Logo for William Charles Construction Company, LLC,  a MasTec Company

Principal Mechanical Engineer

Role overview

Qualifications

  • Bachelor’s degree in Mechanical Engineering (Master’s degree preferred)
  • 10+ years of mechanical engineering experience in power delivery, substations, or energy infrastructure
  • Professional Engineer (P.E.) license preferred
  • Proficiency with design and analysis software such as AutoCAD, Revit, CFD, Pipe-Flo, Thermoflow, and FEA tools (e.g., ANSYS and/or SolidWorks)

Responsibilities

  • Serve as the technical authority and discipline lead for all mechanical engineering aspects of power delivery projects, including design reviews for HVAC, oil containment, cooling systems, piping, conduits, and equipment enclosures
  • Lead development and review of calculations, specifications, design drawings, and construction documentation; provide mechanical design guidance for transformer installations, GIS, and high-voltage equipment layouts
  • Collaborate with civil, electrical, and structural teams; conduct site visits and field assessments; manage scopes, schedules, budgets, and deliverables
  • Mentor engineers and CAD technicians; ensure QA/QC, safety standards, and adherence to codes; support client-facing presentations and business development

About the company

William Charles Construction Company, LLC,  a MasTec Company logo

William Charles Construction Company, LLC, a MasTec Company

Construction

William Charles Construction, a MasTec company, is a full-service heavy civil contractor, supporting the public and private sectors in building highly dependable civil infrastructure. Based in Rockford, Illinois, William Charles Construction manages and self-performs a full range of heavy civil construction. We are hiring. Join our team today!

Company details

IndustryConstruction
Company size51 - 200

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Job description

Overview:

We are seeking a highly experienced and technically skilled Principal Mechanical Engineer to lead mechanical engineering efforts within our Major Projects Power Delivery division. This role is responsible for providing strategic technical leadership and oversight for mechanical systems associated with substations, transmission lines, and grid infrastructure. 

As a key member of our engineering leadership team, the Principal Mechanical Engineer will guide multidisciplinary project teams, ensure design excellence, and support the development of innovative, reliable, and cost-effective solutions that advance grid modernization and energy transition initiatives. 

Responsibilities:
  • Serve as the technical authority and discipline lead for all mechanical engineering aspects of power delivery projects. 
  • Oversee and review the design of HVAC systems, oil containment, cooling systems, piping, conduit supports, equipment enclosures, and other mechanical components for substations and related facilities. 
  • Lead the development and review of calculations, specifications, design drawings, and construction documentation. 
  • Provide mechanical design guidance for transformer installations, gas-insulated substations (GIS), and high-voltage equipment layouts. 
  • Support thermal and ventilation studies, ensuring that substation environments maintain safe and efficient operating conditions. 
  • Collaborate with civil, electrical, and structural teams to deliver fully integrated and constructible design solutions. 
  • Conduct site visits and field assessments to collect data, verify conditions, and support construction and commissioning activities. 
  • Manage project scopes, schedules, budgets, and deliverables to ensure high-quality and timely completion. 
  • Lead the development of standards, procedures, and best practices for mechanical design in power delivery applications. 
  • Mentor and provide technical guidance to mechanical engineers, designers, and CAD technicians. 
  • Serve as a client-facing technical expert, presenting engineering solutions, addressing complex challenges, and supporting business development activities. 
  • Ensure adherence to QA/QC procedures, safety standards, and applicable codes (ASME, NFPA, API, IEEE, and NESC). 
Qualifications:
  • Bachelor’s degree in Mechanical Engineering (Master’s degree preferred). 
  • 10+ years of mechanical engineering experience in power delivery, substations, or energy infrastructure. 
  • Professional Engineer (P.E.) license required preferred
  • Strong understanding of fluid mechanics, heat transfer, and mechanical systems for substation or industrial facilities. 
  • Proficiency with design and analysis software such as AutoCAD, Revit, CFD, Pipe-Flo, or Thermoflow. 
  • FEA software proficiencyExpertise in using FEA software (e.g., ANSYS and/or SolidWorks ), modeling CAD software. 
  • In-depth knowledge of industry standards (ASME, NFPA, API, IEEE, NESC, and IEC). 
  • Proven experience in project management, team leadership, and client relations. 
  • Excellent analytical, organizational, and communication skills. 
  • Ability to manage multiple complex projects and guide cross-disciplinary teams to successful outcomes. 

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MR

Marcus Rivera

Chief Revenue Officer

m.rivera@company.com
linkedin.com/in/marcusrivera
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