Interacts with other departments such as quality, PD, Maintenance, and Manufacturing. Provides support and ...

Works closely with Controls engineers for design of new or improved control process. Interacts with other departments such as quality, PD, Maintenance, and Manufacturing. Provides support and ...

Showing results 41-60

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.

Process Engineer III, Manufacturing Sciences

Thermo Fisher Scientific

Saint Louis, MO

Full-time

Posted 19 days ago


Thermo Fisher Scientific rating

7.7

Company rating: 7.7 out of 10

Based on 423 frontline employees who took The Breakroom Quiz

198th of 538 rated manufacturers


Job description

Work Schedule

Standard (Mon-Fri)

Environmental Conditions

Adherence to all Good Manufacturing Practices (GMP) Safety Standards, Office, Some degree of PPE (Personal Protective Equipment) required (safety glasses, gowning, gloves, lab coat, ear plugs etc.)

Job Description

How will you make an impact?

We are searching for a Process Engineer 3 with education and experience in biopharmaceutical processing or a related field. This member of our team provides technological input in the development, validation, and transfer of manufacturing processes. A Process Engineer 3 routinely supports the Process Engineering team as technical owners of customer programs in a manufacturing environment and will be highly involved and act as a subject matter expert in defining and shaping Thermo Fisher Scientific’s own technology programs. This role will collaborate internally with supervisors and technicians in the Operations department, Quality Assurance, fellow Engineers, and scientists in Process Development and with the client as a Process Engineer program lead. These activities are conducted in projects and involve teamwork with experts across functional groups to ensure project success. 

What will you do?

  • Draft, review and approve Standard Operation Procedures, and Job Aids and consult internally to ensure scientifically sound and robust procedures. 
  • Collaborate with the process development to develop standardized methodologies and learn/explore new methodologies for conducting unit operations at the manufacturing scale including cell culture, harvest, and purification. 
  • Contribute to Internal and Customer meetings based upon sound evidence guided by minimal supervision. 
  • Manages internal projects and tasks and lead client projects and manage timelines with minimal support from supervision. 
  • Actively identify error proofing opportunities and initiate and drive engineering initiatives to improve practices and procedures with minimal supervision. 
  • Provide scientific expertise for GMP deviations by assessing, reviewing and approving the impact of major deviations on both the product quality and the validation of the process. 
  • Lead changes to equipment and process design, proactively and with minimal supervision. 
  • Draft, review and approve Manufacturing Batch Records, Performance Qualifications, Process Validation protocols, process flow diagrams, automation methods, and Bill of Materials, ensuring the process is technically accurate and designed for Manufacturing.
  • Draft, review, and approve Process control documents, campaign summary report and process validation reports 
  • Reviews, analyzes and trends process data without supervision
  • Provide technical feedback on documents created by other departments, such as Tech Transfer Protocols and SOPs. 
  • Troubleshoot technical challenges on the manufacturing floor as needed for a 24/7 manufacturing facility. 
  • Support our MSAT team with additional tasks to improve the site, ensure patient safety, and deliver for our customers. 
  • Provides development and training for Process Engineers/Scientists.

How will you get here?

Education 

  • Bachelor’s degree required in a scientific field, preferably an engineering field. 
  • 5+ years of experience in GMP regulated Biologics / Pharma Industry, or equivalent experience (or master's degree in a scientific field + 3 years' experience or Ph.D.).
  •  

Experience 

  • 5+ years of experience in GMP regulated Biologics / Pharma Industry, or equivalent experience (or master's degree in a scientific field + 3 years' experience or Ph.D.). 
  • Follow Environmental, Health and Safety policies and procedures and ensure a safe and healthy workplace environment. 
  • Ability to self-motivate, prioritize work and time. 
  • Demonstrates a foundation in general scientific practices, principles, and concepts. 
  • Writes and communicates effectively. 
  • Ability to work both independently and as part of a team. 
  • Knowledge of current Good Manufacturing Practices and US/EU regulations.
  • Intermediate knowledge of statistical methods used for Pharmaceutical Process Analysis is a plus. 
  • Proficient in Microsoft Word and Excel. 
  • Ability to stand for prolonged periods of time and gown into manufacturing areas. 

What Thermo Fisher Scientific employees say

Pay

Benefits

Hours and flexibility

Workplace

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