In this talk, we will delve into essential design best practices for building resilient and configurable systems. We will explore fallbacks as a strategy to handle failures, including correlated failures, where multiple components fail simultaneously. We will discuss how to implement constant work patterns to maintain consistent performance under varying loads. Additionally, we will delve into the significance of configuration management and its impact on system behavior. We will explore design patterns such as the sidecar pattern for modular and scalable architectures and the circuit breaker pattern for fault tolerance. Join us to learn how these design best practices can enhance the reliability, flexibility, and resilience of your systems.