Reporting into the Head of Ad Sales, the Ad Sales Lead, Programmatic will build a deal‑led book of business with agency holding companies, independent agencies, and advertisers who want access to Duolingo’s native formats, first‑party learner signals, and one of the most engaged mobile audiences in the world. Become the person holdco programmatic teams call about mobile app inventory: run joint business planning; get Duolingo onto preferred supply paths, curated marketplaces, and principal/outcome‑based buys; and defend our position when buyers consolidate.