Build the service mesh powering Roblox's hybrid Cloud Bursting infrastructure

Roblox's Application Networking team is hiring a senior engineer for the Service Mesh team to build the networking fabric behind Cloud Bursting — letting core services transparently burst from on-prem data centers to the cloud. You'll own service mesh integration with Kubernetes (sidecar injection, mTLS, traffic policies, observability) and be a primary escalation point for Envoy/Istio issues at billions-of-requests scale.

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What this interview tests

Service mesh architecture (Istio/Envoy/Consul/Linkerd) and sidecar tradeoffs
Multi-cluster, multi-region traffic management and service discovery
Kubernetes networking model and production operations
Envoy proxy internals and xDS control plane APIs
mTLS, traffic policies, and observability at scale
On-call incident response and reliability-first mindset

Common question themes

Design a service mesh for hybrid on-prem + cloud bursting

Debug a production mTLS or sidecar injection failure

Explain Envoy xDS control plane architecture

Tradeoffs of sidecar-based mesh vs. alternatives at scale

Mentoring junior engineers on mesh/networking best practices

How candidates describe it

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