Senior Staff Machine Learning Engineer

Senior Staff Machine Learning Engineer leading the technical direction for AI-first experiences, including ranking and relevance systems that sit at the core of ads marketplace decisioning. Design and build next-generation AI-first ranking systems using sequence modeling, deep learning, and large language models (LLMs). Own the full model lifecycle from research to production, including data analysis, model development, offline/online A/B testing, and continuous iteration. Partner closely with product managers, data scientists, and designers to ensure AI-driven systems deliver meaningful, user-facing improvements. Stay at the forefront of ML/AI innovation by assessing emerging research and translating approaches into scalable, production-ready systems. Qualified candidates will have 5+ years of experience in ML/AI at scale, strong programming skills (Python, Java, or C++), and experience with ML frameworks (PyTorch, TensorFlow, XGBoost); BS/MS/PhD in CS/Engineering or equivalent practical experience. Bonus points for LLM-based system design, retrieval-augmented generation, and contributions to ML open-source/publiations; compensation includes base salary plus equity and a comprehensive benefits package.