An injection molding process engineer helps a plastics manufacturer develop, stabilize, troubleshoot, and improve the processes used to make molded parts. A useful job description makes clear whether the role owns process development and technical changes, supports production troubleshooting, or does both. Customize the template below to match your equipment, products, quality system, and decision authority.
Copy-and-customize job description
Job title
Injection Molding Process Engineer
Position summary
[Company] is seeking an Injection Molding Process Engineer to develop, document, and improve molding processes for [product or market]. This role works with [engineering, production, quality, tooling, and maintenance teams] to support mold and material trials, resolve process-related issues, and transition approved process changes into stable production. The engineer reports to [title] and is based at [location / facility].
Key responsibilities
- Develop and refine injection molding processes for new programs, new molds, material changes, and approved production improvements.
- Plan and support mold, material, and equipment trials; define the measurements and acceptance criteria with the appropriate engineering and quality partners; document results and recommendations.
- Establish and maintain approved process parameters, setup documentation, troubleshooting guides, and change records in accordance with the facility’s quality system.
- Investigate molding defects and process variation using production data and a structured root-cause approach; coordinate corrective actions with production, quality, tooling, maintenance, and material suppliers as appropriate.
- Assess process performance and recommend practical improvements to repeatability, part quality, cycle consistency, and efficient use of equipment, without compromising approved requirements.
- Support the handoff of new or revised processes to production, including clear instructions and training for the employees responsible for running them.
- Follow site safety, quality, documentation, and change-control requirements, and escalate issues that are outside the role’s authority.
Required qualifications
- [Bachelor’s degree in plastics, manufacturing, mechanical, materials, or a related engineering discipline, or equivalent relevant experience.]
- [X or more years] of experience supporting injection molding processes in a manufacturing environment.
- Working knowledge of molding process variables, mold and material interactions, part-quality requirements, and production troubleshooting.
- Ability to interpret process and quality data, document technical work clearly, and collaborate across production and engineering teams.
- Ability to meet the role’s stated onsite, shift, travel, and physical requirements, if applicable.
Preferred qualifications
- Experience with [specific press controls, materials, mold types, automation, or product sectors used at this facility].
- Experience leading structured trials, process development, design of experiments, or root-cause investigations.
- Familiarity with [the company’s relevant quality standards, documentation system, and customer requirements].
Employer note: Keep the degree and experience requirements tied to the work the person will actually own. If equivalent practical experience is acceptable, say so. List only equipment, materials, standards, and software your facility uses.
Define the role before you post it
“Process engineer” can mean different things from one plant to another. Before publishing, specify whether this person will lead process development and trials, troubleshoot current production, support new-product launches, or cover a defined mix. Clarify which changes the engineer may approve independently and which require review from quality, engineering, or plant leadership.
Also name the processes and products involved: for example, the resin families, press range, mold types, automation, and part requirements that matter at your site. Avoid a wish list of every technology. A focused description gives applicants a clearer picture of the job and helps your team assess relevant experience.
Process engineer or molding technician?
The distinction depends on your plant’s organization, but the job description should show where the work sits. A process engineer commonly owns or develops process methods, plans technical trials, evaluates results, and recommends controlled changes. A molding technician commonly supports setup, operation, monitoring, and troubleshooting within the plant’s established procedures and assigned authority. Some facilities combine duties, so describe the actual responsibilities instead of relying on title alone.
The Society of Plastics Engineers’ injection mold setup and product-trialing workshop covers new-tool trials, material specifications, quality standards, machine and process parameters, defect identification, and troubleshooting. For broader occupational context, the U.S. Department of Labor’s O*NET profile for industrial engineers lists “Process Engineer” among sample titles and describes work involving process design, improvement, quality, and production systems.
Interview questions to assess practical fit
- Walk us through how you would plan a trial for a new mold or material. What would you measure, document, and review before recommending a production change?
- Describe a molding issue you investigated. How did you separate possible material, mold, machine, method, or measurement factors, and how did you verify the corrective action?
- How do you make process documentation useful to the production team and keep approved changes controlled?
- Tell us about a time production results differed from the intended process. How did you work with operators, quality, tooling, or maintenance to resolve it?
- Which molding technologies or materials have you personally worked with, and what was your responsibility?
Ask candidates to avoid confidential information about former employers or customers. Assess their reasoning, documentation habits, collaboration, and experience against the requirements you listed—not against unverified production claims.
A simple hiring scorecard
Before interviews, agree on a consistent rating scale for the role’s essential criteria. A practical scorecard can cover: (1) injection molding process knowledge; (2) trial planning and technical problem-solving; (3) quality and change documentation; (4) communication with production teams; and (5) experience with your specific materials, equipment, or product requirements. Define what a strong answer looks like for each item, then have interviewers record evidence rather than relying on general impressions.
Need help hiring an injection molding process engineer?
A precise description is a useful start. PlasticStaffing supports employers with permanent placement, contingency search, retained and executive search, and Recruiting Subscription Service for plastics and manufacturing roles. Talk with our recruiting team about your hiring need.
