Senior Mechanical Engineer

gpac LLC.; St. Louis (MO); On-site; USD 120,000 - 160,000; Full time

Job summary

gpac LLC is seeking an experienced Senior Mechanical Engineer to lead design and planning across multiple large, complex projects in the St. Louis area, ensuring compliance with specifications, codes, and standards.

The role covers system design for mechanical and plumbing/piping systems, equipment sizing, and development of operation sequences, with oversight of load calculations and document integrity from preconstruction through post-construction closeout. Occasional travel is expected.

Qualifications

• 10+ years of design engineering experience.
• PE license required.
• Bachelor's degree in Mechanical, Electrical, or Construction Engineering.
• Occasional travel.

Responsibilities

• Lead design and planning for large, complex projects.
• Lead internal commissioning and coordinate with Operations early in design.
• Design mechanical and plumbing/piping systems; select equipment and write specifications.
• Perform load calculations and code compliance checks.
• Maintain project files and release packages for coordination.
• Conduct field walk-throughs and manage as-built changes.

Skills

Design engineering

Systems design

Load calculations

Code compliance

Education

Bachelors in Mechanical, Electrical, or Construction Eng

Job description

Job Summary

We are seeking an experienced Senior Mechanical Engineer who can perform engineering related duties for the design and planning phases of multiple and/or large, complex design and construction projects, ensuring compliance with specifications, codes, and standards.

Responsibilities

• Preconstruction Duties: Leads peer review of design progress and coordinates with Operations Division on design and cost control related matters. Assists Operations in developing scope of work documents and schematic budgets. Collaborate with team members to identify and incorporate project goals. Creates engineering only estimates and monitors progress throughout design phases.
• Commissioning: Leads internal commissioning process on projects. Works with Operations to incorporate needs of commissioning early in design/preconstruction phase of work.
• System Design: Performs and leads system design for mechanical and plumbing/piping systems; selects and sizes equipment, ductwork, and piping; writes specifications; and develops sequences of operation for defined solutions. Performs and reviews load calculations and compliance checks as necessary to ensure technical accuracy and code compliance. Provides technical oversight and guidance to ensure quality, consistency, and constructability of design deliverables.
• Engineering Documentation: Maintains project files and produces design calculation reports and documents release packages for coordination.
• System Layout and Modeling: Creates design sketches and engages in/or supervises engineering modeling.
• Post-Construction Duties: Conducts field walk-throughs and creates punch list on designed work. Participates in client follow-up and closeout activities. Modifies design documents to reflect as-built conditions.

Requirements

• 10+ years of design engineering experience
• Bachelor's Degree in Mechanical, Electrical, or Construction Engineering or related field
• Occasional Travel
• PE License Required
• Industrial/Manufacturing design experience a plus

All qualified applicants will receive consideration without regard to race, age, color, sex (including pregnancy), religion, national origin, disability, sexual orientation, gender identity, marital status, military status, genetic information, or any other status protected by applicable laws or regulations.