Transitioning to microservices offers teams building large applications the ability to innovate and deploy rapidly while enhancing security through zero-trust architecture. This shift from monolithic codebases allows for the compartmentalization of resources into individual services, each exposing an API over the network, which can be secured by implementing a zero-trust model. Zero-trust security requires assigning identities to services and setting permissions, which can be efficiently managed using service meshes like Kuma. Kuma, an open-source service mesh, leverages the Envoy proxy to support zero-trust security across multi-cloud and multi-cluster environments, simplifying the implementation of security policies such as mutual TLS (mTLS) and Traffic Permissions. By using Kuma, organizations can automate TLS certificate issuance and rotation, allowing application teams to focus on building services while infrastructure architects maintain control over connectivity without needing to develop bespoke network management solutions. The adoption of service mesh patterns enables reliable and portable security implementations, ultimately increasing the efficiency of application development and deployment.