Financial institutions are increasingly adopting Chaos Engineering to enhance the reliability and modernization of their systems amidst evolving financial regulations and technological advancements. This approach involves deliberately injecting faults into systems to observe and improve their resilience, which is particularly crucial in the financial sector where outages can prevent critical transactions and trades. The technique is employed to ensure smooth migration to modern architectures like cloud environments, while maintaining uptime and managing costs effectively. Chaos Engineering also supports the decoupling of complex microservices architectures, which allows for independent failure and rapid innovation without impacting customer experiences. Moreover, it aids in meeting stringent compliance requirements by rigorously testing system redundancies and updating incident management strategies. By leveraging platforms like Gremlin, financial institutions can run experiments safely, identifying and addressing availability risks before they affect users, thus enabling a balance between innovation and reliability.