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GEM Technologies

Federal contractor delivering environmental, nuclear, defense.

HVAC Design Engineer Principal

Full-TimeUpdated on 10/23/2026
No salary listed
Expert
Bachelor's
Greenville, SC, USA
In PersonBased in Greenville, South Carolina; onsite.
Architecture & Civil EngineeringBuilding Services Engineering
No H1B Sponsorship
US Citizenship Required

About the job

Requirements
  • A Bachelor's Degree in Mechanical Engineering and 15 or more years of relevant experience are required.
  • Must be a United States citizen due to the federal nature of the work.
  • Must be able to obtain and maintain a government-issued clearance, if needed.
  • Working knowledge of applicable federal, state, and local codes and standards, including Department of Energy orders.
  • Job-related technical knowledge necessary to complete the job.
  • Advanced knowledge of discipline codes and standards.
  • Ability to perform work in compliance with applicable local, state, and federal codes, statutes, and guidelines.
  • Intermediate computer and software skills, including proficiency in word processing, email, spreadsheet, and electronic presentation programs.
  • Significant experience providing Engineering, Procurement, and Construction (EPC) services on large industrial projects.
  • Proficiency executing large EPC projects using engineering analysis, 3D modeling, and 2D Computer-Aided Drafting and Design (CADD) automation tools in a multidisciplinary environment.
  • Advanced engineering knowledge in the design of heating, ventilation, and air-conditioning (HVAC) systems.
  • Ability to develop HVAC load calculations, airflow diagrams and instrument diagrams, system sequence-of-operation narratives, and HVAC specifications.
  • Ability to size and specify air handling units and other equipment, and size and route main and distribution HVAC ductwork.
  • Ability to develop black utility specifications for chillers, boilers, custom air handling units, air compressors, and cooling towers based on sizing data provided by Process.
Responsibilities
  • Serve as a Supervising Lead, providing guidance and supervision to other engineers and designers.
  • Analyze technical problems of advanced complexity and make independent recommendations for solutions in accordance with project requirements.
  • Develop and review specifications and design criteria.
  • Perform and check engineering analyses and calculations; specify materials, equipment, and systems; and solve technical problems of advanced complexity.
  • Coordinate technical issues with other disciplines, project management, vendors, and clients.
  • Execute work in compliance with the Project Quality Plan and procedures.
  • Execute work in accordance with approved project scope, cost, and schedule baselines.
  • Develop and review estimates, schedules, and progress reports, including effort-hour estimating and staff forecasting.
  • Establish, control, and report material key quantities, and provide analysis and forecasts.
  • Provide technical support for equipment and material procurement and subcontracting, including scopes of work, technical bid evaluations, and vendor-submittal reviews.
  • Provide technical support for construction administration, including responding to construction requests for information and field changes.
Desired Qualifications
  • Professional Engineer license.
  • Experience designing systems, structures, and components for nuclear facilities under ASME NQA-1 requirements.
  • Advanced knowledge of commercial availability and cost of materials.
  • Demonstrated experience managing and leading large projects.
  • Proficiency with project setup, development of control-level schedules, progress reporting, and project closeout.
  • Practical field experience.
  • EPC project experience for the U.S. Department of Energy or another U.S. federal government agency.
  • EPC project experience for nuclear facilities under a nuclear quality assurance program.
  • EPC project experience in manufacturing, pharmaceutical, or biotechnology industries.

About the company

GEM Technologies, Inc. is a federal contractor that provides environmental, nuclear, defense, construction, and facility management services to government and commercial clients. It delivers projects by combining engineering expertise with project management and collaborate-driven execution through regional offices and scalable teams. Its differentiators are a 30-plus-year track record, a broad multi-disciplinary portfolio, strong client relationships, nationwide capabilities, and a commitment to employee and community support. The company aims to help clients achieve their missions by delivering dependable services through collaborative partnerships and a stable, nationwide workforce.

Company Size

51-200

Company Stage

N/A

Total Funding

N/A

Headquarters

Knoxville, Tennessee

Founded

1994

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Simplify's Take

What believers are saying

  • On March 4, 2026, GEM won DOE Atmospheric Radiation Measurement support work.
  • On September 28, 2026, GEM finished ORNL's Advanced Microscopy Laboratory Expansion.
  • GEM's updated 2026 site lists current DOE, FBI, DHS, and State contracts.

What critics are saying

  • Massachusetts and New Hampshire breach notices exposed GEM PII from August 7, 2025.
  • Federal client concentration leaves GEM exposed if DOE, FBI, or DHS recompetes shift.
  • A cyber trust setback after the 2025 breach can kill future classified federal awards.

What makes GEM Technologies unique

  • Founded in 1994, GEM specializes in DOE, NNSA, and ORNL mission-critical facilities.
  • GEM combines environmental, technical, mechanical, and construction services under one federal contractor.
  • GemTech Nuclear Security Solutions gives GEM joint-venture reach across three sites.

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Benefits

  • Health Insurance
  • Dental Insurance
  • Vision Insurance
  • Life Insurance
  • Paid Time Off
  • Paid Holidays
  • 401(k) Retirement Plan
  • 401(k) Company Match

Company News

GEM Technologies, Inc.
Mar 1st, 2022
GEM Technologies, Inc. partners with UT-Battelle LLC

GEM Technologies, Inc. (GEM) is currently working with UT-Battelle at the Oak Ridge National Laboratory (ORNL) to design and construct its new Mission Support Facility (MSF).