Senior Electro-Mechanical Engineer

Monarch Quantum, Inc.; San Diego (CA); On-site; USD 125,000 - 175,000; Full time

Benefits offered by this job

Medical, Dental, and Vision insurance

401(k) with 4% employer matching

20 paid time off days per year

Job summary

Monarch Quantum, Inc. in San Diego seeks a Senior Electro-Mechanical Engineer to design robust mechanical and electrical interfaces for photonic systems.

You will own 3D routing, BOM management, and EMI shielding while collaborating with EE/ME teams to ensure reliable enclosure interfaces and cooling. The role demands a hands-on startup mindset, 5+ years in mechanical or electro-mechanical roles, and a strong background in SolidWorks, FEA, and Python/MATLAB tooling to drive precise, high-quality

Qualifications

• Bachelor's degree in mechanical engineering, physics, or related field; Master's preferred.
• Minimum of 5 years of relevant experience, ideally in startup or technology company.
• Experience with mechanical CAD and quantitative analysis/FEA.
• Ability to collaborate cross-functionally and mentor junior engineers.

Responsibilities

• Specify and source high-density electrical connectors, RF coaxial connectors, optical fiber connectors (e.g., MPO, LC).
• Define cable bundle characteristics (wire gauge, shielding, bend radii, jacket materials).
• Manage Electro-Mechanical BOM and ensure full documentation and sourcing.
• Design 3D routing for power/signal cabling and fiber patch cords in standard 19-inch racks or enclosures.
• Implement EMI shielding and segregation to protect photonics signals.
• Collaborate with EE/ME to co-design PCBs to enclosure interfaces and ensure proper pinouts and cooling.
• Design rugged sheet-metal rack enclosures and mounting brackets; support thermally stable photonics components.
• Perform tolerance stack-up analyses for high-density backplanes; use SolidWorks and analytic tools.

Skills

SolidWorks

Python

MATLAB

3D CAD

FEA

Education

Bachelor's degree in mechanical engineering or physics

Master's degree preferred

Tools

ANSYS Workbench

Job description

Join our fast-paced and passionate team as a Senior Electro-Mechanical Engineer

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:

• Work independently and in a team while 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 through mentorship, curiosity, communication, exposure and initiative.

• 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. Master’s preferred.

• Minimum of 5 years of relevant experience, ideally within a startup or technology company.

Skills & Responsibilities

Interconnect & Component Specification

• Specify and source high‑density electrical connectors, RF coaxial connectors, optical fiber connectors (e.g., MPO, LC), and hybrid electro‑optical backplanes.

• Define cable bundle characteristics, including wire gauge (AWG), shielding (EMI/RFI protection), bend radii (especially critical for fiber optics), and jacket materials appropriate for thermal and regulatory compliance.

• Manage and maintain the Electro‑Mechanical Bill of Materials (BOM), ensuring all connectors, strain reliefs, and cable assemblies are fully documented and sourced.

Electro‑Mechanical Integration & Cable Routing

• Design complex 3D routing pathways for both electrical power/signal cabling and sensitive fiber optic patch cords within standard 19‑inch racks or custom enclosures.

• Implement effective strain relief, cable management arms, and routing accessories to ensure reliability during system servicing and slide‑out rack operations.

• Incorporate strict Electro‑Magnetic Interference (EMI) shielding and segregation practices to prevent power cables from disrupting sensitive photonics signals.

Cross‑Functional EE/ME Collaboration

• Act as the primary engineering bridge to the Electrical Engineering team, co‑designing physical PCBs to enclosure interfaces, ensuring pinouts match physical connector layouts, and ensuring adequate high‑stability cooling.

• Translate electrical schematics and block diagrams into physical wire lists, cable drawings, and schematic‑to‑3D routing layouts.

• Collaborate on power distribution unit (PDU) placement, busbar routing, and grounding/bonding strategies for the entire rack.

Structural & Thermal Design for Photonics

• Design rugged sheet‑metal rack enclosures, sub‑chassis, and mounting brackets capable of supporting heavy components while minimizing structural vibration to internal photonics modules.

• Collaborate on thermal management strategies (forced air, liquid cooling, or thermoelectric coolers) to ensure the precise temperature stability required by photonics components.

• Conduct or supervise tolerance stack‑up analyses for high‑density blind‑mate connections on backplanes.

• Demonstrated successful execution of engineering tasks including use of mechanical CAD (SolidWorks preferred) and quantitative analysis/programming tools (Python, Matlab), and finite element analysis tools (ANSYS Workbench or similar).

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.

The expected annual salary range for this position is $125,000-$175,000.

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.