Shifting security left is a crucial aspect of building a cloud native bank, allowing Lunar to prioritize security earlier in the software development lifecycle and empower its developers through security tooling. By adopting a microservices architecture and using tools like Snyk, Lunar has improved the security of its services without slowing down development. The company's shift left approach enables transparent ownership over each microservice, ensuring that every team member is responsible for the entire service, from design to deployment. This approach has allowed Lunar to meet compliance requirements as a licensed bank while releasing 25 production builds per day.