Mechanical Engineer I/II – Thermal Systems

RiseMe; Hayward (CA); On-site; USD 90,000 - 150,000; Full time

Job summary

Therm-x is seeking a Mechanical Engineer I/II to design components and product variants for brazed and welded heater assemblies. You will turn requirements into 3D models, run calculations, and see parts go from desk to machined, brazed, and tested.

This learn-by-building role grows quickly in a small, customer-focused company. Onsite at Hayward, CA, you’ll develop CAD models (SolidWorks/Inventor/Solid Edge), perform heat-transfer calculations, and support prototypes and production transfers,

Qualifications

• BS in Mechanical Engineering; Level II requires 3+ years of mechanical design.
• Onsite in Hayward, CA with travel to Mexico; passport required.
• Experience with GD&T and drawing packages for release.
• Hands-on fabrication and test setup experience.

Responsibilities

• Develop 3D models and assemblies for heater components.
• Perform power and heat-transfer calculations.
• Review customer requirements and prepare BOMs.
• Support prototype builds and testing.
• Coordinate production transfers with Therm-x Mexico.
• Create design documentation and support design reviews.
• Own engineering changes for parts.
• Use AI-assisted workflows in design processes.

Skills

3D CAD

GD&T

Heat transfer

FEM/FEA

BOMs

Prototype testing

Drawing packages

Supplier collaboration

Education

BS in Mechanical Engineering

Tools

SolidWorks

Inventor

Solid Edge

COMSOL

ANSYS

Job description

Therm-x designs and builds heaters, temperature sensors, and thermal assemblies for semiconductor and high-technology equipment. The Mechanical Engineer I/II designs components, sub-assemblies, and product variants for our brazed and welded heater assemblies, working with a senior engineer who owns the product: you turn requirements into 3D models and drawings, run the calculations, and watch the parts you designed get machined, brazed, and tested a few steps from your desk.

This is a learn-by-building role at a company that has made thermal hardware for over 30 years and is small enough that a good engineer's scope grows fast — a Level II engineer here owns product variants end to end and works directly with customers, suppliers, and our remote engineering team.

Therm-x engineering is investing in AI-assisted workflows for design documentation, analysis setup, and design review; you will use them from your first week.

ESSENTIAL DUTIES AND RESPONSIBILITIES

• Develop 3D models and assemblies (SolidWorks, Inventor, or Solid Edge) for heater and thermal-assembly components and product variants, and release drawing packages with GD&T, including pre-braze and pre-weld details.
• Run the engineering behind the design: power and heat-transfer calculations, tolerance stack-ups, and material selection for service at temperature; support thermal and structural FEA (COMSOL, ANSYS, or similar).
• Review customer requirements, drawings, and specifications; build BOMs and help estimate fabrication and assembly time and cost.
• Support prototype builds and testing with our machinists and technicians: fixtures and test setups, thermal uniformity, cycling, and dielectric tests, data review, and the next design iteration.
• Support production builds and transfers at Therm-x de Mexico, including regular trips to the facility to work directly with the production team.
• Design fixtures, tooling, and test hardware for prototype and production builds.
• Prepare design documentation and presentations for design reviews; own engineering changes on your parts.
• Use our AI-assisted engineering workflows — requirement reviews, drawing and documentation packages, analysis setup, design-review prep — and help make them better.
• Level II: own product variants and sub-assemblies from requirements to production release, coordinate directly with suppliers and our remote engineering team, and help onboard Level I engineers and interns.

Required Skills;

• Solid 3D CAD and drawing fundamentals with GD&T. Level II: complete, checkable drawing packages and tolerance stack-ups.
• Heat transfer, mechanics of materials, and materials fundamentals, and the appetite to learn how brazing, welding, and ceramics behave at temperature.
• Hands-on: comfortable in the shop, can build a test setup, and wants to see the parts you design get made.
• Clear written and spoken communication; organized enough to keep several small projects moving.
• Level II: has taken at least one design from concept through release and worked with suppliers or manufacturing on it.
• Onsite at our Hayward, CA facility — this role is learned on the shop floor.
• Able to travel to our Therm-x de Mexico facility at least once a quarter, typically for several days (valid passport or ability to obtain one).

Preferred Skills;

• Internship, project, or work experience with heaters, thermal systems, or high-temperature hardware.
• Exposure to FEA (COMSOL, ANSYS, or similar) and to reading basic electrical schematics.
• Exposure to brazing, welding, or ceramics; semiconductor equipment or vacuum hardware.
• Curiosity about AI-assisted engineering tools and some hands-on use of them in design or coursework.

Education and/or Experience:

• BS in Mechanical Engineering or closely related engineering discipline; MS a plus.
• Level I: 0–2 years of relevant experience, or strong internship and project work. Level II: 3+ years of mechanical design engineering.

Compensation:USD 90,000 – 150,000 base salary depending on level and experience, plus Therm-x benefits.

Work Location:Onsite, Hayward, CA.

Travel:Yes — international travel to Therm-x de Mexico at least quarterly.

Physical Demands:Regularly required to stand, walk, sit, use hands, reach, stoop, kneel, and crouch; occasionally lift and/or move up to 30 pounds.

Work Environment:Manufacturing facility with machining, brazing, and welding operations; high noise level in shop areas; safety glasses required on the floor.