Software development is at the core a human activity - and the created artifacts are among the most complex humankind has ever produced. In this talk, Xin Yao will tell a transformation story at a large Nordic bank through the systems thinking lens. Three themes will be touched upon using the story as a backdrop: systems thinking basics, system dynamics modeling and systems changes. Systems change require our full humanity, and profound changes are often both deeply personal and deeply systemic. In a world that is interconnected by software, to survive and thrive, we need high technical sophistication and high human sophistication to come together to shape a better future.