Senior Machinist - Tooling and Fabrication

We are seeking a highly experienced Senior Machinist to join our Tooling and Fabrication team in Simi Valley, CA. In this role, you will set up and operate a wide range of standard and advanced machining equipment to produce both metallic and non-metallic components. Responsibilities include programming and operating CNC equipment, including Hybrid CNC mills, as well as working with manual mills, lathes, grinders, bandsaws, and additional fabrication equipment as needed.

The ideal candidate will possess strong knowledge of machining techniques, tooling, materials, and precision layout methods.

This position offers a competitive hourly rate of $35–$40, depending on experience, and provides the opportunity to contribute within a fast‑paced automation manufacturing environment. Our comprehensive benefits package includes Medical, Dental, Vision, 401(k), Life Insurance, Health Savings Account, Flexible Spending Account, Competitive Compensation, and Paid Time Off. Join a team that values innovation, craftsmanship, and continuous professional growth.

Since 1977, ATC has been redefining what's possible in industrial automation. From concept to commissioning, we partner with leading brands across the globe to design and deliver custom machinery that drives efficiency, precision, and long‑term performance. Our automation expertise spans critical industries that shape the way we live and move — Life Science, Transportation, Consumer Products, and General Industry.

• Read and interpret engineering drawings, blueprints, and specifications to determine dimensions and tolerances.
• Program, set up, and operate HAAS CNC machines and Hybrid CNC milling equipment.
• Set up and run manual/conventional machining equipment, including mills and lathes.
• Machine, grind, and finish components to precise specifications.
• Design, fabricate, and install fixtures, tooling, and related accessories.
• Select proper cutting tools and determine feeds and speeds based on material requirements.
• Inspect completed parts using precision measuring instruments such as micrometers, calipers, and height gauges.
• Utilize computer systems to access files, print drawings, and review 3D models using software such as eDrawings.
• Apply a minimum of 5 years of CAD/CAM experience (Mastercam or RhinoCAM preferred).
• Complete assignments directed by the Working Foreman and collaborate effectively with team members.

• Moderate to high noise levels due to operating machinery and equipment.
• Exposure to moving mechanical components and typical machine shop hazards.

• Ability to stand for prolonged periods throughout the workday.
• Ability to lift and move:
  • Up to 50 lbs occasionally
  • Up to 25 lbs frequently
  • Up to 10 lbs continuously
• Frequent use of hands and fingers to handle tools and materials.
• Ability to bend, push, pull, and reach overhead as needed.

• High school diploma or equivalent required.
• 7–10 years of hands‑on machining experience, including manual machining.
• 5–8 years of CNC programming and machine operation experience.

• Vocational or technical certification in machining or fabrication.
• 5–10 years of experience in a machining or fabrication environment.
• Strong mathematical aptitude and mechanical troubleshooting skills.
• Excellent verbal and written communication abilities.
• Advanced blueprint reading and 3D model interpretation skills.
• Strong problem‑solving mindset and team‑oriented approach.
• Ability to prioritize multiple tasks and perform effectively in a fast‑paced environment.

• Professional and effective communication skills.
• Positive attitude with a strong work ethic.
• Reliable attendance and punctuality.
• Ability to follow instructions and work independently or collaboratively.
• Highly organized and detail‑oriented.
• Capable of maintaining efficiency in a high‑production setting.
• Flexible and willing to take on additional responsibilities when needed.

• Extensive understanding of feeds and speeds for various cutting tools, including:
  • End mills
  • Drills
  • Reamers
  • Shell mills
• Ability to estimate machining times for:
  • Basic profile…