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Mazzetti, INC.

Mechanical Designer/Engineer

United States

$76,000 - $139,000 per year

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Job details

Pay: $76,000 - $139,000 per year
Experience: 4–8 years of mechanical engineering or mechanical design experience within the AEC consulting industry.
Posting language: English
Posted: Nov 4, 2026

Original job description

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Job Type

Full-time

Description

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.

Requirements

Education & Experience

Bachelor’s degree in Mechanical Engineering or a related engineering discipline, or equivalent mechanical design experience.
4–8 years of mechanical engineering or mechanical design experience within the AEC consulting industry.
Demonstrated experience designing HVAC and mechanical building systems, including load calculations, equipment selections, and duct and piping design.
Experience coordinating with multidisciplinary engineering teams.
Experience preparing construction documents and supporting projects through construction.
Plumbing or fire protection design experience is beneficial but not required

Technical Expertise

Strong knowledge of HVAC and mechanical building systems.
Thorough understanding of applicable building codes and industry standards.
Proficiency with Revit, AutoCAD, Bluebeam, and mechanical load calculation software.
Experience preparing engineering calculations, equipment selections, specifications, and construction documentation.
Familiarity with sustainable, resilient, and high-performance building design principles.
Strong written, verbal, and presentation skills.

Licenses & Certifications

Engineer-in-Training (EIT) certification or Professional Engineer (PE) license preferred.

What We Offer At Mazzetti, we believe in supporting our employees with competitive compensation and a dynamic benefits package.

Compensation: The typical salary range for a Mechanical Designer / Engineer in the St. Louis, MO area is $76,000 - $139,000. We are committed to equitable pay and will evaluate final compensation based on relevant experience and skills in alignment with internal equity and market data.

Comprehensive Benefits:

Medical, dental, vision, flexible spending accounts (FSA), health savings account (HSA), company paid short-term disability (STD), long-term disability (LTD), and life insurance.
Participation in our company-funded Employee Stock Ownership Plan (ESOP).
Performance based bonuses.
401(k) with employer matching.

Work-Life Balance:

Generous PTO and 9 paid holidays.
Flexible work options: fully remote, hybrid, or in-office options, with flexible hours (depending on the role)
Wellness program with live and on-demand fitness classes, mental health resources, wellness challenges, and incentives for healthy habits

Family Support: Paid parental leave and EAP Services.

Professional Development:

Funding for memberships, licenses, certifications, and tuition reimbursement.
Mentorship opportunities to help you grow in your career.

Home Office Support:

Reimbursement for cellphone and internet costs for qualifying employees.
Home office package and additional reimbursement opportunities for work-related expenses.

Community Engagement:

Paid volunteer time-off annually.
Employee engagement programs and Employee Resource Groups (ERGs).
Gain hands-on experience furthering Mazzetti’s mission of making environments better through the Sextant Foundation. Learn more here.

Mazzetti is an Equal Opportunity Employer. We embrace diversity and value individuals from all backgrounds and do not discriminate based on race, color, religion, gender identity or expression, sexual orientation, national origin, genetics, disability status, age, or any other characteristic protected by federal, state or local law. We are committed to and promote an inclusive environment where everyone is respected and empowered to contribute. If you require accommodations at any stage of the hiring process, please let us know. Join us in shaping a brighter future through engineering and innovation.

Salary Description

$76,000 - $139,000 per year

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More about this job

Skills

Documentation
Building systems monitoring technology
Project management
Plumbing
HVAC
Mechanical systems
Regulatory compliance
Building codes
Collaborate with engineers
Quality control
Process improvement
Mechanical engineering
Autodesk Revit
Autodesk AutoCAD
Bluebeam
Design buildings
Presentation skills
EIT
P.Eng.

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