This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Staff Site Reliability Engineer, Ads based in United States. This is a senior technical leadership role focused on strengthening the reliability of a large-scale advertising ecosystem. You’ll shape reliability strategy across critical systems spanning ad serving, auctions, targeting, reporting, measurement, and billing. The role combines hands-on engineering with architecture, automation, incident leadership, and long-term platform resilience. You’ll partner with engineering leaders and multiple technical teams to influence roadmaps and improve operational excellence. Your work will directly support highly available, low-latency systems where reliability and performance have meaningful business impact. You’ll also mentor engineers and help establish measurable reliability practices across a broad, distributed technology environment. The position offers significant ownership and the opportunity to define how reliability engineering evolves at organizational scale.