Demo

Principal Process Engineer (Molding)

Flex
Flex Salary
Libertyville, IL Full Time
POSTED ON 4/11/2026
AVAILABLE BEFORE 5/26/2026
Flex is the diversified manufacturing partner of choice that helps market-leading brands design, build and deliver innovative products that improve the world. A career at Flex offers the opportunity to make a difference and invest in your growth in a respectful, inclusive, and collaborative environment. If you are excited about a role but don't meet every bullet point, we encourage you to apply and join us to create the extraordinary.

General Purpose:

This position is responsible for providing support to all injection molding operations, reducing scrap and set-up times, optimizing cycle times, and performing validations related to materials, presses, and molds as necessary, with a sharp focus on continuous improvement.

Principle Accountabilities:

  • Establish a robust process window for all injection molded components using Scientific Molding techniques along with Design for Experiments (DOE’s)Understand manufacturing and test equipment concepts, technologies and techniques
  • Improve manufacturing efficiency by analyzing and planning workflow, space requirements and utilization, and equipment layout
  • Coordinates maintenance and drive technical activities for cGMP compliant manufacturing improvement
  • Conduct process validation and optimization activities, including DOE (Design of Experiments) studies, process capability analysis, and root cause analysis, to identify opportunities for improvement and enhance process robustness.
  • Create and manage process documentation such as work instructions and set-up instructions
  • Develop new manufacturing equipment and processes; write equipment specifications.
  • Define equipment maintenance requirements, identify root-causes of equipment failures and develop hands-on maintenance skills.
  • Prepares technical writing including new Procedures, URS, Risk Assessments, Safety Assessments, and Functionality Tests
  • Work with other engineering stakeholders and customers on problem solving and continuous improvement to the design of equipment and products and may develop corrective and preventive action plans
  • May be involved in development and update of PFMEA for new products
  • May participate in control plan development
  • Write and update work instructions and other documents (e.g. specifications, procedures)
  • Examines and designs layout of equipment and workspace for maximum efficiency.
  • Confers with production group concerning product design and tooling to ensure efficient production methods.
  • Coordinates with customers to identify product specifications and design changes and responds to customer request.
  • Provides information for management recommendations from a technical and technical cost perspective.
  • Confers with management, engineering, and other staff regarding manufacturing capabilities, production schedules, and other considerations to facilitate production processes.
  • Applies statistical methods to estimate future manufacturing requirements and potential.

The experience we’re looking to add to our team:

  • Bachelor’s degree in engineering
  • 8 years of hands-on experience in injection molding is required.
  • Troubleshoot molding / manufacturing processes to mitigate production defects
  • Must have excellent knowledge of injection molding presses (hydraulic and electric), molds, mold design and other related processing equipment such as hoppers/loaders, blenders, dryers, sprue pickers, hot runner systems etc.
  • Must have experience designing manufacturing processes within schedule and budgetary parameters.
  • Must have experience developing, evaluating, and improving manufacturing methods.
  • Must have experience working with common molding grade plastics such as Polypropylene, Polycarbonate, ABS, Nylon etc.
  • RJG Master Molder Certification or equivalent preferred
  • Prior EOAT (End of Arm Tooling), six axis robot and programming experience preferred

MF15

  • Site

Flex is an Equal Opportunity Employer and employment selection decisions are based on merit, qualifications, and abilities. We do not discriminate based on: age, race, religion, color, sex, national origin, marital status, sexual orientation, gender identity, veteran status, disability, pregnancy status, or any other status protected by law. We're happy to provide reasonable accommodations to those with a disability for assistance in the application process. Please email accessibility@flex.com and we'll discuss your specific situation and next steps (NOTE: this email does not accept or consider resumes or applications. This is only for disability assistance. To be considered for a position at Flex, you must complete the application process first).

Salary.com Estimation for Principal Process Engineer (Molding) in Libertyville, IL
$86,262 to $99,908
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