Mechanical Engineering Senior

Job Description GIG - General / Generation, Industrial & Govt
We will never ask for sensitive information, such as bank account details, SSN, etc., If you receive any communication asking for such information, it is not from Mesa. We’ve got the power to energize your career and spark YOUR work/life balance through professional development and exceptional benefits. 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. 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.
Technical Expertise: HVAC, Utility Systems & Piping 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, switchgear 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 B31.3 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, MicroStation, and SolidWorks 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

Personally perform HVAC load calculations, equipment selection, and ductwork design for assigned projects, from concept through issued-for-construction
Support the design of utility systems as needed, including compressed air, cooling water, cooling towers, potable water, hydraulic, and lubricating systems
Support piping design tasks as needed, including layout, routing, and basic sizing, working alongside engineers working on Piping & Pressure Systems
Perform process calculations, such as flow rate and pressure drop, directly within the Mechanical Engineering group; Mesa does not have a separate Process Engineering function, so this work sits with Mechanical
Perform walkdowns and collect detailed field data across HVAC, utility, and piping equipment to support scoping
Move fluidly between HVAC, utility, and piping assignments based on department and project needs
Own deliverables directly across HVAC, utility, and piping-support work, in addition to reviewing and advising on the work of others
Work alongside junior and mid-career engineers, offering input, coaching, and mentorship across whichever scope you're supporting
Coordinate directly with other disciplines, including civil/structural, electrical, and controls, on integration-heavy scopes
Support proposal development and client-facing technical discussions across HVAC, utility, and piping scopes
Bachelor's degree in Mechanical Engineering and PE License (required)

• 10+ years of experience with genuine breadth across HVAC, utility systems, and piping design, ideally in power generation, industrial, or facilities environments
• Demonstrated, current hands-on design and calculation experience across multiple mechanical disciplines, not solely project oversight
• Comfortable moving between different types of mechanical scopes as project needs shift, without needing to specialize in just one
• A track record of coaching and developing engineering staff
• A collaborative, team-first mindset and a genuine willingness to roll up your sleeves and help wherever needed

• Group Medical/Dental Insurance
• Life Insurance (Company Paid)
• Disability Insurance (Company Paid)
• 401(K) Retirement Savings plan
• Tuition Reimbursement
• Fitness Center Reimbursement
• Annual Performance Bonus