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Merrick & Company’s High Performance Facilities (HPF) team is seeking an experienced Senior Mechanical Facilities Engineer to support the design and delivery of HVAC and plumbing systems for a wide range of national defense projects in our San Antonio, TX office.

Relocation will be considered.

From multi-building campuses to secure facilities across the globe, the HPF team delivers practical, high-performance solutions that meet Government requirements for resilience, readiness, and reliability. Our work directly supports the operation and efficiency of installations critical to the protection and defense of the United States.

The Senior Mechanical Facilities Engineer will support the design and delivery of HVAC and plumbing/piping systems for a wide range of mission critical to mission support projects. This role requires independent execution, direct coordination with clients and project teams, and technical leadership within assigned scope.

The Senior Mechanical Facilities Engineer will serve as a senior member of a multidisciplinary team, providing technical guidance and mentoring junior staff to ensure coordinated, high-quality, and constructible deliverables.

Project work will encompass:

• Develop and coordinate HVAC and plumbing system design, including engineering calculations, system layout, equipment selection, HVAC controls, and development of coordinated construction documents.
• Support development and technical oversight of Division 22 and 23 specifications, ensuring alignment with UFC, UFGS, and applicable codes and standards including ICC, IMC, IPC, ASHRAE, and NFPA.
• Perform QA/QC reviews of mechanical designs, ensuring technical accuracy, code compliance, and alignment with project requirements.
• Support proposal development, including defining mechanical scope and developing fee and design schedule estimates.
• Interface directly with Federal, State, and Local government clients, including participation in design reviews, value engineering studies, charrettes, and technical discussions.

• Bachelor of Science in Mechanical Engineering from an ABET-accredited program.
• Minimum twelve (12) years of experience in HVAC and plumbing system design.
• Professional Engineer (PE) license required.
• Client projects for this position require U.S. Citizenship.

Technical Experience

• Demonstrated experience designing HVAC and plumbing systems for commercial, institutional, or federal facilities.
• Experience in performing engineering calculations and equipment selection for air systems, hydronic systems, and building water systems.
• Experience developing coordinated construction documents (plans, details, schedules).
• Experience developing and coordinating Division 22 and 23 specifications.

Codes, Standards, and Tools

• Working knowledge of applicable codes and standards including IMC, IPC, IBC, ASHRAE, SMACNA, and NFPA.
• Familiarity with DoD design criteria (UFC, UFGS).
• Experience with HVAC load calculation software (e.g., Trane TRACE or equivalent).
• Proficient in Revit for MEP coordination; familiarity with AutoCAD.

• Experience supporting federal or DoD projects (e.g., USACE, AFCEC, NAVFAC).
• Experience supporting construction administration (submittals, RFIs, site visits).
• Familiarity with Life Cycle Cost Analysis (LCCA) and energy modeling (ASHRAE 90.1).
• LEED, Green Globes, or other sustainability accreditation.
• Current passport.

• Employee Ownership – All eligible U.S. employees participate in our Employee Stock Ownership Plan (ESOP), sharing in the company’s success.
• Comprehensive Compensation & Benefits – Merrick & Company offers a competitive compensation and benefits package including health insurance, dental and vision coverage, and paid time off (PTO).
• Robust Referral Program – Earn incentives for referring top talent to join our team.
• Performance Reviews – Annual reviews to recognize contributions and support career growth.
• Professional Development – Access to ongoing training and development opportunities to build your skills and advance your career.
• Employee Recognition – Formal programs to celebrate achievements and outstanding performance.
• Peer Mentor Program – Get support and guidance through structured mentorship opportunities.
• And More – Additional programs and benefits designed to support your success and well-being.

• Apply online only. No e-mail, hard copy or third-party resumes accepted.
• At Merrick, every resume is carefully reviewed by our team of experienced human recruiters—never by AI. We are committed to a fully human-centered hiring process, ensuring each candidate receives thoughtful, personalized attention at every stage.
• Merrick is an Equal Opportunity Employer, including disability/vets.
• Employment with Merrick is contingent upon completion of a pre-employment background check, MVR check, and drug screen.

#LI-Hybrid

• Bachelor of Science in Mechanical Engineering from an ABET-accredited program.
• Minimum twelve (12) years of experience in HVAC and plumbing system design.
• Professional Engineer (PE) license required.
• Client projects for this position require U.S. Citizenship.

Technical Experience

• Demonstrated experience designing HVAC and plumbing systems for commercial, institutional, or federal facilities.
• Experience in performing engineering calculations and equipment selection for air systems, hydronic systems, and building water systems.
• Experience developing coordinated construction documents (plans, details, schedules).
• Experience developing and coordinating Division 22 and 23 specifications.

Codes, Standards, and Tools

• Working knowledge of applicable codes and standards including IMC, IPC, IBC, ASHRAE, SMACNA, and NFPA.
• Familiarity with DoD design criteria (UFC, UFGS).
• Experience with HVAC load calculation software (e.g., Trane TRACE or equivalent).
• Proficient in Revit for MEP coordination; familiarity with AutoCAD.