Senior Sustainability Engineer London CTJ64 GBP45,000 : GBP55,000 A leading, sustainability:driven building services consultancy is looking to appoint a Senior Sustainability Engineer to join its London team. This is an excellent opportunity for a skilled professional with a strong background in building performance modelling and low:carbon design, particularly with hands:on experience using IES:VE and Apache HVAC. Key Responsibilities * Lead the development of dynamic simulation models using IES:VE, including detailed HVAC system modelling with Apache HVAC * Deliver performance analysis for energy, thermal comfort, daylighting, and overheating (TM52/TM59) * Prepare technical reports and sustainability documentation to support planning and compliance (e.g., Part L, London Plan, BREEAM inputs) * Liaise with clients, design teams, and project stakeholders to deliver integrated, low:energy solutions * Contribute to design reviews, project coordination, and internal knowledge sharing * Mentor junior modellers and contribute to the growth of the building physics capability within the team Candidate Profile * Minimum 3 years experience in building physics, sustainability consultancy, or building services engineering * Degree in Building Services, Environmental Engineering, Mechanical Engineering, Architecture, or related field * Proficient in IES:VE with solid experience using Apache HVAC for DSM and system modelling * Strong understanding of UK Building Regulations, energy strategies, and compliance assessments * Confident communicator with strong reporting and client:facing skills * Right to work in the UK and based in or near London (or open to relocation) Whats on Offer * Competitive salary between GBP40,000 : GBP55,000, depending on experience * Hybrid working and flexible hours * Clear pathway to Associate:level roles and chartership (e.g., CIBSE, LETI, LCC) * Involvement in high:profile, sustainability:led projects across sectors * Friendly and forward:thinking team with a focus on environmental innovation or learn more, Callum Jones at Penguin Recruitment via