We need to decarbonize the entire world of software and software engineering. In this session, we will give an overview about the various aspects of software engineering and what their impact on carbon emissions is. We will look into the energy consumption of software and learn what we can do in order to engineer software for a low carbon footprint. We will uncover some obvious, but often forgotten aspects of running zombie software and evaluate their impact on carbon emissions and energy consumption. We will talk about how to choose the right data center for your needs and what makes this difficult nowadays. We will give a brief overview of a few innovations happening in this space of carbon-efficient software engineering (e.g. Kubernetes schedulers, Spring Native, and more...) with the goal to ignite the audience for more innovations in this space and plant a seed. Let’s tackle this huge opportunity in front of us all to shape the future (of software) in a sustainable way.