Senior Mechanical Design Engineer

PsiQuantum's mission is to build the first useful quantum computers-machines capable of delivering the breakthroughs the field has long promised. Since our founding in 2016, our singular focus has been to build and deploy million-qubit, fault-tolerant quantum systems.

Quantum computers harness the laws of quantum mechanics to solve problems that even the most advanced supercomputers or AI systems will never reach. Their impact will span energy, pharmaceuticals, finance, agriculture, transportation, materials, and other foundational industries.

Our architecture and approach is based on silicon photonics. By leveraging the advanced semiconductor manufacturing industry-including partners like GlobalFoundries-we use the same high-volume processes that already produce billions of chips for telecom and consumer electronics. Photonics offers natural advantages for scale: photons don't feel heat, are immune to electromagnetic interference, and integrate with existing cryogenic cooling and standard fiber-optic infrastructure.

In 2024, PsiQuantum announced government-funded projects to support the build-out of our first utility-scale quantum computers in Brisbane, Australia, and Chicago, Illinois. These initiatives reflect a growing recognition that quantum computing will be strategically and economically defining-and that now is the time to scale.

PsiQuantum also develops the algorithms and software needed to make these systems commercially valuable. Our application, software, and industry teams work directly with leading Fortune 500 companies-including Lockheed Martin, Mercedes-Benz, Boehringer Ingelheim, and Mitsubishi Chemical-to prepare quantum solutions for real-world impact.

Quantum computing is not an extension of classical computing. It represents a fundamental shift-and a path to mastering challenges that cannot be solved any other way. The potential is enormous, and we have a clear path to make it real.

Come join us.

Job Summary:

The Senior Mechanical Design Engineer is responsible for designing and qualifying the performance of innovative electro-optical subsystems, working closely with electronics packaging, systems integration and edge coupling teams.

Responsibilities

• Ability to work independently with limited direction, in a team environment across functional and organizational boundaries is required.
• Assist with systems architecture development at the sub-system level.
• Perform large or complex portions of projects where responsibility includes definition, completion, technical quality, across teams.
• Provides frequent written and oral presentations, status reports, and updates, for a variety of audiences.
• Ability to accept constructive feedback from resident experts and coordinate communications between different groups
• Serve as mentor to younger engineers
• Ability to distill complex mechanical issues and drive convergence amongst electrical, optical & packaging teams.

Mechanical design work, including

• Strong mechanical design and analysis skills, expertise in GD&T
• Generate & maintain BOM's & build standards
• Generate and maintain process flow documentation
• Integration of CAD files across multiple teams
• Fixture design & fabrication
• Test set-up design & fabrication
• Generating & maintaining a Specification Tree
• Generating & maintaining a Drawing Tree for builds & variants
• Management of builds through the use of PDM / Arena
• Tolerance analysis - RSS & worst case
• DFMEA & risk analysis heat maps
• Input & maintain workflow documentation in MES.
• Perform simple simulations of structural deflections, stresses

Experience/Qualifications:

• Master's Degree in Mechanical Engineering or a relevant discipline.
• Minimum 5 years of experience
• Preferred - 10 years of experience.
• Working knowledge of DfM and design issues associated with volume production, ideally with direct experience.

PsiQuantum provides equal employment opportunity for all applicants and employees. PsiQuantum does not unlawfully discriminate on the basis of race, color, religion, sex (including pregnancy, childbirth, or related medical conditions), gender identity, gender expression, national origin, ancestry, citizenship, age, physical or mental disability, military or veteran status, marital status, domestic partner status, sexual orientation, genetic information, or any other basis protected by applicable laws.

Note: PsiQuantum will only reach out to you using an official PsiQuantum email address and will never ask you for bank account information as part of the interview process. Please report any suspicious activity to

We are not accepting unsolicited resumes from employment agencies.

The ranges below reflect the target ranges for a new hire base salary. One is for the Bay Area (within 50 miles of HQ, Palo Alto), the second one (if applicable) is for elsewhere in the US (beyond 50 miles of HQ, Palo Alto). If there is only one range, it is for the specific location of where the position will be located. Actual compensation may vary outside of these ranges and is dependent on various factors including but not limited to a candidate's qualifications including relevant education and training, competencies, experience, geographic location, and business needs. Base pay is only one part of the total compensation package. Full time roles are eligible for equity and benefits. Base pay is subject to change and may be modified in the future.

U.S. Base Pay Range

$125,000-$145,000 USD

Bay Area Pay Range

$155,000-$185,000 USD