Senior Staff Machine Learning Engineer
Core
Lead Reddit's next-generation user understanding initiative to build a unified, high-fidelity user representation powering personalization across Feeds, Search, Notifications, and Ads.
Role type
Senior Staff Machine Learning Engineer (User Modeling & GenAI)
Builds
Unified user representation layer (embeddings, interest models, LLM-based profiles) and large-scale learning/serving infrastructure.
Domain
Social Media / Recommendation Systems / Generative AI
Deliverable
production ML models
Required skills
Large-scale representation learning, User modeling, LLMs and foundation models, System design, Technical strategy, Mentorship
Preferred skills
GenAI shift application, End-to-end system impact, Cross-team collaboration
Technologies
LLMs, Foundation models, MLOps, Embeddings
Responsibilities
Define unified user understanding strategy and long-term technical vision; Lead design and implementation of advanced user models; Evolve user modeling with LLMs for dynamic profiles and intent inference; Build core components for large-scale learning and serving (storage, retrieval, APIs); Partner with product teams to drive adoption and measure impact; Mentor senior engineers and establish engineering best practices.
Seniority
Senior Staff, hands-on IC with strategic leadership
