Principal Machine Learning Engineer, Recommendations

About Vumedi: Vumedi is the world's largest video education platform for physicians, trusted by more than 250,000 doctors worldwide to stay current on the latest clinical research, surgical techniques, and medical innovations. Every day, physicians come to Vumedi looking for the right knowledge at the right moment, whether they're preparing for a procedure, researching a rare condition, or learning from experts across thousands of specialties. We're building the next generation of that experience. Our vision is to transform how doctors discover medical knowledge by combining large language models, retrieval systems, semantic search, and personalized recommendations into an intelligent learning platform unlike anything else in healthcare. If you've built recommendation systems, search platforms, ranking algorithms, or AI-powered discovery experiences, we'd love to talk. The Opportunity: We're looking for a Principal ML Engineer to lead the architecture and development of Vumedi's AI-powered discovery platform. This isn't about adding an AI feature to an existing product. You'll help define how hundreds of thousands of physicians discover knowledge through intelligent retrieval, semantic search, personalized recommendations, and LLM-powered experiences. Working directly with our CTO, you'll have significant influence over both technical strategy and implementation: from evaluating emerging AI technologies to designing production systems that deliver highly relevant educational content at scale. This is a rare opportunity to apply modern AI techniques to a mission that directly improves patient care around the world. What You'll Build: You'll own the technical direction behind Vumedi's next-generation discovery platform, including: • Designing intelligent recommendation systems that personalize educational content for physicians. • Building LLM-powered discovery experiences that understand clinical intent and not just keywords. • Developing semantic search, retrieval, ranking, and recommendation pipelines using embeddings, vector search, and modern retrieval architectures. • Designing production-grade knowledge graph RAG systems that combine medical knowledge with generative AI. • Evaluating and implementing emerging AI technologies, frameworks, and infrastructure as the ecosystem rapidly evolves. • Building scalable inference and retrieval services capable of serving physicians around the world. • Partnering closely with Product, Data Science, and Engineering to rapidly prototype, iterate, and launch new AI capabilities. • Defining the long-term technical architecture for AI across the Vumedi platform. While this is a Principal-level architecture role, we're looking for someone who enjoys building. You'll move comfortably between whiteboard discussions, architectural design, experimentation, and production code. What We're Looking For: We're less interested in checking every technology box than finding someone who has built intelligent discovery systems at scale. Ideal candidates have experience building one or more of the following: • Recommendation systems • Search relevance and ranking • Semantic search • Retrieval-Augmented Generation (RAG) • Vector search and embeddings • Knowledge retrieval systems • Personalized content discovery • AI-powered user experiences You may have worked on products involving: • Content recommendations • Marketplace ranking • Search infrastructure • Feed ranking • Personalized discovery • Knowledge graphs • Enterprise search • AI assistants Technical Experience: We're excited by candidates who have experience with many of the following: • Production experience building LLM-powered applications • Retrieval pipelines, embeddings, and vector databases • Mode