• Design and train advanced ML models (e.g., DNNs, transformers) to power Reddit Ads Ranking models. • Develop and optimize features including embeddings, contextual signals, and cross-session behavior. • Own experimentation strategy: offline metrics, A/B design, readouts, and “next iteration” planning. • Work closely with product, infra, and data teams to drive end-to-end model deployment and performance analysis. • Mentor other MLEs and contribute to modeling best practices across the org. • Shape the long-term modeling vision across one or more domains (conversion, app ads, shopping, brand, etc.).