Senior Mechanical Engineer, OCS

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 optomechanical and optoelectronic packages for the Optical Circuit Switch (OCS) program. You will work closely with photonics, packaging, process, test, quality, supply chain, and external manufacturing partners to translate OCS architecture and requirements into buildable, manufacturable, and verifiable package designs. Strong design skills incorporating mechanics of materials, thermodynamics, electronics integration, optical alignment, and precision design principles are a must. Responsibilities: Ownership of OCS package and subassembly designs from prototype through production readiness. Expertise in Design for Manufacturability, Design for Assembly, and supplier-ready build documentation. Expertise with GD&T for precision optomechanical interfaces, datums, fixtures, and inspection plans. Expertise with tolerance analysis methods for optical alignment, mechanical stack-up, FAU attach, and package interfaces. Generate and maintain OCS process flow documentation, build travelers, and assembly sequence definition. Conduct DFMEA, PFMEA, CTQ mapping, and risk analysis heat maps for OCS package and process development. Fixture design & fabrication for alignment, attach, metrology, handling, and production build support. Test set-up design & fabrication for optical, mechanical, thermal, and process verification activities. Generate & maintain BOM’s, build standards, material callouts, and configuration-controlled package documentation. Generate & maintain Specification & Drawing Trees for OCS package, subassembly, fixture, and supplier documentation. Ability to execute basic structural, thermal, warpage, and tolerance analyses to down-select designs and reduce build risk. Comfortable with PDM / Arena, ECO discipline, drawing release, supplier documentation packages, and revision control. Experience/Qualifications: Strong communication & interpersonal skills across engineering, operations, quality, and supplier teams. Willin