Mechanical Engineer III

Back Mechanical Engineer III
Engineering Pheonix , Arizona Full-Time Sep 28, 2026

Join a dynamic engineering team where you'll lead the design and delivery of mechanical building systems across a diverse portfolio of projects, including commercial, life sciences, government, mission critical, and industrial facilities. In this role, you'll take ownership of project execution from concept through construction, collaborating with multidisciplinary teams to develop innovative, high-quality engineering solutions that help clients achieve their operational goals.

TAI brings together engineering, construction, systems integration, on-site services, and technical services — combining proven execution with trusted expertise to support clients across the entire project lifecycle. Team members at TAI are capable, well-rounded, flexible, and optimistic. We have found that the best employees are the ones who recognize the importance of what they do and the ones who let that guide them in the actions they take.

More than any skill, we seek people who make decisions that support the common good. We work for our clients, and we work for one another.

• Individuals in this position are responsible for planning, organizing, and successfully completing multiple engineering tasks with minimal direction and supervision.
• As an Engineer III, you will be expected to successfully lead small and mid-size design projects in entirety with the assistance of a designer.
• This position receives general administrative direction from the Mechanical Division Manager.
• Supporting multiple projects.
• Leading small and mid-size design projects with support from Sr. and Chief Engineers.
• Directing other engineers and designers for preparation of drawings and engineering calculations.
• Collaborating and coordinating with other engineering disciplines and stakeholders.
• Researching applicable codes and industry standards.
• Interpreting codes and collaborating with other design professionals as needed.
• Preparing engineering analysis and reports, including conditions assessment.
• Preparing engineering calculations and reviewing calculations prepared by others.
• Developing preliminary and detailed engineering designs.
• Creating engineering specifications and controls sequences with support from Sr. and Chief Engineers.
• Preparing COMcheck calculations.
• Performing design quality control, monitoring progress, and notifying managers of scope changes.

• Bachelor’s degree from an accredited university in Mechanical Engineering.
• US Citizenship is required.
• Professional Engineering Licensure or the ability to obtain a PE.
• LEED accreditation is preferred.
• Minimum 5 years of mechanical engineering design experience on relevant projects. Applicable design experience includes creating construction documents for HVAC air side, HVAC water side, plumbing, and fire protection systems, with significant expertise in at least one of these areas.
• Minimum 5 years of experience preparing heating and cooling load calculations and performing ventilation rate procedure (VRP).
• Minimum 5 years of experience performing ductwork and/or piping pressure drop calculations.
• Minimum 5 years of experience preparing equipment selections for HVAC and/or plumbing equipment.
• Minimum 3 years of experience collaborating with vendors for equipment selections.
• Ability to direct engineers and/or designers for creation of drawings in Revit and CAD.
• Ability to perform field work that will include walking, kneeling, sitting, standing, climbing stairs and/or ladders.
• Willingness to travel to client sites.
• Willingness to work in the office at least two days per week.
• Willingness to work in a team environment.
• Ability to…