Perplexity is seeking an experienced Machine Learning Engineer to improve search quality across the middle and later stages of ranking. We are looking for a strong ranking generalist who can own ambiguous problems end to end and brings exceptional depth in either neural ranking or production ranking systems. Responsibilities • Push search quality forward through models, data, evaluation, infrastructure, or any other leverage available. • Own ranking-quality problems end to end: define the evaluation, identify the bottleneck, build the solution, and ship it safely. • Train and evaluate retrieval, ranking, and classification models, including neural and LLM-based approaches where appropriate. • Build and operate ranking infrastructure, including feature computation, low-latency inference, multi-stage cascades, deployment, and monitoring. • Make sound trade-offs across quality, latency, reliability, cost, and engineering complexity. • Collaborate across Data, AI, Infrastructure, and Product while retaining ownership of the final quality outcome. Qualifications • Deep understanding of search or recommender systems and their evaluation. • Proven ownership of a large-scale production ranking system or a substantial class of quality problems. • Strong machine learning and software engineering skills across data, models, serving, and monitoring. • Ability to drive ambiguous, cross-team problems without continuous task decomposition. • Exceptional depth in either modern neural ranking methods or low-latency ranking systems and runtime.