Mechanical Engineer 4

Posted Yesterday
Be an Early Applicant
San Diego, CA, USA
In-Office
175K-225K Annually
Senior level
Hardware • Semiconductor • Quantum Computing • Manufacturing
Delivering quantum light engines at scale
The Role
Designs, analyzes, documents, tests, and supports precision opto-mechanical assemblies, laser systems, and photonic products. Performs structural, thermal, vibration, fluid, and heat-transfer analysis; designs optical flexures and metrology setups; conducts experiments; supports fabrication, procurement, integration, and testing. The role requires extensive mechanical engineering expertise, CAD and quantitative analysis, technical documentation, independent execution, collaboration, and mentoring junior engineers in a startup environment.
Summary Generated by Built In

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.

Skills Required

  • Bachelor's degree in mechanical engineering, physics, or a related field
  • Minimum 5 years of relevant experience
  • U.S. person status as defined by 8 U.S.C. § 1324b(a)(3), due to access to export-controlled information
  • Extensive mechanical engineering expertise and understanding of conventional mechanical engineering principles
  • 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
  • Knowledge of photonic assembly techniques, including die bonding, vacuum reflow soldering, wire bonding, and adhesives
  • Knowledge of structural analysis, including static analysis, modal analysis, random vibration, and shock response
  • Knowledge of fluid mechanics and heat transfer, including conduction, convection, and radiation
  • Experience with mechanical CAD software, preferably SolidWorks
  • Experience with quantitative analysis and programming tools such as Python
  • Experience with instrumentation, measurement techniques, component fabrication or procurement, systems integration, and testing
  • Experience with data collection, analysis using ANSYS Workbench, and technical documentation
  • Startup or technology company experience

Monarch Quantum, Inc. Compensation & Benefits Highlights

The following summarizes recurring compensation and benefits themes identified from responses generated by popular LLMs to common candidate questions about Monarch Quantum, Inc. and has not been reviewed or approved by Monarch Quantum, Inc..

  • Leave & Time Off Breadth — Time-off provisions include 20 PTO days and 13 paid holidays, indicating broad leave availability. A 9/80 schedule is also advertised, adding flexibility with every other Friday off.
  • Retirement Support — Retirement benefits feature a Fidelity 401(k) with a 4% employer match and immediate vesting. This combination signals solid support for long-term savings.
  • Fair & Transparent Compensation — Compensation is presented as competitive with larger San Diego tech employers, and job postings publish substantial salary ranges by role and level. This visibility indicates an intention to align pay with market benchmarks.

Monarch Quantum, Inc. Insights

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The Company
HQ: San Diego, CA
160 Employees
Year Founded: 2025

What We Do

Monarch Quantum is a U.S.-based quantum photonics company that designs and manufactures integrated photonics systems, known as Quantum Light Engines™, for quantum computing, sensing, and communications.

Why Work With Us

We’re looking for curious, driven individuals inspired by the intersection of physics, engineering, and imagination. Here, you’ll collaborate with world-class experts to scale transformative quantum solutions, see measurable impact from your work, and grow through mentorship and cross-disciplinary collaboration while benefiting from a flexible,

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