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 highly complex and cutting-edge optomechanical/optoelectronic subsystem assemblies. You will be working closely with teams across a wide array of disciplines including cryogenics, optics, electronics, and manufacturing. 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. 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. • Ability to execute basic structural and thermal analyses to down-select designs. • Practicing proper engineering revision control, preferably with Solidwork PDM / Arena (PLM). Experience/Qualifications: • Experience in designing mechanical assemblies for opto-electronic devices (i.e. optical transceivers or co-packaged optics and/or datacenter switching system. • 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. • 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. • Preferred experience: Design system in cryogenic and vacuum environments is a plus. • Preferred experience: Design for liquid cooling with cold plate assemblies is a plus. 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 recruiting@psiquantum.com. We are not accepting unsolicited resumes from employment agencies.