Increasing developer confidence with microservices and API test automation can have dramatic benefits for businesses that rely on mobile apps, APIs, or web platforms. By separating concerns into single-purpose microservices, developers can focus on specific functional areas, reducing errors and increasing release confidence. Microservices also enable faster deployment through rapid iterations, reduced tech debt by mocking and contract testing, and improved scalability through vertical and horizontal segmentation. Additionally, purpose-oriented microservices with black box testing and dynamic data-driven API functional test automation increase confidence in testability, service isolation, replaceability, and overall system performance. Ultimately, embracing innovative API test automation tools can provide trusted feedback loops and global visibility to build developer confidence and drive business success.