Mechanical Design Engineer – BTM BESS Enclosures

We are seeking a MDE for our client in Collin County.

Job Type: 6-12 month contract
Experience Level: Mid–Senior (4–8+ years)

About the Role

We’re looking for a Mechanical Design Engineer to take end-to-end ownership of behind-the-meter (BTM) Battery Energy Storage System (BESS) enclosures. In this startup environment, you won’t just execute drawings—you’ll help define product architecture, make real design tradeoffs, and work hands-on with suppliers and manufacturing partners.

You’ll design indoor, outdoor, and portable enclosures that are safe, cost-effective, manufacturable, and compliant with industry codes, often with evolving requirements and ambitious timelines. If you enjoy seeing your designs quickly built, deployed, and used in the real world, this role is for you.

What You’ll Do

Own the Enclosure System (End to End)

• Architect and design BTM BESS enclosures from concept through production and field deployment
• Design systems that integrate:
  • Battery modules and racks
  • Power electronics and control compartments
  • HVAC, airflow, ducting, and service access
• Drive enclosure decisions across concept designs, prototypes, pilot builds, and production releases
• Create scalable enclosure platforms that can be reused across multiple products

Hands-On Mechanical Design

• Develop detailed 3D CAD models and production drawings for:
  • Sheet metal parts, welded frames, and structural assemblies
  • Doors, gasketing, latching, cable routing, and mounting features
• Rapidly iterate designs based on testing, supplier input, and field feedback
• Perform tolerance stack-ups, packaging trade studies, and basic structural checks

Design for Manufacturing, Cost, and Deployment

• Apply DFM/DFA principles from the start
• Simplify assemblies, reduce part count, and optimize build flow
• Work directly with:
  • Sheet metal and fabrication vendors
  • Contract manufacturers and coating providers
• Balance performance, cost, and lead time in every design decision
• Support prototype builds, factory trials, and early customer deployments

Safety, Compliance, and Certification

• Design enclosures to support compliance with:
  • UL 9540 / UL 9540A
  • UL 1973
  • NFPA 855
• Incorporate features for:
  • Fire containment, gas venting, and pressure relief
  • Safe service access, grounding, and maintenance clearances
• Support certification testing, test article builds, and design updates based on results

Cross-Functional Collaboration

• Work closely with electrical, systems, thermal, firmware, manufacturing, and deployment teams
• Translate ambiguous or evolving system requirements into robust mechanical designs
• Support customers, installers, and field service with design improvements
• Help establish mechanical standards, best practices, and documentation as the company scales

What We’re Looking For

Required Qualifications

• BS in Mechanical Engineering or a related field
• 4–8+ years of mechanical design experience (energy, industrial, EV, power electronics, or heavy equipment preferred)
• Strong experience with:
  • Sheet metal and enclosure design
  • 3D CAD tools such as SolidWorks, Creo, NX, or equivalent
  • Production drawings, BOMs, and GD&T
• Comfortable working in fast-paced environments with changing priorities and incomplete requirements

Preferred Qualifications

• Experience designing enclosures for BESS, solar + storage, EV charging, UPS, or industrial power systems
• Familiarity with:
  • NEMA / IP ratings and outdoor environmental requirements
  • Thermal system integration (HVAC units, fans, heat exchangers)
  • Corrosion protection and coatings (powder coat, e-coat, stainless steel, aluminum)
  • UL or IEC certification processes

If interested email us an updated resume to Jobs.AllenTX@ExpressPros.Com w/ Job # D189 in the subject line.