Mikolaj Pawlikowski, speaking at Chaos Conf 2018, detailed Bloomberg's experience with Chaos Engineering, emphasizing the challenges of managing distributed systems on their DTP microservices platform. To tackle these challenges, his team developed PowerfulSeal, a tool designed to introduce controlled chaos into Kubernetes environments. Unlike Chaos Monkey, PowerfulSeal offers greater customization and operates in four modes: interactive, label, demo, and autonomous, each providing various levels of control and automation over system disturbances. The tool is aimed at increasing confidence in system reliability by simulating failures and identifying weaknesses, rather than proving system robustness outright. Pawlikowski highlighted the importance of convincing management of the necessity of such practices, often citing the inevitability of system failures due to scale. PowerfulSeal, open-sourced at Kubecon, invites user feedback to improve its utility in identifying and addressing system vulnerabilities.