During the initial phase of my previous job, we needed to launch an integration that linked our service to a third-party application. After the deployment, we began noticing errors in our service logs. Eventually, we discovered that our new code was causing the third-party software to crash, which adversely affected the sales team that depended on this software for their daily operations. We promptly reverted our release and conducted an investigation. After pinpointing the issue in our code, we were able to resolve it within a few hours, thereby restoring the functionality of the third-party application. This experience taught us the significance of thoroughly testing our code, particularly when third-party integrations are involved. Following this incident, we enhanced our quality assurance procedures to implement more stringent testing on new features and releases, especially those that integrate with other systems.