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. As a Staff Site Reliability Engineer, you will provide technical leadership for reliability across a large-scale advertising technology ecosystem. You will help ensure critical systems remain highly available, scalable, performant, and resilient as traffic and business demands grow. Your scope will span ad serving, auctions, targeting, reporting, measurement, and billing, with direct impact on revenue and customer experience. You will partner with engineering leaders and multiple technical teams to establish reliability roadmaps, architecture standards, and operational practices. The role combines hands-on engineering, automation, incident leadership, observability, and long-term resilience initiatives. You will also mentor engineers and influence technical decisions across a broad organization. This is an opportunity to shape reliability strategy for high-QPS, low-latency systems where operational excellence directly drives business outcomes.