What is the salary for the Injection Molding Engineering Co-Op role at Flex?

The listed annual base salary range is $57K–$93K. This figure is taken from the posting itself.

Does Flex sponsor work visas for the Injection Molding Engineering Co-Op role?

This employer will not provide visa sponsorship for this role.

Where is the Injection Molding Engineering Co-Op role at Flex based?

This role is based in Libertyville, IL.

What degree is required for the Injection Molding Engineering Co-Op role at Flex?

This role requires a Not specified.

How many years of experience does this Injection Molding Engineering Co-Op role require?

The posting calls for at least 0 years of relevant experience.

What techniques or methods are required for this Injection Molding Engineering Co-Op role?

short-shot studies, process window development, IQ/OQ/PQ validation, defect/root cause analysis.

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Injection Molding Engineering Co-Op

Flex · Libertyville, IL1w agoverified 10 h ago

$57k – $93kfrom the posting

Support injection molding process development, mold trials, and validation for medical components

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Thermoplastics · Process Engineering roles, by email

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Worth knowing

Why it is interesting. Hands-on mold trials, process window development, and IQ/OQ/PQ validation for precision medical parts at a major contract manufacturer.

Might not be for you. Part-time (20 hrs/week) co-op with heavy documentation and validation work, not open-ended R&D.

Mostly at the benchHands-on execution First industry roleInternship-friendly Realistic requirements

Core polymer roleAssist in injection mold trials and process window development; short-shot and imbalance studies; Plastics/Polymer Engineering major

Seniority: Intern/Co-op
Work: On-site
Type: Internship
Experience: 0+ yrs
Industry: Medical devices
Role: Process Engineering
Visa: No sponsorship

Techniques

short-shot studies1 role process window development1 role IQ/OQ/PQ validation22 rolesdefect/root cause analysis

Benefits

equity/stock

Role details

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.

Job Summary

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To support our extraordinary teams who build great products and contribute to our growth, we’re looking to add an Injection Molding Engineering Co-Op located in our Libertyville, IL site.

Reporting to Process & Automation Engineering Team, the part-time student will support injection molding process development and validation activities for high-precision medical components, while collaborating and working alongside Engineers and cross-functional teams.

What a typical day looks like

Assist in injection mold trials and process window development
Support startup optimization and parameter validation
Perform short-shot and imbalance studies
Support defect analysis and root cause investigations
Assist with IQ/OQ/PQ documentation
Support tooling PM and mold performance assessments

Attend team meetings to support project work as needed

Student qualities we’re seeking for this co-op assignment

Currently enrolled student pursuing degree in Plastics Engineering, Polymer Engineering, Mechanical Engineering, or Materials Science major
Understanding of Injection Molding Process (injection molding fundamentals)
Basic process validation knowledge in highly regulated environments
Defect & root cause analysis experience
Understanding of mold tooling components and ability to read basic mechanical drawings
Strong documentation and communication skills

Previous manufacturing floor internship experience; a plus!

Co-Op Program Requirements

Ability to work 20 hours/week (in person) during the part-time co-op assignment
Currently enrolled in accredited university

3.0 GPA min

Application Deadline:

Applications for this job position will be accepted for at least five days following the job posting start date below and continuing until the end date below or until the position is filled. This posting may close sooner due to application volume.

Job Posting Start Date 09-09-2026 Job Posting End Date 09-14-2026



The base pay range for this position is provided below. The final base rate offered will be determined using job-related, non-discriminatory criteria, including but not limited to experience, qualifications, geographic location, education, external market data, and internal equity.

Pay Range $27.50 - $44.50 Hourly

Job Category

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Intern

Is Sponsorship Available?

NoFlex 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 [email protected] 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).