Network calls fail in ways function calls never do - and once a monolith becomes microservices, reliability problems show up fast: retries amplify load, latency spikes cascade, and “what talks to what?” becomes hard to answer.

William Morgan, co-creator of Linkerd and the person who coined “service mesh,” breaks down what service meshes actually solve for platform teams running Kubernetes at scale. The conversation focuses on practical outcomes: improving reliability between services, getting uniform observability without rewriting every app, and handling gaps Kubernetes doesn’t cover well - like gRPC/HTTP2 load balancing and cross-environment communication.

Key topics

• Why reliability is the first “microservices tax” (timeouts, retries, backoff, cascading failure)
• What Kubernetes does not solve at the networking layer—and where a service mesh fits
• gRPC/HTTP2 load balancing problems and why L4 balancing can fall short
• Service-to-service visibility: understanding traffic flows and performance without per-app instrumentation
• Cost and resilience tradeoffs with multi-AZ Kubernetes on AWS (and how zonal-aware balancing can help)
• Whether developers should ever need to interact with service mesh configuration
• Where zero trust and policy controls belong: platform guardrails vs application ownership

Guest: William Morgan, CEO at Buoyant, Co-Creator of Linkerd

William Morgan brings a unique take on platform engineering, security, and traffic management in cloud native environments. William’s the mind behind Linkerd, the CNCF graduate service mesh born to make security, observability, and reliability "just work" for modern apps without all that heavy overhead. With roots as an infrastructure engineer at Twitter, where he was hands-on in the shift to microservices, and experience at Microsoft, Powerset, Adap.tv, and MITRE, William understands operational complexity better than most. His perspective on reducing unpredictable cloud spend with features like Linkerd’s High Availability Zonal Load Balancing is timely for any team wrestling with multi-AZ cloud bills.

William has hands-on knowledge of MCP, the protocol now critical for securing enterprise AI traffic. He also has strong views on sustainable open source business models, having contributed to open source for over 20 years.

William Morgan, BlueSky

Buoyant, Website

Buoyant, LinkedIn

Buoyant, YouTube

Linkerd, GitHub

Links to interesting things from this episode:

• The Service Mesh Landscape