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Senior Mechanical Engineer

Job in St. Louis, Saint Louis, St. Louis city, Missouri, 63105, USA
Listing for: Gillespie & Powers, Inc.
Full Time position Listed on 2026-11-06
Job specializations:
  • Engineering
    Mechanical Engineer, Manufacturing Engineer, Engineering Design & Technologists, Systems Engineer
Salary/Wage Range or Industry Benchmark: 90000 - 130000 USD Yearly USD 90000.00 130000.00 YEAR

Job Description & How to Apply Below

Location: St. Louis

At Gillespie & Powers, we aren't just a company - we're a tight-knit, family-owned business united by a common drive for success and growth. With a legacy of over 85 years in our industry, we've maintained our status as a trusted leader while continually expanding our presence and influence. Our unwavering dedication to quality, innovation, and customer satisfaction has always been the bedrock of our achievements.

Currently, we are in search of an exceptional and driven Senior Mechanical Engineer to join our dynamic team. As a Senior Mechanical Engineer at Gillespie & Powers, you'll play a pivotal role in advancing our company's mission and leading our team to greater achievements. If you're on the lookout for a thrilling and challenging opportunity where your skills and experience can have a profound impact, then this role is the ideal fit for you.

Job Summary:

As a Senior Mechanical Engineer, you design and deliver mechanical systems for GPx's heavy industrial thermal process equipment, mainly aluminium melting and holding furnaces. You are a technical specialist who solves practical problems with no standard solution, produces checked calculations and drawings, and works alongside the Applications, Electrical and Controls, Proposals and Build teams. You work within the GPx Engineering Management Model, keep your own items on the engineering board current, and support Developing Lead Engineers and junior engineers.

Depending on your development, you may be assigned scoped work packages or a Developing Lead Engineer role under the Engineering Development Framework. Leading a whole project is the Project Lead Engineer role, which is a separate step.

Key Responsibilities:
  • Conceptualize and create solutions for complex mechanical design issues on furnaces and associated plant.
  • Produce design calculations covering combustion, hydraulic, pneumatic, structural, exhaust and stack, and thermal heat balance, each with a stated design basis (standard or code, assumptions and source data).
  • Start from the GPx controlled masters and standards, re-validate them against the current contract, and raise change requests to the master owner when you find an error or an improvement.
  • Create 3D models of assemblies, sub-assemblies, parts and detail drawings, and detail drawings in accordance with ASME Y14.5 and Y14.100 drafting standards.
  • Analyze designs and systems for compliance with applicable standards and customer specifications (for example NFPA 86, ASME, structural codes or customer specific), checking performance guarantees can be achieved.
  • Select proper materials, finishes and hardness for design applications.
  • Create and maintain the Bill of Materials for your scope, accurate and aligned to drawings and models, and prepare requisitions and technical input for quotes.
  • Check team members' models and drawings for design intent and accuracy, and arrange independent checks of safety-critical calculations.
  • Take part in design reviews, internal and with clients, and follow the design process flow.
  • Keep your assigned items on the engineering board current: owner, required by date, status and decisions, with a note of what the supporting report contains and where the design rationale sits.
  • Update weekly EVA hours for your work, and raise risks, changes and blockers early with options and a recommendation.
  • Update and manage redline activities for your drawings, and confirm your discipline content is checked and technically ready before release.
  • Provide site and commissioning technical support, and feed lessons learned back to the project and to the controlled masters.
  • Mentor and develop junior engineers and Developing Lead Engineers in technical method, and teach and follow department standards.
  • Respond to technical…

Position Requirements

10+ Years work experience
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