Top 107 Mechanical designer Jobs in Fairfax, Va

Senior Residential Mechanical Designer
PEG, LLC —Fairfax, VA
- $68,000 a year
- Full-time
- Hybrid work
- Bachelor of Science
- Office
- Residential
- Paid holidays
- Disability insurance
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4d
Mechanical Designer I (MEP)
Interface Engineering, Inc. —Washington, DC
- $65,933 - $86,720 a year
- Hybrid work
- Office
- Children
- Budgeting
- Commuter assistance
- Paid holidays
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1d
Senior Mechanical Engineer
Axon —Sterling, VA
- $90,000 - $144,000 a year
- Email
- Hybrid work
- Office
- Master's degree
- Analysis skills
- Paid parental leave
- Health insurance
Quick Apply
Airframe Design Engineer
Electra Aero —Manassas, VA
- $92,000 - $112,000 a year
- Full-time
- Mid-level
- Office
- Master's degree
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Mechanical Engineer/Designer
Salas O'Brien, Inc. —Tysons, VA
- Hybrid work
- 5 years
- Senior level
- Mechanical knowledge
- Paid holidays
- Health insurance
Graduate Designer 2026-2027
Henderson Engineers —Chantilly, VA
- $43.50 - $45.75 an hour
- Full-time
- English
- Research
- Office
- Profit sharing
- Paid training
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Junior Electrical Engineer
CACI —Dulles, VA
- $72,700 - $149,200 a year
- Urgently hiring
- Military
- Bachelor of Science
- Continuous improvement
- Health insurance
Entry - Mid Level Fire Designer/Engineer
Henderson Engineers —Chantilly, VA
- $72,160 - $153,120 a year
- Full-time
- Schematics
- Research
- Mid-level
- Profit sharing
- Paid training
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Mechanical Engineer, Data Centers - Remote (U.S.)
AECOM —Arlington, VA
- $150,000 - $195,000 a year
- Full-time
- Remote
- 6 years
- Mid-level
- Master's degree
- AD&D insurance
- Employee stock purchase plan
Mechanical Engineer I
Affiliated Engineers, Inc. —Washington, DC
- Online Application
- Writing skills
- System design
- Office
- Health insurance
- Dental insurance
Printed Circuit Board Designer
Space Dynamics Laboratory —Chantilly, VA
- $60,000 - $110,000 a year
- Full-time
- Mid-level
- Experience equivalent to degree accepted
- Associate's degree
6d
Structural CAD/BIM Designer
Hazen and Sawyer —Fairfax, VA
- Hybrid work
- Mid-level
- Office
- Associate's degree
- Paid holidays
- Disability insurance
Quick Apply
Entry Level Electrical Designer
Salas O'Brien, Inc. —Tysons, VA
- Hybrid work
- Office
- Analysis skills
- Electrical Engineering
- Paid holidays
- Health insurance
Graphic Designer III - Part Time
Chickasaw Nation Industries —Rockville, MD
- Part-time
- Ability to walk for extended periods
- Mid-level
- Office
- AD&D insurance
- Disability insurance
12d
CAD/3D Electrical Designer IV
X energy LLC —Rockville, MD
- $115,000 - $140,000 a year
- Full-time
- Hybrid work
- 3 years
- High school diploma or GED
- Travel
- Disability insurance
- Health insurance
14d
CIVIL DESIGNER / TECHNICIAN
AHU Technologies Inc —Washington, DC
- $94,000 - $97,000 a year
- Full-time
- Civil engineering
- 5 years
- Research
- Health insurance
- Dental insurance
Quick Apply
Plumbing Engineer/Designer
MEP Designs —Manassas, VA
- Mid-level
- 3 years
- Quality control
VDC BIM Designer, DC Design Engineering
Amazon Data Services, Inc. —Herndon, VA
- $96,600 - $160,000 a year
- Full-time
- Senior level
- Electrical Engineering
- 2 years
- AD&D insurance
- Health insurance
Field Engineer (Designer)
Rosendin —Sterling, VA
- Full-time
- Microsoft Outlook
- Construction site
- System design
- AD&D insurance
- Paid holidays
Quick Apply
12d
CAD Designer
Structural Technologies / VSL —Washington, DC
- $28 an hour
- Full-time
- Mid-level
- Office
- Mentoring
- Paid holidays
- Health insurance
Quick Apply

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Senior Residential Mechanical Designer

PEG, LLC -
Fairfax, VA

Quick Apply

Job Details

Full-time
$68,000 a year
4 days ago

Benefits

Paid holidays
Disability insurance
Health insurance
Dental insurance
401(k)
Paid time off
Vision insurance
Professional development assistance
Pet insurance

Qualifications

HVAC system design and layout
CAD software
Residential construction experience
Design engineering
SharePoint
Building code analysis
Design of mechanical systems
Technical Proficiency
Mechanical knowledge
Data analysis software

Full Job Description

WHO ARE WE?

PEG, LLC is in its twenty-eighth year being a diverse energy efficiency, engineering, environmental and management consulting firm operating principally in the Eastern and Central United States.

PEG, LLC is proud to partner with many of the nation’s leading homebuilders in delivering construction compliance services. As a leader in Home Energy Ratings, a winner of multiple Energy Star Awards, and a standout in the construction industry, PEG has provided Home Energy Ratings for over 250,000 homes. Our mission is to deliver innovative, data-driven solutions that support high-performance buildings, sustainable development, and client success across residential and commercial sectors. We strive to continually improve building energy efficiency and therefore, the quality of homes and life in the communities that we service.

