Senior specialist Building Science

At Mott Mac Donald, we trust our brilliant people to do brilliant things in engineering, management, and development services, supporting multisector project work in over 150 countries. As one of the largest employee-owned companies in the world, we pride ourselves on our ability to deliver exceptional outcomes through our network of 20,000+ talented consultants. With sustainability and innovation at the heart of all our sectors in North America, including, Buildings, Energy, Transportation, and Water.

We believe in empowering our people to excel, learn, and grow, offering diverse opportunities to contribute to career-defining work. Join us and be part of a collaborative environment where your ambitions are united with ours, and you can truly shape your story.

We are seeking a Building Performance Expert with strong expertise in energy modeling and building commissioning to join our sustainability and building services team within Advisory. This role will focus on optimizing building performance, supporting LEED certification, and ensuring compliance with energy codes and standards (e.g. ASHRAE 90.1, Title 24 and CALGreen). This senior-level role presents a unique opportunity to contribute to impactful projects that address the global risks of climate change through sustainable infrastructure delivery.

• Serve as a subject‑matter expert on the development and application of energy models for energy code and sustainability rating system compliance (e.g. LEED and Envision)
• Perform simulations to optimize building performance, energy efficiency, and code compliance (Title 24, CALGreen, ASHRAE 90.1).
• Execute energy simulations, efficiency calculations, day lighting analysis, and whole‑life/embodied carbon assessments.
• Prepare and submit documentation for LEED, Envision and other rating systems
• Review design documents and specifications for compliance with LEED and energy codes.
• Evaluate energy conservation measures and propose innovative sustainability solutions.
• Lead or support commissioning for new construction and renovations, ensuring LEED and energy code compliance through design reviews, functional testing, and detailed reporting.
• Provide technical guidance on energy efficiency strategies and sustainable design.
• Coordinate with project teams, including architects, engineers, and project managers, to integrate sustainability goals and optimize building systems for performance and compliance.
• Provide commercial leadership, including budget and contract oversight, ensuring high‑quality deliverables aligned with client expectations
• Participate in industry events, client forums, and external publications to promote the firm’s climate and sustainability expertise.
• Lead business development initiatives to grow the sustainability and climate change portfolio. Including identifying new opportunities, building client relationships, and contributing to proposal development.

• Bachelor’s degree in Mechanical Engineering, Architectural Engineering, Building Science, Sustainability, or related field.
• LEED Accredited Professional (LEED AP BD+C preferred)
• Minimum 10 years of experience in energy modeling for energy code and LEED compliance.
• Strong knowledge of various US state energy codes (e.g. Title 24, CALGreen) and standards requirements (ASHRAE 90.1, 62.1, 55).
• Proficiency in energy modeling software e.g. eQUEST, Energy Plus, One Click LCA, Open Studio
• Experience with Net Zero Energy and high‑performance building design.
• Understanding of mechanical and electrical system design, architecture HVAC, plumbing, construction phases, and rating system portals
• Ability to work both independently and collaboratively in a multidisciplinary team
• Excellent analytical, communication, and stakeholder engagement skills.
• Strong project management capabilities, including budget development, team coordination and contract management.

At Mott Mac Donald, our employees have a stake and a voice in our business, providing them with a direct connection to our success through our personal and group…