Senior Residential Mechanical Designer

PEG, LLC • Fairfax, VA

1d • Hybrid

About The Position

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.

Requirements

• 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
• 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

Nice To Haves

• Experience working with green building programs and high-performance residential construction preferred

Responsibilities

• 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.

Benefits

• 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

What This Job Offers

• Job Type: Full-time
• Career Level: Senior