Senior System Integration Engineer at PsiQuantum in Milpitas, CA

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 reports into the System Design organization. This role is responsible for system connectivity, rack layout design, and overall system readiness and integration to enable system commissioning.

Responsibilities:

• System integration of electro-optic components through racks, ducts and cryostats.
• Define overall system connectivity for complex systems and subsystems.
• Rack layout design, documentation, bring up procedures.
• Support design leads to acquire necessary equipment for subsystem operation and testing.
• 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.
• Write and maintain documentation of system performance.
• 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 validating and testing 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 with advanced fiber optic technologies such as sensing, timing distribution, clock distribution, or submarine telecoms applications.
• Knowledge, expertise and experience with optical transmission systems, laser sources, optical fiber to die coupling technologies.

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.

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

$140,000—$185,000 USD

Bay Area Pay Range

$175,000—$200,000 USD