Monarch Quantum

Designs and manufactures quantum photonic subsystems

Mechanical Engineer 4

Design EngineeringConfirmed live in the last 24 hours

Full-timeSan Diego, CA, USAIn-person

About the Job

Requirements

A bachelor's degree in mechanical engineering, physics, or a related field is required.
A minimum of 5 years of relevant experience is required, ideally within a startup or technology company.
Extensive expertise in mechanical engineering topics and a solid grasp of the conventional mechanical engineering curriculum are required.
In-depth knowledge of material properties and manufacturing processes, including CNC milling, CNC turning, sheet metal work, injection molding, laser cutting, water jet cutting, and 3D printing for metal and plastic, is required.
Thorough comprehension of design principles for photonic assembly techniques such as die bonding, vacuum reflow soldering, wire bonding, and the use of adhesives is required.
Strong foundational knowledge of structural theory, including static analysis, modal analysis, random vibration, and shock response, is required.
Deep insight into fluid mechanics and heat transfer principles, including conduction, convection, and radiation, is required.
A proven track record completing engineering tasks using mechanical CAD software, quantitative analysis and programming tools, instrumentation and measurement techniques, component fabrication or procurement, systems integration and testing, data collection and analysis using ANSYS Workbench, and documentation is required.
Employment is contingent upon being a U.S. person as defined by 8 U.S.C. § 1324b(a)(3), because the position requires access to export-controlled information.
Creativity, flexibility, comfort wearing multiple hats, passion for building systems from the ground up, and comfort with ambiguity and change are required.

Responsibilities

Design, develop, analyze, document, and support testing of robust, precision opto-mechanical assemblies.
Develop novel laser systems and photonic products for free-space and fiber-coupled single-mode and multimode outputs.
Perform thermal, structural, and vibration modeling of complex opto-mechanical assemblies.
Design flexures for precision motion of optical elements.
Conduct engineering analysis to understand how loads and environmental factors affect performance.
Design and set up optical metrology and perform engineering tests and design of experiments.
Work independently and collaboratively while communicating with the manager, project engineer, and teammates; mentor junior engineers.
Execute complex engineering tasks involving planning, preparation, data and information collection and analysis, and decision-making, with peer reviews and documentation of results.
Ensure accurate execution schedules and data quality and integrity, and conform to company best practices through disciplined work and clear communication and documentation.
Grow competency through mentorship, curiosity, communication, exposure, and initiative.

Desired Qualifications

Experience within a startup or technology company is ideal.
SolidWorks is preferred.
Python is identified as an example of a quantitative analysis and programming tool.

Mechanical Engineer 4

Monarch Quantum · San Diego, United States · Full-time · Posted 2026-09-23

Salary: USD 175,000–225,000

Workplace: on_site

Department: Mechanical Engineering

Description

Join our fast-paced and passionate team as a Mechanical Engineer 4. As we scale, you will be instrumental in building our foundation from the ground up. This is a dynamic, hands-on role for a self-starter who thrives in a fluid startup environment. You'll have the opportunity to work on cutting edge technologies, work closely with leadership, and develop and implement engineering practices that support our mission and growth. Your key responsibilities are as follows:

Design, develop, analyze, document and support testing of robust, precision opto-mechanical assemblies.
Develop novel laser systems and photonic products for both free space and fiber coupled (single & multimode) outputs.
Perform thermal, structural, and vibration modeling of complex opto-mechanical assemblies.
Design of flexures for precision motion of optical elements.
Engineering analysis to understand how loads and environmental factors affect performance.
Design and setup optical metrology and perform engineering tests and design of experiments.
Work independently and in a team while over communicating with the manager, project engineer and the teammates. Will mentor junior engineers.
Execute complex engineering tasks involving planning, preparation, data/information collection and analysis and decision-making in a process involving peer reviews and documentation of the results.
Use tenacity, patience, self-discipline and passion for excellence to assure accuracy of execution schedule, data quality/integrity, conformance to company best practices, clarity in communication and documentation.
Use every opportunity to grow competency thru mentorship, curiosity, communication, exposure and initiative.

Requirements

This position requires access to export-controlled information. Employment is contingent upon the applicant being a U.S. person as defined by 8 U.S.C. § 1324b(a)(3).

Experience:

A bachelor’s degree in mechanical engineering, Physics, or a related field.
Minimum of 5 years of relevant experience, ideally within a startup or technology company.

Skills:

Extensive expertise in various mechanical engineering topics and a solid grasp of the conventional mechanical engineering curriculum.
In-depth knowledge of material properties, manufacturing processes including CNC milling, CNC turning, sheet metal work, injection molding, laser cutting, water jet cutting, and 3D printing (for both metal and plastic).
Thorough comprehension of design principles for photonic assembly techniques such as die bonding, vacuum reflow soldering, wire bonding, and the use of adhesives.
Strong foundational knowledge of structural theory encompassing static analysis, modal analysis, random vibration, and shock response.
Deep insight into fluid mechanics and heat transfer principles, including conduction, convection, and radiation.
Proven track record of successfully completing engineering tasks utilizing mechanical CAD software (SolidWorks preferred), quantitative analysis and programming tools (such as Python), instrumentation and measurement techniques, component fabrication or procurement, systems integration and testing, as well as data collection, analysis (using ANSYS Workbench), and documentation.

Startup Mindset:

You're creative, flexible, and eager to wear multiple hats.
You're passionate about building systems from the ground up and comfortable with ambiguity and change.

Benefits

The expected annual salary range for this position is $175,000-$225,000.

As a full-time employee, you will be eligible for Monarch’s comprehensive benefits package, which includes:

Medical, Dental, and Vision insurance
Fidelity 401(k) plan with 4% employer matching
20 paid time off (PTO) days per year
13 paid company holidays
9/80 work schedule (every other Friday off)

Monarch Quantum is proud to be an equal opportunity employer and does not discriminate on the basis of race, color, citizenship status, national origin, ancestry, sex, sexual orientation, age, religion, creed, physical or mental disability, medical condition, marital status, veteran status or any other characteristics protected under applicable federal, state and local laws.

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About the Company

Monarch Quantum

Designs and manufactures quantum photonic subsystems

Monarch Quantum designs and manufactures Quantum Light Engines, integrated photonic subsystems that replace large laser systems with compact, factory-aligned modules. These modules handle state preparation, cooling, trapping, manipulation, and coherent control to prepare and measure quantum states for computing, sensing, and communications. They operate with a vertically integrated model in San Diego, combining in-house systems engineering, hybrid optical packaging, robotic assembly, and AI-driven manufacturing to enable design-to-volume production under one roof, reducing size, complexity, and integration risk. The company differentiates itself by offering ready-to-integrate modular photonic subsystems for architectures such as trapped-ion, neutral-atom, and photonics-based platforms, targeting hardware developers, system integrators, and OEMs to streamline quantum hardware development and scaling.

Company size: 51-200
Company stage: Early VC
Total funding: $55M
Headquarters: San Diego, CA
Founded: 2025

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