Thermal Systems Engineer

GTI Fabrication • Phoenix, AZ

20h

About The Position

GTI is a contract manufacturing partner supporting customers in renewable energy, power generation, infrastructure, and industrial systems. We fabricate custom designed, purpose-built enclosures and skids for our customers and perform mechanical and electrical integration in-house, delivering a true turn-key product to our customers. Our scope spans Engineering, prototype builds, through full production, requiring teams that can move fast, adapt, and execute with precision. GTI Values: Safey I Quality I Customer Obsession I Speed I Agility. GTI Energy is seeking a Senior Mechanical Engineer to lead mechanical and thermal system design for enclosed industrial products including BESS platforms, modular data centers, power skids, and integrated energy infrastructure. This role is responsible for designing cooling systems, airflow management strategies, enclosure integration, and mechanical assemblies that perform reliably under real-world operating constraints. This is not a traditional HVAC or commercial building engineering role. GTI is specifically seeking candidates with experience designing cooling systems for enclosed equipment and industrial systems where space limitations, airflow management, manufacturability, vibration, acoustics, serviceability, and environmental conditions must all be considered simultaneously. The ideal Senior Mechanical Engineer has experience supporting products such as battery systems, power electronics, generator enclosures, modular data centers, industrial skids, switchgear systems, or other enclosed industrial equipment requiring engineered thermal management solutions.

Requirements

• Bachelor’s degree in Mechanical Engineering or related engineering discipline
• 6–12+ years of experience in mechanical engineering, thermal systems design, or product development within industrial or engineered product environments
• Experience designing cooling systems for enclosed equipment — not commercial building HVAC systems
• Strong experience with thermal management for battery systems, power electronics, industrial skids, generator enclosures, modular data centers, switchgear, or similar products
• Experience sizing cooling systems based on actual equipment heat loads and operational requirements
• Strong understanding of airflow management inside enclosed systems
• Proficiency with SolidWorks or similar 3D CAD platforms
• Strong knowledge of manufacturability, fabrication methods, and industrial product integration

Nice To Haves

• Experience supporting BESS, modular data centers, power systems, or industrial energy infrastructure
• Experience with CFD analysis and thermal modeling tools
• Background in sheet metal, weldments, enclosure design, or industrial packaging
• Experience in contract manufacturing or engineered-to-order product environments
• Familiarity with UL requirements, environmental testing, or industrial compliance standards
• Experience operating in fast-paced, high-growth engineering organizations

Responsibilities

• Design and integrate cooling systems for enclosed industrial equipment including BESS systems, modular data centers, power distribution equipment, and power generation platforms
• Size cooling systems based on actual equipment heat loads, thermal rejection requirements, and operating conditions
• Develop airflow strategies inside enclosed systems including ducting, circulation paths, pressure balancing intake/exhaust placement, and thermal zoning
• Design systems for worst-case ambient conditions, elevated operating loads, and real-world environmental constraints rather than nominal conditions only
• Select and integrate off-the-shelf cooling equipment including HVAC units, heat exchangers, fans, chillers, and thermal management components
• Own mechanical design from concept through production release including enclosure layouts, mounting systems, access requirements, structural interfaces, and equipment integration
• Develop 3D CAD models, assemblies, manufacturing drawings, and BOMs using SolidWorks and related engineering tools
• Design for manufacturability, assembly efficiency, serviceability, and long-term reliability
• Support integration of pumps, piping, cable routing, thermal barriers, and mechanical support systems
• Coordinate packaging constraints involving electrical systems, structural members, airflow, and maintenance access
• Perform thermal analysis, airflow modeling, and engineering calculations supporting cooling system performance
• Support CFD analysis and interpretation where applicable
• Validate mechanical and thermal performance through testing, prototype evaluation, and field feedback
• Participate in heat runs, system testing, troubleshooting, and performance optimization activities
• Ensure designs meet customer, regulatory, and operational requirements
• Partner with Electrical Engineering, Structural Engineering, Manufacturing Engineering, NPI, Quality, and Operations teams throughout product development lifecycle
• Collaborate closely with manufacturing teams to ensure designs align with fabrication, welding, assembly, and integration capabilities
• Support prototype builds, pilot programs, and production launch activities
• Work directly with Supply Chain and vendors on component selection, manufacturability, and technical problem solving
• Drive DFM initiatives focused on reducing complexity, improving repeatability, and supporting scalable production
• Design around manufacturing constraints including weldments, sheet metal fabrication, assembly sequencing, and production tolerances
• Resolve production issues quickly and support continuous product improvement efforts
• Standardize mechanical design approaches, cooling architectures, and reusable engineering solutions where possible
• Support Root Cause Analysis for field issues, thermal failures, or performance deviations
• Contribute to engineering standards, design guides, and best practices across product lines
• Mentor junior engineers and provide technical leadership on mechanical and thermal design challenges
• Drive continuous improvement in performance, cost, manufacturability, and reliability

Benefits

• Medical, dental, and vision insurance
• 401(k) with company match (where applicable)
• Paid Time Off (PTO) and paid holidays
• Sick time in accordance with state and local requirements
• Company-paid life insurance and disability coverage
• Career advancement opportunities within a rapidly growing organization
• Exposure to advanced manufacturing, modular infrastructure, and large-scale industrial projects
• Collaborative, fast-paced environment with strong operational and engineering leadership
• Employee-focused culture centered on safety, quality, accountability, and continuous improvement

What This Job Offers

• Job Type: Full-time
• Career Level: Senior