Senior Mechanical Engineer – HVAC & Plumbing Lead

3S MEP; Chicago (IL); On-site; USD 90,000 - 130,000; Full time

Job summary

3S MEP is seeking a Senior Mechanical Engineer with 4+ years of US-based experience in HVAC and plumbing design across commercial, healthcare, residential, hospitality, and restaurant projects. Experience in fire protection is a plus.

You will lead mechanical design development from concept through construction documents, coordinating with multidisciplinary teams to deliver code-compliant, high-quality engineering solutions in Chicago and surrounding areas.

Qualifications

• Minimum 4 years of mechanical engineering experience in building systems.
• Strong experience in HVAC and plumbing design.
• Proficiency in AutoCAD, Revit MEP, and HVAC load calculation tools (Carrier HAP/Trane Trace).
• Ability to manage multiple projects with tight deadlines.
• Strong communication and coordination skills.

Responsibilities

• Lead HVAC and plumbing system design, including load calculations, ductwork, piping, and layout development
• Define project scope, schedules, resources, and deliverables across multiple assignments
• Prepare complete design packages with accuracy and technical quality
• Coordinate with architectural, structural, and other engineering disciplines
• Communicate with clients and vendors regarding design requirements and equipment specifications
• Ensure compliance with applicable codes and standards including Chicago Building Code, IMC, IBC, NFPA, and ASHRAE
• Evaluate design alternatives for e2iciency, cost, and life-cycle performance
• Review shop drawings, respond to RFIs, and support construction-phase coordination
• Develop schematic designs, sequences of operation, and BMS I/O summaries

Skills

HVAC and Plumbing Design

Load Calculations

Project Management

Communication Skills

Coordination with Disciplines

Tools

AutoCAD

Revit MEP

Carrier HAP

Trane Trace

Job description

3S MEP is seeking a Senior Mechanical Engineer with 4+ years of US-based experience in HVAC and plumbing design across commercial, healthcare, residential, hospitality, and restaurant projects. Experience in fire protection is a plus.

You will lead mechanical design development from concept through construction documents, coordinating with multidisciplinary teams to deliver code-compliant, high-quality engineering solutions in Chicago and surrounding areas.