Explore how Julia's backend accelerates model-based app development in this JuliaCon 2024 conference talk. Discover the solution to the dual language problem, which often hinders engineers and developers when integrating mathematical models into deployable applications. Learn about the productivity gains offered by Julia's approach, enabling a paradigm shift in model-based app development. Follow a demonstration of developing a model using ModelingToolkit.jl and integrating it into a C# Windows-based desktop application. Witness the efficiency of fixing model bugs in real-time and compare this workflow to a Modelica approach, showcasing the significant improvements in development efficiency achieved with Julia.