Staff Software Engineer - Ads

Great advertising connects merchants with customers who genuinely need what they're selling. As a Staff Software Engineer focused on Ads, you'll build the targeting and personalization technology that makes these meaningful connections happen at scale. You'll develop state of the art ad platform features that help merchants reach the right audience at exactly the right moment, creating advertising experiences that drive real business growth while respecting the customer experience. Key Responsibilities: Design and optimize real‑time ad serving, auction, and ranking systems with p99 latency targets. Solve complex ad performance problems to identify optimization opportunities that impact millions Collaborate closely with advertising data teams to integrate data driven solutions seamlessly into our ad platform Ship experimentation tooling for ad A/B testing Document technical insights and share best practices across engineering teams Participate in on-call work to ensure reliability and performance of Shopify’s ad systems. Qualifications: Strong Engineering proficiency and a passion for exploring the limits of technology Strong with streaming and low‑latency systems: Kafka, Flink/Spark Streaming; feature stores; high‑QPS caches/KV stores (Redis/Aerospike/RocksDB) Experience in building scalable, ad-centric applications that enhance the commerce experience Demonstrated problem-solving abilities and innovative thinking in ad technology solutions Excellent communication skills to convey technical ideas effectively A growth-oriented mindset, constantly seeking to improve and innovate. Nice to have: Fluency in ads metrics and levers: CTR, CVR, CPC/CPM/CPA, eCPM, ROAS, LTV, win rate, fill rate, pacing accuracy—and how to move them. At Shopify, we pride ourselves on moving quickly—not just in shipping, but in our hiring process as well. If you're ready to apply, please be prepared to interview with us within the week. Our goal is to complete the entire interview loop within 30 days. You will be expected to complete a live pair programming session, come prepared with your own IDE. This role may require on-call work Ready to connect merchants with their perfect customers? Join the team that's making commerce better for everyone.