The Senior Site Reliability Engineer improves production reliability, resilience, and system availability. Responsibilities include operating Linux and Kubernetes infrastructure, automating workflows, developing tools, managing observability, responding to incidents, participating in on-call rotations, writing runbooks, and conducting blameless postmortems. The role collaborates with distributed teams and stakeholders, supports cloud infrastructure, troubleshoots live systems, and promotes DevOps and SRE best practices.