About the job
At MapMortar, we have built the capital planning infrastructure for real estate in the climate transition.
Real estate portfolios must make trillion-dollar decisions to decarbonise, manage climate risk and protect asset value. Today, most of those decisions are still made using static reports, spreadsheets and fragmented engineering advice.
MapMortar changes that.
Our agentic modelling technology — developed with University College London — combines physics-based building intelligence with AI to help asset managers, consultants and owners understand financial outcomes, physical feasibility and transition risk across entire portfolios.
We are looking for a Building Performance Engineer who wants to do more than run simulations — someone who wants to shape how those simulations become the foundation of an industry-grade platform.
About the Role
This role sits at the intersection of building-performance engineering and product development.
You will deliver modelling work across live projects and internal initiatives, collaborating closely with our product and engineering teams to refine logic, test new capabilities and embed engineering intelligence into the MapMortar platform.
The work is technical and independent. You will need strong engineering judgment, the ability to communicate complex outputs clearly, and genuine curiosity about how software and AI can elevate what building performance engineering can do.
What You’ll Do
– Deliver building-performance simulations using EnergyPlus and MapMortar’s internal modelling tools
– Draw on experience across simulation environments to produce realistic, industry-aligned outputs
– Translate results into clear insights supporting project delivery and product development
– Work with the development team to test features, validate model behaviour and sharpen engineering logic
– Write lightweight scripts (Python, JavaScript or similar) to automate tasks, manipulate model data and support QA
– Improve modelling assumptions, templates and workflows through applied engineering insight
– Manage tasks, testing cycles and internal requests with a high degree of autonomy
– Advise on Net Zero strategies, compliance pathways and performance outcomes for UK/EU building types
What You’ll Bring
– 3+ years in building-performance engineering or energy modelling
– Strong hands-on experience with EnergyPlus
– Background in building or mechanical engineering, or a related discipline
– Familiarity with other simulation tools and environments
– Basic scripting ability in Python, JavaScript or similar
– Deep understanding of building physics, HVAC systems and energy-efficiency strategies
– Working knowledge of Net Zero Carbon frameworks and decarbonisation approaches
– Solid grasp of UK or European building regulations and energy-performance compliance
– Ability to work independently and communicate clearly across engineering and software teams
Nice to Have
– Experience conducting site audits or building inspections
– Strong working knowledge of EPC methodology, CRREM pathways or similar frameworks
– Prior experience in a tech-enabled or data-driven engineering environment
– Exposure to QA or testing workflows within a software team
– Experience with parametric or optimisation-based modelling
– Familiarity with cloud-based or automated simulation pipelines
Why MapMortar
You’ll join a small, ambitious team working at the intersection of engineering, climate transition and advanced technology.
Your work will directly shape how the industry models building performance, plans capital investment and delivers Net Zero outcomes at portfolio scale.
This is a rare opportunity to do serious engineering work that also defines a category.
To apply for this job email your details to lauren@carbonthirteen.com