Please visit our website at www.pegenv.com to learn more about PEG!

WHO ARE YOU?

Senior Residential Mechanical Designers at PEG play a critical role in driving the quality, efficiency, and technical excellence of residential HVAC design projects. This position serves as a senior technical contributor responsible for influencing project outcomes, improving design processes, supporting code compliance, and advancing PEG’s commitment to high-performance and green building practices. Through advanced expertise in residential mechanical design, this role directly impacts project accuracy, client satisfaction, operational efficiency, and overall team development.

This senior-level position is intended for experienced professionals who demonstrate strong technical leadership, independent decision-making, and the ability to mentor and train team members. PEG specializes in sustainable and energy-efficient residential design, and this role is instrumental in ensuring projects consistently meet the highest standards of performance, compliance, and innovation. We are seeking a self-motivated, detail-oriented, and solution-driven professional who thrives in a collaborative and fast-paced environment.

THE ROLE

Job Location:

This position is based in our main office in Fairfax, VA with the option of a hybrid remote/office work schedule.

Essential Functions:

Lead the preparation, review, and validation of HVAC load calculations, duct sizing, ventilation strategies, and equipment sizing in accordance with ACCA Standards and applicable energy codes
Serve as a senior technical resource for the analysis and design teams
Perform advanced QA/QC reviews of residential mechanical designs and energy modeling deliverables
Identify design, compliance, or workflow issues and communicate recommendations and resolution options to management
Manage complex project scopes by organizing deliverables, milestones, and project priorities
Establish and maintain project timelines while proactively adjusting schedules based on project demands and changing conditions
Develop technical solutions and process workarounds to maintain project progress and quality standards
Coordinate and validate design relationships with internal departments, clients, builders, architects, and other project stakeholders
Interpret client requirements, jurisdictional constraints, and project-specific design considerations
Utilize and adapt to industry software platforms including Manual J Software, AutoCAD, Wrightsoft/Wrightdraw, RESCheck, REM/Rate, and other emerging technologies
Maintain and manage project documentation, calculations, and reporting through Excel, SharePoint, and internal systems
Interface with Operations, Owners, Builders, and Subcontractors to resolve technical issues and communicate project impacts
Maintain advanced knowledge of current IECC requirements, state energy codes, and residential mechanical design standards
Support development and implementation of internal best practices, templates, and process improvements
Train and mentor junior and mid-level team members on technical procedures, software applications, code compliance, and company standards
Assist with onboarding and technical development initiatives for new staff
Participate in continuing education, certifications, and professional development related to residential HVAC design and green building practices.

Education/Experience:

B.S. Degree in Mechanical Engineering or related field is required
EIT is strongly encouraged. A salary incentive will be offered to those who obtain it.
Minimum 3+ years of relevant experience in Residential Mechanical (HVAC) Design required;
Advanced proficiency in AutoCAD experience required
Advanced proficiency in HVAC load calculation experience required
Advanced proficiency using WrightSoft or similar residential HVAC design software required
Advanced understanding of ACCA Manual J, Manual D, and Manual S methodologies
Strong working knowledge of IECC, ENERGY STAR®, and state residential energy code requirements
Experience working with green building programs and high-performance residential construction preferred

Additional Requirements:

Advanced proficiency in Excel and SharePoint
Strong attention to detail and accuracy
Deadline-oriented with the ability to manage multiple projects simultaneously
Efficient time management and organizational skills
Effective interpersonal and collaboration skills
Excellent verbal and written communication skills
Ability to read, write, and comprehend technical instructions and documentation
Strong analytical and problem-solving abilities
Ability to work independently with minimal oversight while supporting team development

Rewards and Benefits

PEG LLC offers a comprehensive, total rewards package that includes competitive compensation and a flexible benefits package that reflects our commitment to creating a diverse and supportive workplace.

Benefits include: • 20 Annual Paid Days Off (12 Days of PTO, Birthday PTO, & 7 Company Paid Holidays) • Company Sponsored Medical Insurance that includes a contribution of up to 50% off the monthly premium • Dental & Vision Insurance • 401(k) Retirement Plan with up to a 4% company match vested immediately • Basic Life & Supplemental Life • Short-Term & Long-Term Disability • Accident & Pet Insurance • Corporate Sponsored Events • Paid Professional Development & Salary Incentives through Learning/Certification Opportunities •

PEG LLC is an Equal Employment Opportunity Employer.

PEG, LLC uses E-Verify to confirm the identity and employment eligibility of all new hires.

Quick Apply

Refine Your Search

mechanical designer jobs in fairfax, va

Senior Residential Mechanical Designer

Mechanical Designer I (MEP)

Senior Mechanical Engineer

Airframe Design Engineer

Mechanical Engineer/Designer

Graduate Designer 2026-2027

Junior Electrical Engineer

Entry - Mid Level Fire Designer/Engineer

Mechanical Engineer, Data Centers - Remote (U.S.)

Mechanical Engineer I

Printed Circuit Board Designer

Structural CAD/BIM Designer

Entry Level Electrical Designer

Graphic Designer III - Part Time

CAD/3D Electrical Designer IV

CIVIL DESIGNER / TECHNICIAN

Plumbing Engineer/Designer

VDC BIM Designer, DC Design Engineering

Field Engineer (Designer)

CAD Designer

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