OPT Mechanical Engineering Intern Jobs
Mechanical Engineering Intern roles are among the most common OPT-eligible positions for engineering graduates. Most qualify as specialty occupations under F-1 OPT, and STEM OPT extensions apply to mechanical engineering degrees, giving you up to three years of authorized work experience.
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Get Access To All JobsAt d-Matrix, we are focused on unleashing the potential of generative AI to power the transformation of technology. We are at the forefront of software and hardware innovation, pushing the boundaries of what is possible. Our culture is one of respect and collaboration.
We value humility and believe in direct communication. Our team is inclusive, and our differing perspectives allow for better solutions. We are seeking individuals passionate about tackling challenges and are driven by execution. Ready to come find your playground? Together, we can help shape the endless possibilities of AI.
Summer 2026 Intern – Thermal & Mechanical Engineering
Location: Santa Clara, CA (On-site)
Team: Hardware Engineering / Systems Architecture
Dates: June 2nd - August 21st or June 22nd - September 11th
About the Role
At d-matrix, we are pushing the boundaries of AI compute efficiency. High-performance AI silicon generates significant heat, and our mission is to ensure our platforms remain cool and reliable under the most intense LLM inference workloads.
As a Thermal & Mechanical Engineering Intern, you will play a hands-on role in the physical realization of our hardware. You will transition between the CAD environment and the R&D lab, helping us build the infrastructure required to validate our next-generation liquid and air-cooled systems.
Key Responsibilities
- Lab Infrastructure & Setup: Assist in the foundational setup of the Thermal and Mechanical R&D lab. This includes organizing high-power test benches and installing specialized sensing equipment.
- Hardware Validation: Figure out and document the procedures to power and run PCIe accelerator cards in a standalone environment for thermal stress testing.
- Wind Tunnel Testing: Execute rigorous aerodynamic characterization using a wind tunnel. You will measure pressure drop and thermal performance across multiple PCIe cards to generate a high-fidelity statistical dataset for our architecture team.
- Thermal Modeling: Support the development of CFD (Computational Fluid Dynamics) models. Using Simcenter Flotherm, you will create detailed models of individual components (ASICs, VRMs, Optics) and full-system airflow profiles.
- Test Engineering: Prepare laboratory test setups and prepare test samples (including thermocouple attachment and TIM application) for thermal characterization.
- Documentation: Create "Gold Standard" documentation for laboratory procedures and maintain meticulous records of all experimental test data.
Required Qualifications
- Education: Currently pursuing a BS, MS, or PhD in Mechanical Engineering or a related field.
- CFD Foundations: Exposure to thermal simulation software (ideally Flotherm, Icepak, or SolidWorks Flow Simulation).
- Hands-on Aptitude: Comfort working with lab equipment, including thermal data loggers (DAQs), flow sensors, and high-power lab supplies.
- Analytical Mindset: Ability to take raw lab data and perform statistical analysis to identify performance trends and marginalities.
- Attention to Detail: Precision in laboratory work—from the exact placement of a thermocouple to the version control of a simulation model.
Preferred Skills
- Understanding of PCIe form factors and data center cooling requirements.
- Experience with 3D CAD modeling (SolidWorks, Pro/E, or NX).
- Familiarity with heat sink design and Thermal Interface Materials (TIM).
What You Will Gain
- End-to-End Experience: See a thermal design move from a Flotherm model to a physical wind tunnel test.
- Industry Impact: Contribute directly to the thermal integrity of hardware that will power the next generation of LLMs.
- Mentorship: Work side-by-side with senior hardware designers and architects who have built world-class systems at scale.
