Flex Injection Molding Engineer Jobs in California

The Injection Molding Process Technician sets up and operates injection molding machines and related automation to produce high-quality plastic parts that meet all specifications. This role focuses on machine setup, process monitoring, troubleshooting, and preventative maintenance, while closely collaborating with Quality and Engineering teams to resolve any non-conforming or defective product issues.

• Perform complete injection molding machine setups for all molds across all machine types and produce parts that consistently pass quality inspections.
• Ensure parts conform to specifications by following tip sheets, tolerance deviations, and part prints.
• Set up and troubleshoot robots, pickers, and end-of-arm tooling to support automated part handling.
• Mold first-article parts as needed to validate new setups and processes.
• Observe and monitor machine parameters during production runs to verify consistency of temperatures, pressures, press-cycle times, and other key process variables.
• Perform in-machine preventative maintenance on molds, including cleaning and greasing according to established protocols.
• Use precision inspection equipment such as calipers, micrometers, depth gauges, plug gauges, and scales to verify that parts meet dimensional and tolerance requirements.
• Respond to molding machine alarms, clear runners, and resolve processing problems and stuck-part issues to minimize downtime.
• Troubleshoot and adjust molding parameters within defined tolerance limits to maintain product quality and production output.
• Identify the root cause of molding problems and implement appropriate corrective actions to prevent recurrence.
• Train other technicians in mold setups, machine startups, and troubleshooting practices as needed.
• Work closely with Quality and Engineering teams to investigate and resolve non-conforming and defective product occurrences.
• Perform machine and mold preventative maintenance activities as required.
• Carry out other related duties as assigned to support safe, efficient, and high-quality production.

• Minimum two (2) years of experience in maintenance or similar work using tools and machinery related to plastic injection molding.
• Hands-on experience operating and setting up injection molding machines.
• Proficiency in production, packaging, and inspection processes within a manufacturing environment.
• Strong troubleshooting skills for plastic injection molding equipment and processes.
• Ability to read, understand, and communicate in English to follow documented procedures, current specifications, and complex work instructions.
• Ability to calculate ratios, unit-of-measure conversions, and surface area dimensions for machine tonnage settings.
• Solid understanding of machines and tools, including their uses and maintenance in an injection molding setting.
• Ability to operate injection molding machines and auxiliary equipment such as chillers and thermolators.
• Competence using precision inspection tools including calipers, micrometers, depth gauges, plug gauges, and scales.

• Experience working with plastic injection molding processes in a production environment.
• Comfort working with automation equipment such as robots, pickers, and end-of-arm tooling.
• Ability to collaborate effectively with cross-functional teams, including Quality and Engineering.
• Willingness to train and mentor other technicians when needed.
• Strong attention to detail and commitment to maintaining high quality standards.
• Ability to perform consistent lifting of up to 10 pounds throughout the shift.

This opportunity offers long-term stability in a small, supportive team environment where you can build deep technical expertise. You will have the chance to cross-train and gain broad exposure to operations in a warehouse that ships both domestically and internationally, expanding your skills and experience. The culture emphasizes collaboration, learning, and flexibility, including opportunities for overtime when available, while still maintaining a predictable core schedule.

This role is based in a manufacturing environment that is loud and not air-conditioned, with typical loud manufacturing noises present throughout the shift. The position operates on second shift, from 2:00 p.m. to 10:30 p.m., with a shift differential offered for second shift work. Daily overtime may be available as needed but is not mandatory, and the standard workday is approximately eight hours. The work involves constant lifting of up to 10 pounds and regular interaction with injection molding machines, robots, pickers, end-of-arm tooling, and auxiliary equipment such as chillers and thermolators.

This is a Contract to Hire position based out of Oceanside, CA.

The pay range for this position is $35.00 - $40.00/hr.

Eligibility requirements apply to some benefits and may depend on your job classification and length of employment. Benefits are subject to change and may be subject to specific elections, plan, or program terms. If eligible, the benefits available for this temporary role may include the following: • Medical, dental & vision • Critical Illness, Accident, and Hospital • 401(k) Retirement Plan – Pre-tax and Roth post-tax contributions available • Life Insurance (Voluntary Life & AD&D for the employee and dependents) • Short and long-term disability • Health Spending Account (HSA) • Transportation benefits • Employee Assistance Program • Time Off/Leave (PTO, Vacation or Sick Leave)

This is a fully onsite position in Oceanside,CA.

This position is anticipated to close on Aug 25, 2026.

Aerotek® Inc. provides staffing and services solutions in manufacturing, logistics, construction, aviation, facilities and maintenance. We provide the expertise, solutions and people required to rise to the challenges of North American industry. Headquartered in Hanover, Md., Aerotek operates a unified network of over 200 offices across North America, supporting more than 18,000 clients each year. Aerotek is an Allegis Group company, the global leader in workforce and business solutions. To learn more, visit: Aerotek.com | 1-888-AEROTEK.

Aerotek offers weekly pay, employee benefits including medical, dental & vision, life insurance, health advocacy and employee assistance programs, a 401(k) plan, and employee discounts.

The company is an equal opportunity employer and will consider all applications without regards to race, sex, age, color, religion, national origin, veteran status, disability, sexual orientation, gender identity, genetic information or any characteristic protected by law.

San Francisco Fair Chance Ordinance:
Pursuant to the San Francisco Fair Chance Ordinance, for all positions located in the city and county of San Francisco, we will consider for employment qualified applicants with arrest and conviction records.

Massachusetts Lie Detector:
It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability.

Use of Artificial Intelligence (AI):
We may use Artificial Intelligence (AI) to support parts of our hiring process, including sourcing, screening, and evaluating candidates. AI helps assess applications and qualifications, but final decisions are made by our hiring team. By applying, you acknowledge and agree that your application may be reviewed using AI tools.

We know that finding work is hard, and finding meaningful work is harder. Aerotek connects 180,000+ light industrial and skilled trades workers with 14,000+ employers each year, helping our workers navigate an evolving labor market and find jobs that meet their goals, skills, and interests. Since 1983, we have provided a variety of career opportunities across North American industry – from short-term assignments at Fortune 500 companies where you can build your skills, to long-term opportunities where you can play a vital role in solving companies’ construction, manufacturing, and maintenance challenges. Our 1,500+ experienced recruiters across 250+ offices work relentlessly to put our workforce in a position to thrive. Let us rise to meet your challenges and put our people-are-everything spirit to the test as your career continues to grow.