Senior Mechanical Design Engineer

PsiQuantum • Milpitas, CA

6h

About The Position

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. The Senior Mechanical Design Engineer is responsible for designing highly complex and cutting-edge optomechanical and optoelectronic packages. You will be working closely with teams across a wide array of disciplines, and you will be expected to apply DfM principles on an everyday basis. Strong design skills incorporating mechanics of materials, thermodynamics, electronics, and precision design principles are a must.

Requirements

• Strong communication & interpersonal skills
• Willingness to support colleagues to achieve team objectives
• Exercises independent Judgement
• Continuous learning mindset
• Execution of deliverables against schedule & quality targets
• Experience with subcontractor management
• Master’s Degree or above in Mechanical Engineering or a relevant discipline
• 2-5 years of experience, with a focus on optomechanical design and/or optoelectronic packaging

Responsibilities

• Ownership of designs from prototype to production
• Expertise in Design for Manufacturability, Design for Assembly
• Expertise with GD&T
• Expertise with tolerance analysis methods
• Generate and maintain process flow documentation
• Conduct DFMEA, PFMEA & risk analysis heat maps
• Fixture design & fabrication
• Test set-up design & fabrication
• Generate & maintain BOM’s & build standards
• Generate & maintain Specification & Drawing Trees
• Ability to execute basic structural and thermal analyses to down-select designs
• Comfortable with PDM / Arena

What This Job Offers

• Job Type: Full-time
• Career Level: Senior
• Number of Employees: 251-500 employees