Internship Injection Molding Process Engineer Jobs in New Jersey

Roof Penetration Housing (RPH) is a dynamic, rapidly expanding leader in the commercial building products industry, trusted by architects, engineers, contractors, and building owners on a wide range of critical projects—from hospitals and data centers to K-12 schools. Our innovative, engineered solutions prevent roof and wall leaks and ensure storm shelters and safe rooms meet code requirements and protect occupants during severe weather events.

Year to date, RPH has successfully doubled revenue year over year—with momentum showing no signs of slowing. We're experiencing rapid expansion across both our New Jersey and Texas locations, and we're excited to grow our powerhouse team as we continue setting new benchmarks for performance, safety, and success in commercial construction.

This role is a full-time role that directly reports to the New Products Engineering Manager. This role will be hybrid where day-to-day work will occur for 2-3 days in our office located in Waterford Works,New Jersey.

We're seeking a seasoned Process Design Engineer to assist the RPH R&D team with development and optimization of industrial processes involving both plastic and metal components. This role is ideal for a hands‑on engineer with deep experience in thermoplastics, injection molding, metal forming, and finishing operations—focused on improving efficiency, quality, and compliance across manufacturing systems.

You're a hands‑on engineer with a passion for refining complex manufacturing systems. You bring deep technical expertise in thermoplastics, injection molding, and metal forming, and you're driven by the challenge of improving efficiency, quality, and compliance. You think critically, act decisively, and thrive in environments where innovation and precision go hand in hand. You collaborate well across teams, communicate clearly, and enjoy turning engineering challenges into scalable, real‑world solutions.

• Design and optimize process flow diagrams (PFDs) for new products under development by RPH's R&D team.
• Conduct process simulations and modeling for operations such as injection molding, extrusion, stamping, machining, and surface treatment.
• Specify and size equipment including molding machines, presses, CNC systems, dryers, and cooling systems.
• Collaborate with both internal and external materials engineers, mechanical engineers, and operations teams to integrate new technologies and troubleshoot existing processes.
• Ensure compliance with OSHA, EPA, ISO, and ASTM standards relevant to plastics and metalworking.
• Prepare technical documentation including risk assessments, SOPs, and commissioning plans.
• Support continuous improvement initiatives using Lean, Six Sigma, or similar methodologies. Lead IQ/OQ/PQ validations.
• Provide technical guidance to junior engineers and production teams during process implementation and optimization.

• Minimum 7 years of hands‑on experience in process design engineering within plastics and/or metals manufacturing environments.
• Bachelor's or Master's degree in Mechanical, Materials, Chemical or Industrial Engineering.
• Experience with cost estimation, lifecycle planning, and plant retrofits.
• Strong understanding of injection molding, extrusion, heat treatment, welding, and surface finishing processes.
• Proficiency in AutoCAD, SolidWorks.
• Preferred experience in simulation tools like ANSYS, Moldflow, DEFORM, or HYSYS.
• Familiarity with material flow, thermodynamics, and tooling design for both plastic and metal products.
• Excellent analytical, documentation, and cross‑functional communication skills.
• Experience with Lean Six Sigma, or similar methodologies.

• The starting range for this position begins at $90-115,000/yr and may vary based on candidate knowledge, experience, skills, abilities and geographic location.
• The typical working hours for this position are 8 am – 4:30 pm
• Travel is expected for this position up to 10%, which is anticipated to be overnight in several domestic locations. International travel may be required in the future depending on business needs.
• This job position is exempt from overtime as determined by the FLSA standards.

At RPH, we believe in taking care of our team on and off the job. That's why we offer a comprehensive benefits package that includes:

• Employer covered premiums for Medical, Dental, and Vision Insurance – 100% covered for employees, so you can focus on your health without the extra cost.
• 401(k) Retirement Plan & Employer Contribution - RPH contributes a fixed percentage of your pay automatically alongside your contributions to investing in your long‑term success.
• Paid Time Off & Holidays – Enjoy a healthy work‑life balance with generous PTO and paid holidays.
• Life & Disability Insurance – Coverage to help protect you and your loved ones.

• We review resumes, cover letters and submissions sent.
• Candidates are video callscreened by the Human Resources Manager and Hiring Manager.
• From there you can anticipate 1 to 2 additional interviews with the RPH team, with ample communication throughout the entire process.

We love hearing about your career's story and what uniquely qualifies you to join our growing team in your cover letter. RPH is proudly an equal opportunity employer, and we are committed to hiring a diverse workforce. If you have a disability or special need that requires accommodation, please submit an accommodation request. Veterans are encouraged toapply. Employment contingent on successful background checks. Roof Penetration Housing (RPH) participates in E‑Verify.