Senior Mechanical Design Engineer, PsiQuantum

$155-185k

Base pay is only one part of the total compensation package. Full time roles are eligible for equity

Senior and Expert level

San Francisco Bay Area

Office located in Milpitas, CA or Palo Alto, CA

Quantum computer builder

Job no longer available

Quantum computer builder

501-1000 employees

B2BEnterpriseManufacturingDeep TechScience

Job no longer available

$155-185k

Base pay is only one part of the total compensation package. Full time roles are eligible for equity

Senior and Expert level

San Francisco Bay Area

Office located in Milpitas, CA or Palo Alto, CA

501-1000 employees

B2BEnterpriseManufacturingDeep TechScience

Company mission

To build and deploy useful, fault tolerant quantum computers.

Job

Company

Role

Who you are

Master’s Degree in Mechanical Engineering or a relevant discipline
Minimum 5 years of experience
Preferred – 10 years of experience
Working knowledge of DfM and design issues associated with volume production, ideally with direct experience

What the job involves

The Senior Mechanical Design Engineer is responsible for designing and qualifying the performance of innovative electro-optical subsystems, working closely with electronics packaging, systems integration and edge coupling teams
Ability to work independently with limited direction, in a team environment across functional and organizational boundaries is required
Assist with systems architecture development at the sub-system level
Perform large or complex portions of projects where responsibility includes definition, completion, technical quality, across teams
Provides frequent written and oral presentations, status reports, and updates, for a variety of audiences
Ability to accept constructive feedback from resident experts and coordinate communications between different groups
Serve as mentor to younger engineers
Ability to distill complex mechanical issues and drive convergence amongst electrical, optical & packaging teams
Strong mechanical design and analysis skills, expertise in GD&T
Generate & maintain BOM’s & build standards
Generate and maintain process flow documentation
Integration of CAD files across multiple teams
Fixture design & fabrication
Test set-up design & fabrication
Generating & maintaining a Specification Tree
Generating & maintaining a Drawing Tree for builds & variants
Management of builds through the use of PDM / Arena
Tolerance analysis – RSS & worst case
DFMEA & risk analysis heat maps
Input & maintain workflow documentation in MES
Perform simple simulations of structural deflections, stresses

Our take

Quantum computing will change the world more than any other imminent technological development, and PsiQuantum sits at the forefront of the charge to build the first quantum computer that will actually work.

The company is unique for the scale of their ambitions. Rather than focusing on what they term “intermediate milestones” like building smaller proof of concept systems, PsiQuantum builds the first large-scale, error-corrected computer, using photonics to deliver over 1,000,000 qubits (current quantum machines have yet to cross the 1,000 qubit mark).

There are plenty of companies building quantum computers, including the likes of IBM and Google, but these prototypical machines lack the size to correct errors, making them exponentially less useful than what PsiQuantum aims for. While other companies operate in the same sphere, PsiQuantum is unequivocally a leader in its field, founded by world-class academics and recently securing $1B in funding, making it the largest funding round for a quantum computing startup.

Steph

Company Specialist at Welcome to the Jungle

Insights

Top investors

16% employee growth in 12 months

Glassdoor (3.5)

Company

Funding (last 2 of 7 rounds)

Jun 2025

$1bn

GROWTH EQUITY VC

Jun 2024

$125m

CONVERTIBLE

Total funding: $2.7bn

Company benefits

Financial & Retirement: 401(k) with company match, equity grants, and access to financial wellness tools and planning resources.
Health: Competitive health coverage for you and your dependents that go beyond your standard medical, dental & vision.
Wellness: $200 quarterly health reimbursement, 12 therapy + 6 coaching sessions with Modern Health for you and depndents, and annual membership to Care.com.
Time Off: Discretionary Time Off (DTO) for full-time employees in addition to federal holidays and an end-of-year company shut-down.
Family Leave: 12 weeks of paid parental leave with the support of a dedicated leave consultant.
Flexible WOrk: Work in office, hybrid, or remote depending on your team and location.

Company HQ

Palo Alto, CA

Leadership

Jeremy O'Brien

(Co-Founder & CEO)

Prior to founding PsiQuantum, researched and taught at universities across the world, including Bristol, Stanford, Osaka, Sydney and Queensland.

Mark Thompson

(Co-Founder & Chief Technologist)

Previously worked as an R&D Engineer at Toshiba and was a research fellow at the University of Cambridge. Is currently a Professor of Quantum Photonics at Bristol University as well as Chief Technologist at PsiQuantum.

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