Senior System Integration 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 System Integration Engineer drives and supports design and execution of optical systems. This role is responsible for developing and supporting electro-optical system designs for the purpose of putting complete working systems together. Responsibilities: System integration of electro-optic boxes and components through racks, ducts and cryostats. Develop and document requirements for system level behaviors. Support the design and integration of room temperature electro-optic boxes. Define overall system connectivity for complex systems and subsystems. Rack layout design, documentation, bring up procedures. Design of smaller subsystems to enable validation of boxes and subsystems. Write and maintain connectivity and integration documentation. Maintain rack and top-level system designs, including optical and electrical connectivity BOMs. Python scripting, calling Controls SW APIs / drivers to control lab equipment and proprietary systems. Coordinate cross-functionally to meet requirements and schedule with System Design leads, Electronics Design, Validation, System Commissioning, System Architecture, and Quantum Operating Software teams. Adapt to new challenges and develop new skills to suit the task at hand. Other duties and responsibilities as assigned. Experience/Qualifications: Required: M.S. or PhD in Physics, Optical or Electrical Engineering with 5+ years industry experience. 3+ years industry experience designing and integrating optical systems. Expertise in cross-functional product development. Experience in complex system integration and fiber networking. Experience working with optical test equipment including power meters, optical backscatter reflectometers (OBR), optical spectrum analyzer (OSA). Strong organizational skills, excellent communication skills, attention to detail and ability to multitask. Strong critical thinking, creative, innovative, analytical, and detail oriented problem-solving skill. Ability to work independently with limited direction. Preferred: Expertise wit