Senior Mechanical Design Engineer

Entangled Future; Milpitas (CA); Remote; USD 120,000 - 180,000; Full time

Job summary

PsiQuantum, Milpitas, California (remote) is seeking a Senior Mechanical Design Engineer to advance optoelectronic assemblies for datacenter-scale systems. You will own the mechanical design from concept through production, collaborating with optical, electrical, and QA teams to meet performance and reliability goals.

The role requires strong GD&T, tolerance analysis, and DFx experience with a focus on manufacturability and assembly.

Qualifications

• Experience designing mechanical assemblies for optoelectronic devices.
• Expertise in Design for Manufacturability and Design for Assembly.
• Expertise with GD&T.
• Expertise with tolerance analysis methods.
• Strong communication and interpersonal skills.
• Ability to quickly learn and apply new technologies in emerging fields.
• Willingness to support colleagues to achieve team objectives.
• Demonstrated independent judgment.

Skills

Optoelectronic design

GD&T

Tolerance analysis

DFM/ DFA

Mechanical design

Communication

Job description

Senior Mechanical Design Engineer at PsiQuantum, Milpitas, California, United States (remote). A senior-level full time position in the Engineering team, listed under hardware engineering.

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. That approach has since been tested at the highest level of scrutiny the U.S. government applies to emerging technology, and it has held up. In 2025, PsiQuantum closed a $1 billion funding round that valued the company at $7 billion. In 2026, the U.S. Department of Commerce signed a $100 million Letter of Intent under the CHIPS and Science Act, followed by a $125 million agreement with DARPA under Stage C of its Quantum Benchmarking Initiative, PsiQuantum's most valuable U.S. government agreement to date. This year, we also broke ground on our utility-scale quantum computer in Brisbane, Australia, and continued building out our Chicago site. Victor Peng, our CEO, and co-founder Jeremy O'Brien, now Executive Chairman, lead a team and board that reflects how seriously the world is taking this build, joined this year by Intel's Lip-Bu Tan and Atomico's Niklas Zennström. PsiQuantum also develops the algorithms and software needed to make these systems co

Requirements

• Experience designing mechanical assemblies for optoelectronic devices, such as optical transceivers, co-packaged optics, and datacenter switching systems.
• Expertise in Design for Manufacturability, Design for Assembly.
• Expertise with GD&T.
• Expertise with tolerance analysis methods.
• Strong communication and interpersonal skills.
• Ability to quickly learn and apply new technologies and design principles in emerging or unfamiliar fields.
• Willingness to support colleagues in achieving team objectives.
• Demonstrated independent judgment.