Mechanical Engineer

Polygon US Corp; Dallas (TX); On-site; USD 70,000 - 100,000; Full time

Job summary

Polygon US Corp seeks a Mechanical Engineer to support the Engineering and Estimating team across the full project lifecycle, including load calculations, system design, bidding support, client presentations, and field deployment. The role is office-based with travel for site visits and emergency response.

You will translate technical decisions for clients and internal teams, develop SOPs, and create technical documentation.

Qualifications

• Bachelor’s degree in Mechanical Engineering or related field.
• Solid understanding of thermodynamics, heat transfer, and HVAC fundamentals.
• Comfortable with psychrometric calculations.
• Strong written and verbal communication skills.
• MS Office proficiency across the board, with Excel as a strength.
• Demonstrated CAD experience.
• Willingness to travel on short notice, including nights/weekends.
• Valid US driver’s license; able to work on construction/industrial sites.

Responsibilities

• Perform load calculations — cooling, heating, moisture, and ventilation — for temporary climate solutions across construction sites and facilities.
• Perform psychrometric analyses to inform design decisions.
• Design temporary systems from Polygon’s equipment fleet.
• Develop project layouts, equipment schedules, and sequences of operation for clients.
• Support the estimating process: 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-friendly language.
• Serve as engineering resource for field technician team during deployment, startup, commissioning, and troubleshooting.
• Travel to project sites on short notice for emergencies, kickoffs, or complex deployments.
• Translate field observations into design improvements.
• Develop and maintain SOPs for specific systems and clients.
• Create technical documentation and closeout packages.
• Build out engineering templates and reference materials.

Skills

Load calculations

Psychrometric analysis

System design

Project layouts

Estimating support

Client presentations

CAD

Excel

Travel readiness

Education

Bachelor's degree in Mechanical Engineering

Tools

CAD software

MS Office

Job description

Must be located in: Orlando, FL; Dallas, TX; or Portland, OR.

Under the direction of the Engineering & Estimating Manager -National, the Mechanical Engineer is responsible for supporting the Engineering and Estimating team across the full project lifecycle, including load calculations, system design, bidding support, client presentations, field deployment, and post-project documentation. This is an engineering-track role with exposure to a wide variety of industries and applications. The day-to-day work is office-based, with travel for site visits, client meetings, and emergency response.

Essential Job Functions

• Perform load calculations — cooling, heating, moisture, and ventilation — for temporary climate solutions across construction sites, industrial and manufacturing facilities, food production plants, automotive and battery plants, aerospace facilities, data centers, commercial buildings, and labs


• 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 tailored to each client’s environment and process needs


• Support the estimating process: take-offs, equipment selection, scope development, and pricing inputs for bids and proposals


• Prepare and present engineered solutions to clients, general contractors, and internal sales teams


• Translate technical decisions into clear, client-friendly language


• Serve as the engineering resource for the field technician team during equipment deployment, startup, commissioning, and troubleshooting


• Travel to project sites on short notice when needed — for emergency response, project kickoffs, complex deployments, or field issues that require engineering oversight


• Translate field observations into improvements to design and project execution


• Develop and maintain Standard Operating Procedures (SOPs) for specific systems, applications, and key clients


• Create technical documentation, including system narratives, commissioning checklists, monitoring plans, and project closeout packages


• Build out engineering templates and reference materials to improve consistency and efficiency across the team

Job 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, with the ability to explain technical concepts to engineers, salespeople, technicians, and clients


• MS Office proficiency across the board, with Excel as a particular strength


• Demonstrated CAD experience


• Willingness to travel on short notice, including occasional nights and weekends for emergency response


• Valid US driver’s license and the ability to work on construction and industrial job sites

Preferred Training Requirements and Competencies

• EIT certification


• 1–3 years of experience in HVAC, mechanical contracting, temporary climate solutions, dehumidification, or a related field


• Exposure to construction sites, manufacturing facilities, food production, automotive or battery plants, aerospace, data centers, or controlled environments such as labs, cleanrooms, and pharmaceutical facilities


• Familiarity with building codes, OSHA site safety, and standard PPE requirements


• Experience supporting estimating, sales, or field service teams

Demonstration of the Polygon Values

• Integrity


• Empathy

As set forth in Polygon US’s Equal Employment Opportunity policy,we do not discriminate on the basis of any protected group status under any applicable law.