Equal Opportunity Employment Policy
d-Matrix is proud to be an equal opportunity workplace and affirmative action employer. We’re committed to fostering an inclusive environment where everyone feels welcomed and empowered to do their best work. We hire the best talent for our teams, regardless of race, religion, color, age, disability, sex, gender identity, sexual orientation, ancestry, genetic information, marital status, national origin, political affiliation, or veteran status. Our focus is on hiring teammates with humble expertise, kindness, dedication and a willingness to embrace challenges and learn together every day.
d-Matrix does not accept resumes or candidate submissions from external agencies. We appreciate the interest and effort of recruitment firms, but we kindly request that individuals interested in opportunities with d-Matrix apply directly through our official channels. This approach allows us to streamline our hiring processes and maintain a consistent and fair evaluation of all applicants. Thank you for your understanding and cooperation.
At d-Matrix, we are focused on unleashing the potential of generative AI to power the transformation of technology. We are at the forefront of software and hardware innovation, pushing the boundaries of what is possible. Our culture is one of respect and collaboration.
We value humility and believe in direct communication. Our team is inclusive, and our differing perspectives allow for better solutions. We are seeking individuals passionate about tackling challenges and are driven by execution. Ready to come find your playground? Together, we can help shape the endless possibilities of AI.
Summer 2026 Intern – Thermal & Mechanical Engineering
Location: Santa Clara, CA (On-site)
Team: Hardware Engineering / Systems Architecture
Dates: June 2nd - August 21st or June 22nd - September 11th
About the Role
At d-matrix, we are pushing the boundaries of AI compute efficiency. High-performance AI silicon generates significant heat, and our mission is to ensure our platforms remain cool and reliable under the most intense LLM inference workloads.
As a Thermal & Mechanical Engineering Intern, you will play a hands-on role in the physical realization of our hardware. You will transition between the CAD environment and the R&D lab, helping us build the infrastructure required to validate our next-generation liquid and air-cooled systems.
Key Responsibilities
- Lab Infrastructure & Setup: Assist in the foundational setup of the Thermal and Mechanical R&D lab. This includes organizing high-power test benches and installing specialized sensing equipment.
- Hardware Validation: Figure out and document the procedures to power and run PCIe accelerator cards in a standalone environment for thermal stress testing.
- Wind Tunnel Testing: Execute rigorous aerodynamic characterization using a wind tunnel. You will measure pressure drop and thermal performance across multiple PCIe cards to generate a high-fidelity statistical dataset for our architecture team.
- Thermal Modeling: Support the development of CFD (Computational Fluid Dynamics) models. Using Simcenter Flotherm, you will create detailed models of individual components (ASICs, VRMs, Optics) and full-system airflow profiles.
- Test Engineering: Prepare laboratory test setups and prepare test samples (including thermocouple attachment and TIM application) for thermal characterization.
- Documentation: Create "Gold Standard" documentation for laboratory procedures and maintain meticulous records of all experimental test data.
Required Qualifications
- Education: Currently pursuing a BS, MS, or PhD in Mechanical Engineering or a related field.
- CFD Foundations: Exposure to thermal simulation software (ideally Flotherm, Icepak, or SolidWorks Flow Simulation).
- Hands-on Aptitude: Comfort working with lab equipment, including thermal data loggers (DAQs), flow sensors, and high-power lab supplies.
- Analytical Mindset: Ability to take raw lab data and perform statistical analysis to identify performance trends and marginalities.
- Attention to Detail: Precision in laboratory work—from the exact placement of a thermocouple to the version control of a simulation model.
Preferred Skills
- Understanding of PCIe form factors and data center cooling requirements.
- Experience with 3D CAD modeling (SolidWorks, Pro/E, or NX).
- Familiarity with heat sink design and Thermal Interface Materials (TIM).
What You Will Gain
- End-to-End Experience: See a thermal design move from a Flotherm model to a physical wind tunnel test.
- Industry Impact: Contribute directly to the thermal integrity of hardware that will power the next generation of LLMs.
- Mentorship: Work side-by-side with senior hardware designers and architects who have built world-class systems at scale.
