Weekend Retired Mechanical Engineer Jobs in Reston, VA

About FusionICS, LLC

Fusion is a ServiceDisabled VeteranOwned Small Business (SDVOB) specializing in missioncritical engineering, secure infrastructure, and advanced technical solutions for federal and defense clients. We bring precision, integrity, and deep expertise to some of the nations most complex and sensitive programs.

Our team of highly skilled engineers and technical professionals is dedicated to advancing the future of secure facilities and infrastructure. When you join Fusion, you become part of a collaborative, missionfocused organization that values technical excellence and a steadfast commitment to national security.

Position Summary:

Fusion seeks a detail-oriented Mechanical Engineer to support secure facility design and construction within the National Capital Region. The engineer will provide mechanical systems design, technical oversight, and construction phase support for classified and federal infrastructure projects.

This position requires demonstrated experience in HVAC, plumbing, controls, and mechanical code compliance, with a strong emphasis on secure/mission-critical environments.

Clearance Requirement

Active Secret security clearance required; Top Secret clearance preferred. Candidates must be able to obtain and maintain any additional customer-required clearances or access authorizations.

Key Responsibilities:

• Develop mechanical system designs, including HVAC, hydronic piping, ductwork, and plumbing, for secure federal facilities.
• Ensure systems comply with UFC, ASHRAE, IPC, DoD, and local building codes.
• Prepare or review detailed construction drawings and specifications.
• Perform load calculations, system sizing, and energy efficiency evaluations.
• Provide engineering review of contractor submittals, RFIs, and shop drawings.
• Conduct field inspections, oversee system installation, and support commissioning activities.
• Coordinate across disciplines (electrical, architectural, structural, civil) to support integrated designs.
• Participate in facility readiness reviews, design reviews, and construction phase meetings.
• Ensure secure handling of project documentation and data per CUI/ICD-705 requirements.
  

Qualifications & Requirements:

Education & Experience:

• Bachelors degree in Mechanical Engineering from an ABET-accredited program.
• Minimum 5 years of mechanical engineering experience in facility or infrastructure projects.
  
• Experience with DoD construction projects, military facilities, or government contracting preferred.

Certifications & Technical Skills:

• Expertise in mechanical codes, standards, and practices (ASHRAE, UFC, DoD, IPC).
• Strong proficiency with AutoCAD, Revit, and load calculation software (e.g., Trane Trace, HAP).
• Familiarity with SCIF and SAPF mechanical requirements.
• Excellent communication skills and ability to work onsite in active construction environments.
  
• Excellent communication and coordination skills.
• Ability to work safely on active construction sites and wear required PPE.
  
• PE (Professional Engineer) license or active EIT on track for licensure.

Preferred Qualifications:

• Experience with chilled water, hot water, steam, or secure HVAC systems.
• Background in energy modeling and sustainable system design.
• Prior experience with commissioning, TAB, and performance verification in federal environments.
• Experience supporting DoD/NIC classified facilities and ICD/ICScompliance.
  

Work Conditions & Physical Requirements:

• Ability towork in high-security environmentsrequiringstrict access controls and security protocols
• Mixed office and active construction-site environment
• Work in indoor and outdoor environments, including nearhigh-voltage switchgear and substations
• Requireslifting/carrying up to 50 lbs, climbing ladders, and working in confined spaces
• Occasionaltravel to other sites or campusesas needed
• Position is fully onsite and may require night and/or weekend work depending on project scheduling and site demands.

Why Work for Fusion?

At Fusion, we believe exceptional work begins with exceptional people. Our teams bring together technical excellence, integrity, and a shared commitment to delivering missioncritical solutions that directly support national security. Here, your expertise has real impact. Youll collaborate with experienced professionals, contribute to meaningful programs, and be part of a supportive smallbusiness culture invested in your growth and success.

What We Offer

• Medical insurance with a generous employer HSA contribution
• 401(k) with company match and immediate vesting
• 15 days of vacation
• 5 days of sick leave
• 11 paid federal holidays
• A missionfocused, supportive smallbusiness culture where your work makes a real impact

FusionICS, LLC is an Equal Opportunity Employer. We consider all qualified applicants without regard to race, color, religion, sex, national origin, age, disability, veteran status, or any other protected characteristic.