Senior / Principal Building Physics Engineer Location: London (Hybrid) Salary: Up to 65k Are you passionate about delivering low-energy, high-performance buildings? A leading global architectural, engineering, and construction consultancy is seeking a Senior or Principal Building Physics Engineer to join its London team, supporting projects across Europe, the USA, and Asia. You''ll play a pivotal role in the development and delivery of thermal and energy modelling strategies for commercial interiors and complex buildings. With a strong background in building physics, energy modelling, and sustainable design, you''ll collaborate with architects, engineers, and sustainability consultants to develop data-driven design solutions that support Net Zero ambitions and industry-leading performance. What you''ll be doing: Deliver advanced energy and thermal simulations using IES-VE, EnergyPlus, or DesignBuilder Apply UK and international standards including Part L, TM54, TM52, TM59, ASHRAE 90.1, and LEED/BREEAM guidelines Lead operational energy modelling, overheating analysis, thermal comfort, and passive design assessments Conduct feasibility studies, Life Cycle Assessments (LCA), and renewable energy simulations Support carbon footprinting and Net Zero carbon strategies Mentor junior engineers and contribute to knowledge-sharing across the team Present energy strategies and modelling outcomes clearly to both technical and non-technical stakeholders About You: 8+ years'' ..... full job details .....