Perplexity is seeking an experienced Senior Machine Learning Engineer to help build the next generation of advanced search technologies, with a focus on retrieval and ranking.ResponsibilitiesRelentlessly push search quality forward—through models, data, tools, or any other leverage availableArchitect and build core components of our search platform and model stackTrain and evaluate retrieval, ranking and classification models, including LLMsDeploy models - from boosting to LLMs - in a scalable and performant wayBuild and optimize RAG pipelines for grounding and answer generationCollaborate with Data, AI, Infrastructure and Product teams to ensure fast and high quality deliveryQualificationsDeep understanding of search and retrieval systems, including quality evaluation principles and metricsProven track record with large-scale search or recommender systemsSelf-driven, with a strong sense of ownership and executionMinimum of 5 years of working on search or recsys-related projects