Mechanical Engineer - Temporary Climate Systems Design

Polygon US; Beaverton (OR); On-site; USD 90,000 - 95,000; Full time

Job summary

Polygon US in Beaverton, Oregon, is seeking a Mechanical Engineer to support the Engineering and Estimating team across the full project lifecycle. You will perform load calculations, system design, bidding support, client presentations, field deployment, and post‑project documentation, with travel for site visits and meetings.

This engineering‑track role requires strong thermodynamics and HVAC fundamentals, CAD proficiency, and excellent written and verbal communication.

Qualifications

• Bachelor’s degree in Mechanical Engineering or a related field.
• Solid understanding of thermodynamics, heat transfer, and HVAC fundamentals.
• Comfortable with psychrometric calculations.
• Strong written and verbal communication skills.
• MS Office proficiency, with Excel as a strength.
• Demonstrated CAD experience.
• Willingness to travel on short notice, including nights/weekends for emergencies.

Responsibilities

• Perform load calculations for cooling, heating, moisture, and ventilation across diverse facilities.
• Perform psychrometric chart analyses and study weather to inform design decisions.
• Design temporary systems from Polygon’s equipment fleet.
• Develop project layouts, equipment schedules, and sequences of operation.
• Support estimating: take‑offs, equipment selection, scope development, and pricing inputs.
• Prepare and present engineered solutions to clients and internal teams.
• Translate technical decisions into clear client communications.
• Provide engineering support for field deployment, startup, and commissioning.

Skills

Thermodynamics

Heat transfer

HVAC fundamentals

Psychrometric calculations

Excel

CAD

Effective communication

Willingness to travel

Education

Bachelor’s degree in Mechanical Engineering

Tools

CAD software

Job description

Polygon US in Beaverton, Oregon, is seeking a Mechanical Engineer to support the Engineering and Estimating team across the full project lifecycle. You will perform load calculations, system design, bidding support, client presentations, field deployment, and post‑project documentation, with travel for site visits and meetings.

This engineering‑track role requires strong thermodynamics and HVAC fundamentals, CAD proficiency, and excellent written and verbal communication.