The software engineering landscape is undergoing a significant shift, driven by advancements in AI and automation. The concept of "time between disengagements" measures the duration between human intervention, with increasing autonomy expected to reach hours or even days, mirroring autonomous vehicles. To achieve this, three fundamental barriers must be addressed: security, context, and interaction modes for parallelism and deep work. As software conductors, engineers will need to orchestrate a symphony of agents operating in parallel, requiring new interfaces and interaction modalities that eliminate context-switching friction and support the different levels of engagement developers have with software. The era of high-performance parallel development is upon us, promising sweeping productivity gains and more joy in building software.