How does API-led connectivity improve developer productivity?

API-led connectivity fundamentally enhances developer productivity primarily through the promotion of collaboration and reuse. When APIs are designed with a clear structure and purpose, they facilitate a modular approach to building applications. This modularity allows different teams to work on various components of a project independently, fostering collaboration.

Moreover, by creating reusable APIs, developers can avoid duplicating efforts across projects. They can leverage existing APIs for new applications, which significantly reduces development time and eliminates the need to start from scratch every time. As a result, teams can focus on delivering value rather than reinventing the wheel, leading to greater efficiency and faster delivery of integrated solutions.

The other options do not encapsulate the core benefits of API-led connectivity in terms of developer productivity. Increasing server speed, simplifying user interfaces, and ensuring redundancy in services, while important in their own contexts, do not directly relate to enhancing how developers work together or how they can efficiently utilize existing resources. Thus, the promotion of collaboration and the reuse of APIs stand out as the most impactful aspects contributing to greater productivity for developers in an API-led approach.