Senior Mechanical Engineer, PE III — Energy & Infrastructure

ENFRA LLC; Creve Coeur (MO); On-site; USD 134,000 - 202,000; Full time

Job summary

ENFRA LLC seeks a Mechanical Professional Engineer III to lead the design, coordination, and delivery of complex mechanical systems for energy and infrastructure projects on hospital and college campuses.

You will oversee multidisciplinary design efforts, ensure code-compliant, constructible HVAC, hydronic, and thermal plant systems, and mentor junior engineers while maintaining performance and energy efficiency objectives.

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.

Responsibilities

• Signing and sealing engineering documents and overseeing technical quality.
• Leading the design and execution of complex mechanical systems and large-scale projects.
• Developing detailed system configurations and control schemes with emphasis on long-term energy savings.
• Establishing engineering approaches, design standards, and best practices.
• Providing technical oversight and review of work performed by junior staff.
• Managing discipline scope, schedules, and budgets on projects.
• Coordinating with clients, stakeholders, and external partners.
• Mentoring and developing junior engineers and designers.

Skills

Leadership

Project management

Mechanical design

Mentoring

Client management

Design coordination

Education

Bachelor's degree in mechanical engineering

Master's degree (preferred)

Tools

3D laser scanning

Job description

ENFRA LLC seeks a Mechanical Professional Engineer III to lead the design, coordination, and delivery of complex mechanical systems for energy and infrastructure projects on hospital and college campuses.

You will oversee multidisciplinary design efforts, ensure code-compliant, constructible HVAC, hydronic, and thermal plant systems, and mentor junior engineers while maintaining performance and energy efficiency objectives.