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About Us

At ENFRA, we don't just design-we deliver outcomes that transform how energy infrastructure is financed, built, and sustained.

As the leader in Energy‑as‑a‑Service (EaaS), we integrate engineering, design, construction, financing, and long‑term operations into a single, accountable team-removing traditional barriers between design and execution. This means our engineers don't work in silos or simply hand off drawings; they help shape full‑lifecycle solutions that reduce costs, improve performance, and create measurable, lasting value for our clients.

Our approach goes beyond the traditional models. We combine real‑time collaboration with constructors, operators, and energy specialists to design systems that are not only technically sound-but constructible, operable, and optimized for lifecycle performance. Every project is grounded in accountability, data, and a commitment to delivering guaranteed outcomes-not just design intent.

Through our EaaS model, we empower clients to modernize infrastructure without upfront capital, while achieving guaranteed savings, improved resiliency, and long‑term sustainability. Our teams play a direct role in accelerating the energy transition-delivering solutions that decarbonize facilities, enhance operations, and future‑proof critical infrastructure.

At ENFRA, you'll join a multidisciplinary team that spans the full project lifecycle-from concept through optimization-giving you the opportunity to see your work realized, measured, and continuously improved. We value practical innovation, cross‑disciplinary thinking, and engineers who want to make a real‑world impact beyond the drawing set.

If you're looking to move beyond traditional design and be part of a model that is reshaping the industry-ENFRA is where engineering meets ownership, accountability, and impact

Overview

The Mechanical Professional Engineer III (PE III) serves as a senior technical leader responsible for the design, coordination, and delivery of complex mechanical systems for energy and infrastructure projects for hospital and college campuses. This role leads multidisciplinary design efforts, ensuring code-compliant, constructible solutions for HVAC, hydronic, and thermal plant systems. The PE III manages project execution for assigned scopes, mentors junior engineers, and resolves complex technical and field challenges. Responsibilities include overseeing design quality, supporting permitting and procurement, and ensuring systems meet performance, reliability, and energy efficiency objectives aligned with ENFRA's design-build delivery model.

Responsibilities

+ Responsible for signing and sealing engineering documents and overseeing technical quality.

+ Leads the design and execution of complex mechanical systems and large-scale projects.

+ Develops detailed system configurations and control schemes with emphasis on long-term energy savings.

+ Establishes engineering approaches, design standards, and best practices.

+ Provides technical oversight and review of work performed by junior staff.

+ Manages discipline scope, schedules, and budgets on projects.

+ Supervises the planning for field investigations and site visits. Reviews plans for 3D laser scanning effort.

+ Leads coordination with clients, stakeholders, and external partners.

+ Performs work independently with broad authority.

+ Resolves highly complex technical and project challenges.

+ Actively mentors and develops junior engineers and designers.

+ Supports existing client relationships through technical input, proposals, and client engagement.

Qualifications

Required Education, Experience, and Qualifications

+ Bachelor's degree in architectural engineering, mechanical engineering, or related field

+ 10+ years of design experience

+ Professional Engineer (PE) License

+ Expert knowledge of mechanical system design and applications

+ Strong leadership, project management, and decision-making capabilities

+ Demonstrated ability to lead multidisciplinary teams

+ Advanced communication and client management skills

Preferred Education, Experience, and Qualifications

+ Master's degree in Engineering

+ Experience managing large or program-level projects

+ Experience in energy-as-a-service infrastructure delivery models

Travel Requirements

+ 10-25% of time will be spent traveling to job sites

Physical/Work Environment Requirements

+ Prolonged periods of office work sitting at a desk and working on a computer.

+ Ascending and descending stairs, ladders, ramps, and possibly scaffolding.

+ Occasionally completed field survey in loud, peak/low temperatures, and/or elevated locations.

+ Repeating motions that may include the wrists, hands and/or fingers.

+ Field survey, including traveling to job sites, to document existing conditions and observe construction progress.

+ Light work that includes adjusting and/or moving objects up to 20 pounds.

\#LI-VC1

Pay Range

USD $134,430.00 - USD $201,922.50 /Yr.

ENFRA is proud to be an Equal Opportunity Employer of Minorities, Women, Protected Veterans, and Individuals with Disabilities, and participates in the e-Verify program. All qualified applicants will receive consideration for employment without regard to race, creed, color, religion, sex, age, sexual orientation, gender identity, national origin, veteran status, disability, or any other classification protected by law.

Submit a Referral (https://careers-enfra.icims.com/jobs/11397/mechanical-engineer-pe-iii/job?mode=apply&apply=yes&in\_iframe=1&hashed=-1834357758)

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Job Locations _US-MO-Creve Coeur_

ID _2026-11397_

Category _Engineering/Designers_

Position Type _Full-Time_

Remote _No_

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Mechanical Engineer PE III

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