Chaos Engineering is a pivotal discipline in validating AWS cost-saving measures, ensuring system resilience and performance are not compromised. It involves intentionally simulating failures to test the robustness of systems against unexpected conditions, enabling organizations to confidently optimize cloud spending without affecting customer experience. Harness Chaos Engineering offers experiments to assess auto-scaling, Spot Instance compatibility, and critical resource dependency, which support cloud optimization efforts. By using Chaos Engineering to test scenarios such as rightsizing compute resources, switching between on-demand and Spot Instances, and identifying unused resources for termination, organizations can maximize their AWS investment. The approach helps verify that cost reductions do not disrupt essential services. Additionally, the free plan for Harness Chaos Engineering allows users to conduct chaos experiments indefinitely, promoting resilience verification and offering financial benefits through improved system reliability and reduced downtime.