As more organizations adopt microservice architectures to enhance scalability and flexibility, they encounter greater complexities in managing the software development lifecycle (SDLC). One of the key challenges lies in end-to-end (E2E) testing. E2E testing is essential for validating the entire system's functionality from the end user's perspective, requiring all components to be fully available without reliance on mocking or stubbing. However, microservices’ distributed nature can introduce dependencies that complicate diagnosing test failures—especially when different teams manage separate modules. Many organizations have been shifting their testing left, known as the shift-left testing strategy, to catch defects sooner, reducing downstream bottlenecks. In the microservice approach, shift-left testing is particularly challenging as E2E testing occurs after all services are integrated, making it difficult to truly shift left without compromising on the completeness of testing. Companies like Uber, however, have successfully shifted E2E testing left. Their …