I use Istio to secure east-west traffic between my microservices, ensuring that only legitimate traffic flows between them and blocking unwanted traffic. I appreciate that it enables mutual TLS, providing additional security. I like the way Istio allows connectivity between microservices, especially as we transition from traditional three-tier web architecture to microservices architecture. It also offers both security and tracing capabilities, which are crucial. Also, while Kiali was helpful before, now I find Jaeger does a great job.

What engineers love about Istio in 2026 is how it moves complex networking logic out of the application code and into the infrastructure layer transparently. Zero-Trust Security & Observability: It provides automatic mTLS encryption and deep "Golden Signal" metrics (latency, errors, traffic) for every service-to-service interaction without touching a single line of your code. Ambient Mode Efficiency: The shift to sidecar-less "Ambient Mode" significantly reduces resource overhead and operational friction, finally making enterprise-grade traffic management lightweight and easy to maintain.

With Istio Kubernetes operator, it is easy to deploy in any Kubernetes cluster, providing end-to-end traffic visibility and core features like traffic management and security. The Istio sidecar proxy container will be injected into the pod without any modification to the application we run.