Thermal System Engineer

OptiGrid; Longmont (CO); On-site; USD 125,000 - 140,000; Full time

Benefits offered by this job

Competitive salary

Health insurance

Dental insurance

Vision insurance

PTO

Job summary

A progressive energy technology company in Longmont, Colorado seeks a Thermal System Engineer to design advanced thermal management systems for electric vehicle DC fast charging solutions. The ideal candidate will have over 5 years of experience and a Bachelor's degree in Mechanical Engineering. This role involves direct influence on product performance and reliability in a hands-on environment, requiring exceptional engineering skills and a commitment to collaborative problem-solving. Competitive compensation and benefits are offered.

Qualifications

• 5+ years designing thermal management systems.
• Expertise in battery thermal systems and large-scale cooling.
• Advanced CAD skills and knowledge of ASME Y14.5 standards.

Responsibilities

• Engineer advanced thermal systems for electric vehicle DC fast charging.
• Prepare detailed drawings and schematics, and fabricate prototypes.
• Develop test plans and conduct lab experiments for testing.

Skills

Bachelor's degree in Mechanical Engineering

5+ years of hands-on experience designing thermal management systems

Expertise in battery thermal systems

Advanced 3D CAD skills

Exceptional written and verbal communication skills

Education

Bachelor's degree in Mechanical Engineering or equivalent

Tools

PTC Creo Parametric CAD software

Arena

Windchill PLM

Job description

This range is provided by OptiGrid. Your actual pay will be based on your skills and experience — talk with your recruiter to learn more.

Base pay range

$125,000.00/yr - $140,000.00/yr

OptiGrid is an energy technology company accelerating fleet electrification with battery-integrated DC fast charging solutions. Our modular solution combines charging, energy storage, and grid management to eliminate costly infrastructure upgrades and cut deployment timelines from years to weeks. We're growing rapidly and need people who move quickly, think creatively, and find solutions to tough problems. If you want to make a real impact helping fleets go electric, we'd love to hear from you.

Position Overview:

As a Thermal System Engineer at OptiGrid, you’ll be the architect behind the thermal systems that manage our next-generation battery and power electronics platforms. Your expertise will directly influence product performance, reliability, and customer satisfaction—opening new markets and driving our technology forward. This is a hands-on role driving designs from concept and early prototype testing to production with our manufacturing partners.

Key Responsibilities:

• Design & Innovate: Engineer advanced thermal systems for electric vehicle DC fast charging, pushing the boundaries of efficiency and reliability.
• Create & Build: Prepare detailed drawings and schematics, fabricate and assemble prototypes, and bring concepts to life.
• Test & Validate: Develop test plans, conduct lab experiments, and translate results into actionable insights and robust test reports.
• Collaborate & Lead: Work cross-functionally to launch new products, support compliance testing, and solve manufacturing and quality challenges.
• Drive Excellence: Diagnose and resolve issues in production, ensuring every part and assembly meets the highest standards.

Qualifications:

• Bachelor’s degree in Mechanical Engineering or equivalent
• 5+ years of hands‑on experience designing thermal management systems
• Expertise in battery thermal systems and large‑scale cooling (forced air, refrigerant)
• Experience implementing mechanical and thermal solutions for power electronicsTrack record of taking designs into volume production (sheet metal, extrusion, injection molding)
• Advanced 3D CAD skills and knowledge of ASME Y14.5 standards
• Exceptional written and verbal communication skills

Preferred Skills:

• Master’s degree in Mechanical Engineering or equivalent
• 10+ years in electronics packaging
• Proven success with Computational Fluid Dynamics (CFD) modeling and validation
• Background in EV supply equipment product design and lithium‑ion battery systems
• Mastery of PTC Creo Parametric CAD software
• Proficiency with Arena and Windchill PLM

Why Join OpriGrid?

Make an Impact: Help accelerate fleet electrification and reduce carbon emissions by enabling faster, more affordable EV charging infrastructure deployment.

Work With Great People: Join a collaborative team that values diverse perspectives. We solve hard problems together and celebrate wins as a team.

Competitive Compensation & Benefits: Competitive salary and comprehensive benefits including health, dental, vision insurance, and PTO.

At OptiGrid, LLC, we offer fair and equal opportunities to all our candidates and team members regardless of race, color, religion, sex, pregnancy, sexual identity, national origin, citizenship, marital status, disability status, parental status, veteran status, or any other characteristics protected by law. OptiGrid, LLC believes in hiring individuals only based on their qualifications and experiences that meet our business requirements to fill the positions.