Member of Technical Staff (Machine Learning Engineer, Ranking Quality - Search)

Perplexity is looking for a Machine Learning Engineer to enhance search quality through innovative ranking solutions. Join us to tackle complex challenges in search and recommender systems. 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.

• •Relentlessly 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.