Mechanical Field Engineer

We are seeking a Mechanical Field Engineer to support a large-scale industrial construction project in the United States. This role focuses on the on-site execution of mechanical systems, including piping, HVAC, plumbing, and utilities, for the WAL6 project in Walla Walla, Washington.

The successful candidate will serve as the Owner’s representative on site, working closely with contractors and subcontractors to ensure efficient project execution. Responsibilities include reviewing Issued for Construction (IFC) drawings and technical documentation, supporting RFIs and field issue resolution, monitoring progress, conducting inspections, and assisting with testing, commissioning, and system turnover.

This is a hands-on field position suited to an engineer with a strong understanding of construction practices, the ability to coordinate across multiple disciplines, and a proactive approach to resolving on-site mechanical challenges.

Key Responsibilities

• Represent the Owner in overseeing mechanical works on site, ensuring compliance with approved drawings, project specifications, quality standards, applicable codes, client requirements, and HSE procedures.
• Support on-site execution of mechanical systems, including process and utility piping, HVAC, plumbing, equipment installation, supports, insulation, testing, and turnover activities.
• Coordinate daily activities with contractors, subcontractors, supervisors, construction management, QA/QC, HSE, engineering, and commissioning teams.
• Review and interpret IFC drawings, P&IDs, isometrics, HVAC and plumbing drawings, equipment layouts, and technical specifications.
• Verify that field installations align with design documentation and identify discrepancies between drawings and actual site conditions.
• Assist in resolving RFIs, technical queries, design conflicts, constructability issues, and field changes.
• Identify and escalate technical, quality, safety, or schedule risks to the Mechanical or Construction Manager.
• Monitor construction progress and report delays, deviations, or potential project impacts.
• Participate in coordination meetings, technical reviews, and site walkdowns with multidisciplinary teams.
• Conduct field inspections and quality checks across mechanical installations and system interfaces.
• Support testing, flushing, cleaning, leak testing, pre-commissioning, commissioning, and final system turnover.
• Track and verify closure of punch list items and support project close-out activities.
• Ensure adherence to HSE requirements, including permits to work, hot work, confined space entry, lifting operations, pressure testing safety, and LOTO procedures.
• Maintain clear, professional communication with all stakeholders and ensure timely documentation and issue resolution.

Required Qualifications

• Bachelor’s degree in mechanical or industrial engineering.
• 2–5 years of experience in mechanical field engineering, construction, or industrial project execution.
• Practical experience with piping, HVAC, plumbing, and/or utility systems on large-scale industrial or infrastructure projects.
• Strong ability to read and interpret mechanical drawings, P&IDs, isometrics, and technical documentation.
• Solid understanding of installation practices, construction sequencing, QA/QC processes, and project turnover.
• Familiarity with U.S. construction practices and relevant mechanical, plumbing, HVAC, and piping codes.
• Experience managing RFIs, punch lists, inspections, progress reporting, and contractor coordination.
• Strong technical knowledge of piping systems, supports, valves, pumps, HVAC equipment, ductwork, plumbing systems, and utilities.
• Excellent communication, coordination, and problem-solving skills.

Preferred Qualifications

• Experience working on the client or owner side of construction projects.
• Exposure to international contractors and subcontractors.
• Background in industrial sectors such as manufacturing, energy, food & beverage, pharmaceuticals, or heavy construction.
• Knowledge of relevant U.S. codes and standards (e.g., ASME, SMACNA, IPC/UPC, IMC, NFPA, OSHA).
• Experience with testing, commissioning, and system turnover processes.
• Familiarity with BIM and construction management tools such as Navisworks, AutoCAD, Procore, Aconex, or Bluebeam.
• Proven ability to coordinate mechanical interfaces across multiple disciplines.

Employment Requirements

• Candidates must be legally authorized to work in the United States and be available for full-time, site-based work.

Why Join MacKay?

A people-first culture
At MacKay, we put people first. We are committed to creating an environment where employees can grow, contribute, and do their best work. We support well-being, encourage balance, and create space for people to succeed both professionally and personally.

Meaningful work and real impact
Our teams take on complex infrastructure and environmental challenges that support critical systems and shape the places where people live and work. Every role contributes to delivering that work and making it successful.

Growth and opportunity
We are in an exciting phase of growth, expanding across geographies, services, and markets. That growth creates opportunities for our employees to take on new challenges, build their careers, and contribute in new ways as the company evolves.

A strong and trusted foundation
Built on more than 50 years of experience, MacKay has developed a reputation for quality work, strong relationships, and dependable results. You’ll be part of a team with a solid foundation and a clear direction for the future.

Opportunities to share in success
We provide opportunities for employees to participate in ownership and build long-term financial value as the company grows.

Our Values

At MacKay, our values guide how we work, collaborate, and support one another.

• Honesty. We build trust through transparency, integrity, and accountability.
• Dedication. We are committed to the success of our team members, clients, and communities.
• Relationships. We foster lasting connections that strengthen our work and the teams around us.

Who We Are

MacKay is an infrastructure and environmental services firm built on more than 50 years of experience and a growing collective of expertise.

We are in an exciting phase of growth, expanding our reach, strengthening our capabilities, and bringing together talented teams across the country. That growth is creating new opportunities for our employees to take on meaningful work, collaborate across disciplines, and build long-term careers.

Every role at MacKay contributes to the success of our projects and the clients we serve. Whether your work is technical or operational, you are part of a team that delivers quality, builds relationships, and moves projects forward.

We’re looking for dedicated, talented individuals who deliver excellence, thrive in collaborative environments, and value both meaningful work and work-life balance. If this sounds like you, we’d like to hear from you.

Please note that the salary information shown below is a general guideline only. Salaries are based upon candidate experience and qualifications, as well as various market and business considerations.