Equal Opportunity Employment Policy
d-Matrix is proud to be an equal opportunity workplace and affirmative action employer. We’re committed to fostering an inclusive environment where everyone feels welcomed and empowered to do their best work. We hire the best talent for our teams, regardless of race, religion, color, age, disability, sex, gender identity, sexual orientation, ancestry, genetic information, marital status, national origin, political affiliation, or veteran status. Our focus is on hiring teammates with humble expertise, kindness, dedication and a willingness to embrace challenges and learn together every day.
d-Matrix does not accept resumes or candidate submissions from external agencies. We appreciate the interest and effort of recruitment firms, but we kindly request that individuals interested in opportunities with d-Matrix apply directly through our official channels. This approach allows us to streamline our hiring processes and maintain a consistent and fair evaluation of all applicants. Thank you for your understanding and cooperation.
See all 327+ OPT Mechanical Engineering Intern Jobs
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Get Access To All JobsTips for Finding OPT Sponsorship as a Mechanical Engineering Intern
Confirm your degree field matches the role
Mechanical engineering internships require a directly related degree to satisfy OPT's specialty occupation standard. A degree in mechanical, manufacturing, or aerospace engineering typically aligns. General engineering or unrelated STEM degrees may require documentation to establish the connection.
Apply before your OPT start date
Many employers won't extend offers to students whose OPT hasn't started yet. Apply 2 to 3 months before your authorization begins so your start date aligns with both your EAD and the employer's onboarding timeline without gaps.
Target employers familiar with OPT
Large engineering firms, aerospace contractors, and automotive manufacturers regularly hire OPT students and understand EAD-based authorization. Smaller startups may hesitate. Prioritize companies with established university recruiting programs, as they're accustomed to navigating student work authorization.
Address STEM OPT eligibility upfront
Mechanical engineering is a STEM-designated field, meaning you qualify for a 24-month STEM OPT extension. Mentioning this during interviews signals 3 years of potential work authorization, which meaningfully reduces perceived hiring risk for the employer.
Prepare your EAD and employment paperwork
Employers will need your EAD card, an offer letter confirming the role qualifies, and a completed E-Verify check. Have your EAD card number and expiration date ready before your first day to avoid onboarding delays at large firms.
Log all employment details for your DSO
OPT requires you to report your employer's name, address, and job start date to your Designated School Official within 10 days of starting. Mechanical engineering internships must be directly related to your degree, so keep documentation showing the connection.
Mechanical Engineering Intern OPT: Frequently Asked Questions
Does a Mechanical Engineering Intern role qualify for OPT work authorization?
Yes, mechanical engineering internships qualify for OPT as long as the role is directly related to your degree. Positions involving CAD design, thermodynamics, materials testing, or manufacturing systems clearly align with a mechanical engineering program. You'll need to confirm this with your DSO and document the connection in your OPT reporting.
Can I use my STEM OPT extension for a Mechanical Engineering Intern position?
Yes. Mechanical engineering is on the official STEM Designated Degree Program List, so a qualifying internship can be authorized under the 24-month STEM OPT extension. Your employer must be enrolled in E-Verify, and you'll need a formal training plan submitted through your school. This gives you up to three years of total OPT-authorized work.
How do I find Mechanical Engineering Intern jobs that accept OPT students?
Migrate Mate is built specifically for F-1 OPT students and lists mechanical engineering internships from employers that accept OPT and STEM OPT work authorization. Filtering by visa type saves significant time compared to applying broadly and discovering late in the process that a company won't sponsor or accept EAD-based authorization.
What happens to my OPT if my mechanical engineering internship ends early?
If your internship ends before your OPT authorization expires, you enter a 60-day grace period during which you can find new employment or prepare to change status. You're not authorized to work during this period. Report the employment end date to your DSO promptly, and begin searching for your next qualifying position immediately.
Do mechanical engineering internships at small companies count toward OPT requirements?
Yes, company size doesn't affect OPT eligibility. What matters is that the role is directly related to your degree and constitutes at least 20 hours of work per week. For STEM OPT extensions, the employer must also be enrolled in E-Verify regardless of size. Many smaller engineering firms and startups do participate in E-Verify, so it's worth confirming before accepting an offer.