Mechanical Designer/Engineer

Who We Are

Mazzetti is a global engineering design and consulting firm with a rich history of delivering forward-thinking solutions primarily for Healthcare and Science and Technology facilities and infrastructure. As an employee-owned benefit corporation, we are committed to bending the climate curve™. Though our story began with a small team of MEP engineers, 60 years later, we’ve grown to 200+ people in 12 locations across the U.S., India, and Africa. We are proud to partner with clients, addressing a spectrum of needs, mindful of their environmental footprint, resiliency, and economic and functional interests.

Our Vision: Creating healthier, enduring environments

Our Mission: Bending the climate curve™

Our Core Values: Earn Trust, Team First, Inspire

We proudly hold the JUST Label, an affirmation of our values-driven culture and commitment to environmental and social impact.

Job Summary

Mazzetti is seeking a Mechanical Designer/Engineer based in the greater St. Louis area to join our engineering practice and contribute fully to the analysis, design, and documentation of mechanical/HVAC systems for healthcare and other mission critical projects. Engineers in this role take ownership of system design on small to mid-size projects, working collaboratively with senior engineers, architects, and multidisciplinary teams, with the opportunity to grow into more complex projects and client and project management responsibilities over time.

You will be part of Mazzetti’s Mechanical, Electrical, and Plumbing (MEP) Consulting Engineering Practice- a multidisciplinary team dedicated to designing high-performance, resilient, and sustainable solutions for the built environment. With a strong emphasis on healthcare and infrastructure projects, our practice blends technical rigor with a collaborative, client-centered approach to deliver exceptional, future-ready outcomes.

Core Responsibilities

Mechanical Design & Engineering

• Design HVAC and mechanical building systems for commercial, institutional, healthcare, and other complex facilities.
• Perform engineering analyses, calculations, equipment selections, and system studies.
• Prepare construction documents, including plans, specifications, schedules, and technical documentation.
• Coordinate mechanical systems with architectural, structural, electrical, plumbing, and specialty disciplines.
• Review engineering drawings and specifications for quality, constructability, code compliance, and technical accuracy.
• Apply applicable building codes, industry standards, and Mazzetti quality expectations throughout project delivery.

Project Delivery

• Collaborate with project managers, architects, engineers, contractors, vendors, and clients throughout all phases of project delivery.
• Participate in project planning, multidisciplinary coordination meetings, and design reviews.
• Support construction administration by responding to RFIs, reviewing submittals, participating in site visits, and resolving technical issues during construction.
• Contribute to successful project delivery by supporting schedule, quality, and client expectations.

Team Collaboration

• Work closely with multidisciplinary engineering teams across Mazzetti offices.
• Share technical knowledge and collaborate with engineers and designers throughout the organization.
• Participate in quality control reviews and continuous improvement initiatives.
• Mentor junior staff as experience allows.

Work Location: This is a hybrid position based in the St. Louis, Missouri area. We ask that you work from our St. Louis office approximately two days per week, with flexibility in scheduling, along with client and project site visits as needed.

Travel Requirements: Approximately 10–15% travel, primarily within the St. Louis, Missouri area based on project assignments.