In the dynamic landscape of On, our technology thrives much like a spirited runner: always moving, always improving. We are building the foundation that allows our engineering organization to scale, innovate, and deliver Wow to athletes worldwide. To power this mission, we are seeking a Senior Site Reliability Engineer (SRE) - Edge who understands that reliability, security, and performance start at the transport layer. You won't just manage a CDN; you will own the architecture and performance of our global entry points, including our Apollo GraphQL API Gateway. You will leverage expert-level knowledge of HTTP/S, TCP, and DNS to optimize for global throughput. This is a hands‑on senior role where you will troubleshoot advanced network bottlenecks, design our future content delivery strategy, and act as the technical authority for our Web Application Firewall (WAF), bot mitigation, and standardized service authentication.