Mechanical Engineer Intern

Job Title: Mechanical Engineer Intern

Job Type: Summer 2026 Internship

Job Location: Simi Valley, CA OR San Leandro, CA (This position is 100% onsite)

Business Unit: Randtron

Schedule:9/80: Employees work 9 out of every14 days – totaling 80 hours worked – and have every other Friday off.

About Fisica Inc.

Fisica, Inc. is a premier manufacturer of advanced defense products, specializing in the design and production of airborne and ground-based antennas, as well as cutting-edge electromagnetic systems and simulators. Headquartered in San Leandro, California, with additional operations in Simi Valley, Fisica plays a vital role as a trusted partner to leading defense primes and the U.S. Department of Defense.

Our company operates as - ATI, Randtron, Datron and Space Vector—each bringing deep expertise and innovation to the defense sector. Led by a seasoned management team, Fisica is committed to excellence in engineering, manufacturing, and mission-critical solutions that enhance national security.

At Fisica, we foster a strong, collaborative work culture that values individual contributions and empowers our employees. Our commitment to innovation, integrity, and teamwork makes us a leader in the defense industry and an exceptional place to build a career.

Overall Summary

We are seeking a motivated and hands-on Mechanical Engineering Intern to join our dynamic engineering team for the Summer of 2026. This internship offers a unique opportunity to apply classroom knowledge to real-world projects, work alongside experienced engineers, and gain invaluable industry experience in the aerospace and defense sector. The ideal candidate has a basic understanding of mechanical and/or electro-mechanical disciplines and is eager to learn in a fast-paced, collaborative environment. The internship will take place in the summer of 2026 with flexibility for a May or June start time.

Key Responsibilities

As a Mechanical Engineering Intern, you will work under the guidance of a mentor and assist engineering teams with a variety of tasks. Your responsibilities may include:

• Participate in the design, development, and analysis of mechanical components and systems for aerospace applications, including high-energy pulsed power systems, large ground-based satellite antennas, military aircraft antennas, and/or space batteries systems.
• Create and modify 3D CAD models and generate technical drawings in accordance with industry drafting standards.
• Participate in prototype fabrication, assembly, and testing.
• Perform laboratory activities including test planning, execution, data acquisition, and analysis.
• Perform basic engineering calculations (structural and thermal analysis) using hand-calcs and/or simulation tools to support design efforts.
• Collaborate with other functional teams (electrical, physics, manufacturing) on design, research, and development projects.
• Document design progress, test results, and engineering processes through technical reports and presentations.
• In-Office Work Required.
  
  

Education And Experience Required

• Candidates must be currently pursuing a bachelor’s degree in mechanical engineering, aerospace engineering, or a related technical field.
• Minimum GPA of 3.0.
• A basic understanding of fundamental mechanical engineering principles.
• Basic proficiency with 3D CAD software.
• Enjoy hands-on mechanical work and a willingness to work in both an office and R&D lab environment.
• Strong problem-solving abilities, attention to detail, and an inquisitive nature.
• Excellent written and verbal communication skills.
• Ability to work effectively in a team environment.
• The ability to obtain a future Security Clearance is required for the role. U.S. citizenship is required, as only U.S. citizens are eligible for a security clearance.
  
  

Benefits & Opportunities

• Gain real-world, impactful experience on cutting-edge aerospace and defense technology.
• Opportunity for mentorship from industry veterans and experts.
• Competitive compensation package and potential eligibility for full-time employment offers upon graduation.
• Exposure to a wide range of engineering processes from concept to production manufacturing and testing.
  
  

In compliance with pay transparency requirements, the salary range for this role is $28.00/hr. - $35.00/hr. This is not a guarantee of compensation or salary, as the final offer amount may vary based on factors including but not limited to experience and geographic location.

EEO Statement

Fisica is proud to be an Equal Opportunity Employer. Fisica is committed to treating all employees and applicants for employment with respect and dignity and maintaining a workplace that is free from unlawful discrimination. All applicants will be considered for employment without regard to race, color, religion, age, national origin, ancestry, ethnicity, gender (including pregnancy, childbirth, breastfeeding or other related medical conditions), gender identity, gender expression, sexual orientation, marital status, military and veteran status, disability, genetic information, citizenship status, characteristic or membership in any other group protected by federal, state or local laws. Fisica maintains a drug-free workplace and performs pre-employment substance abuse testing and background checks, where permitted by law.

Fisica is an E-Verify Employer. Please click here for the E-Verify Poster in English or Spanish. For information regarding your Right To Work, please click here for English or Spanish .