Internship Cnc Machine Shop Jobs in Riverside, CA

Mastercam CNC Programmer

Job Description

This full-time, on-site role focuses on creating and optimizing CNC programs, performing first-piece setups, and supporting both milling and mill turn operations in a precision machine shop environment. You will work extensively with Mastercam for 4- and 5-axis milling and mill turn lathes, ensuring accurate setups, smooth workflow, and high-quality output across a diverse mix of defense and aerospace components. Success in this role requires strong technical expertise, hands-on machining experience, and the ability to collaborate effectively with operators, engineering, inspection, and assembly teams.

Responsibilities

• Review technical drawings, 3D models, and specifications to assess manufacturability and define optimal machining strategies.
• Program CNC machines using Mastercam, with a primary focus on 4- and 5-axis milling and mill turn lathes.
• Perform machine setups and complete first article inspections for each operation to validate programs and processes.
• Operate CNC machines during periods of lower programming demand to support production needs.
• Support machine operators by clarifying programming intent, answering questions, and ensuring clear communication on process requirements.
• Collaborate closely with engineering, inspection, and assembly teams to ensure product quality and adherence to specifications.
• Ensure machined components meet established cycle time, cost, and quality targets.
• Assist in developing tooling strategies, workholding solutions, and process improvements to enhance efficiency and repeatability.
• Complete root cause analysis and corrective action reports when issues arise, and implement corrective measures.
• Provide leadership, mentorship, and training to team members to build programming and machining capability.
• Help stabilize and support hybrid/toolmaker and special projects areas by contributing technical expertise and process guidance.
• Maintain compliance with ITAR regulations and company quality standards at all times.
• Support adherence to internal and customer schedule requirements, including overtime as needed.

Essential Skills

• At least 5 years of CNC programming experience using Mastercam, including 4- and 5-axis milling and mill turn lathes.
• At least 5 years of CNC machining experience, including machine operation and setup knowledge.
• Proficiency in Mastercam programming for complex parts and multi-axis operations.
• Ability to interpret technical drawings, blueprints, GD&T, and manufacturing specifications accurately.
• Ability to review and work from 3D models (SolidWorks) and 2D drawings (AutoCAD or similar).
• Experience performing first article inspections and verifying parts against drawings and specifications.
• Hands-on experience with mills, lathes, and CNC machining centers in a production environment.
• Strong problem-solving skills and attention to detail in both programming and machining.
• Demonstrated ability to collaborate effectively with inspection, operators, and engineering departments.
• Ability to work independently while also contributing effectively within cross-functional teams.
• Commitment to meeting internal and customer schedule requirements and production deadlines.

Additional Skills & Qualifications

• Experience with mill-turn equipment and complex multi-axis machining strategies.
• Familiarity with Epicor ERP or similar enterprise resource planning systems.
• Experience conducting or supporting root cause and corrective action investigations.
• Exposure to hybrid/toolmaker work and special projects that require creative fixturing and process development.
• Comfort working directly on the shop floor and engaging with production teams in real time.
• Strong communication skills to clearly explain programming decisions and process changes to operators and other stakeholders.
• Solid understanding of inspection methods and quality assurance practices related to CNC machining.
• Experience with defense and aerospace components or other high-precision, high-compliance industries.

Why Work Here?

You will join a hands-on, collaborative machine shop environment where your programming expertise directly influences product quality and on-time delivery. The organization values cross-functional teamwork, continuous improvement, and knowledge sharing, giving you the opportunity to mentor others and shape machining processes. You will work with advanced multi-axis equipment and modern software tools, with the chance to contribute to complex, high-impact projects in a stable and growing operation.

Work Environment

This role is based on-site in a machine shop environment, working primarily with CNC mills, lathes, and multi-axis equipment. The standard shift runs from 6:00 AM to 2:30 PM, with overtime available as needed to support production and schedule requirements. You will spend most of your time on the shop floor, moving between programming stations, machines, and inspection areas, and working closely with operators, engineering, and quality teams. The environment is fast-paced and production-focused, with an emphasis on safety, precision, and adherence to ITAR and company quality standards. Appropriate shop attire and adherence to safety procedures and protective equipment requirements are expected.

Job Type & Location

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

Pay and Benefits

The pay range for this position is $40.00 - $58.00/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)

Workplace Type

This is a fully onsite position in Irvine,CA.

Application Deadline

This position is anticipated to close on Jul 24, 2026.

About Aerotek

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.