Senior Mechanical Engineer

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We’ve got the power to energize your career and spark YOUR work/life balance through professional development and exceptional benefits. Don’t delay, plug in today for an inclusive and meaningful career. Mesa Associates, Inc. is a woman/minority-owned full-service engineering, procurement, and project management firm covering power, defense, aerospace, industrial, commercial, and municipal entities. We specialize in power generation and delivery services. We have been in the top 10 of EC&M's Top 40 Electrical Design Firms since 2012.

With over 1,000 associates, we are big enough to perform, but small enough to care!

Mesa Associates is seeking a Senior Mechanical Engineer to serve as a true generalist across our Mechanical Engineering department, delivering projects for our Generation, Industrial, and Government clients. This is a hands‑on technical role: you will personally design HVAC systems, plant utilities, and piping scopes as project needs shift, without being boxed into a single specialty. You'll serve as a go‑to resource who advises and mentors mid-career and junior staff across whatever scope you're supporting.

We're looking for someone versatile, approachable, and just as comfortable picking up a new type of scope as sticking with a familiar one.

What We're Looking For

• Expert, hands‑on knowledge of industrial HVAC design, including heating, ventilation, air conditioning, exhaust, and specialized environmental control for equipment rooms, control rooms, switch gear rooms, and process spaces
• Demonstrated ability to perform heating and cooling load calculations, size ductwork and equipment, and select chillers, air handling units (AHUs), fans, and dampers
• Strong working knowledge of ASHRAE standards, the International Mechanical Code (IMC), and related codes as applied to industrial and power generation facilities
• Hands‑on knowledge of mechanical design codes including ASME, ANSI, API, and NFPA, with a strong understanding of ASME B31.1/B31.3 piping codes and ASME Boiler & Pressure Vessel Code Section VIII, API 650, and API 620
• Experience performing detailed stress analysis of piping systems, custom piping components, or fabrication assemblies using AutoPIPE and/or CAESAR II
• Proficient with Plant3D, AutoCAD, Micro Station, and Solid Works across HVAC, utility, and piping layouts, routing, and equipment coordination
• Strong knowledge of power generation types, including coal, gas, and hydro, and how HVAC, utility, and piping systems support each
• Working knowledge of utility systems, the supporting infrastructure that keeps plant equipment running (as distinct from HVAC or main process equipment), including:
  • Compressed air systems
    : supply instrument air and service air for pneumatic tools, instrumentation, and control valves
  • Cooling water systems
    : raw and closed‑loop cooling water and cooling towers that remove heat from process equipment, condensers, and bearings
  • Potable water systems
    : provide clean water supply for facility and personnel use
  • Hydraulic systems
    : deliver pressurized fluid power for valve actuators, cranes, and similar equipment
  • Lubricating systems
    : supply oil or lubricant to pumps, turbines, compressors, and other rotating equipment to reduce wear

What You'll Do

• Personally perform HVAC load calculations, equipment selection, and ductwork design for assigned projects, from…