Modern applications often consist of a complex web of interdependent services, especially when using microservices architectures that allow for isolated and independently managed service components. These services, while offering benefits like scalability and independent deployment, introduce dependencies that can become points of failure if not properly managed. The article discusses the importance of understanding and mapping these dependencies, the risks associated with tightly coupled dependencies, and methods to identify them, such as service definitions, manual code inspection, and network traffic analysis. Tools like Gremlin's Reliability Management can aid in discovering hidden dependencies and testing service resilience by simulating dependency failures, ensuring applications can maintain reliability even when dependencies falter. By proactively managing dependencies and assuming potential failures, developers can create robust, resilient systems that minimize service disruptions.