# Injection Molding Engineering Co-Op at Flex - Company: Flex - Location: Libertyville, IL - Type: Internship ยท Internship - Posted: 2026-10-01 - Apply: https://flextronics.wd1.myworkdayjobs.com/careers/job/USA-IL-Libertyville/Injection-Molding-Engineering-Co-Op_WD229347 - Page: https://newgrad.ai/jobs/injection-molding-engineering-co-op-7ac8fd1b ## Summary by newgrad.ai What you'll do: - Participate in mold testing and develop processing parameters - Help optimize startup procedures and validate settings - Conduct short-shot trials and balance assessments - Investigate quality issues and identify root causes What they're looking for: - Enrolled student majoring in plastics, polymers, mechanical engineering, or materials science - Knowledge of injection molding principles and validation in regulated industries - Experience analyzing failures and determining causes - Comfortable interpreting technical drawings and communicating clearly Pay and perks: - $27.50 - $44.50 hourly - 20 hours/week on-site in Libertyville, IL - Minimum 3.0 GPA required ## Posting 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 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: 10-05-2026 Pay Range: $27.50 - $44.50 Hourly Job Category: Intern Relocation: Not eligible Is Sponsorship Available?: No 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). From Flex's public posting, laid out for reading by newgrad.ai with the wording unchanged. Check the original before you apply. --- More new-grad and intern roles: https://newgrad.ai/llms.txt