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Senior Machine Learning Engineer - Search - London Greater London Area 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. Responsibilities Relentlessly push search quality forward—through models, data, tools, or any other leverage available Architect and build core components of our search platform and model stack Train and evaluate retrieval, ranking and classification models, including LLMs Deploy models - from boosting to LLMs - in a scalable and performant way Build and optimize RAG pipelines for grounding and answer generation Collaborate with Data, AI, Infrastructure and Product teams to ensure fast and high quality delivery Qualifications Deep understanding of search and retrieval systems, including quality evaluation principles and metrics Proven track record with large-scale search or recommender systems Hands-on experience with transformer-based models for dense retrieval, ranking, and classification in large-scale search systems Master’s degree or PhD in Engineering, Computer Science, Math, Physics, or a related field. 8 years of experience in software development and with data structures/algorithms in either (C, C++, Python, Java, Go or Rust). 5 years of experience with ML design and ML infrastructure (e.g., model deployment, model evaluation, data processing, debugging, fine tuning). 5 years of experience designing, training, and evaluating machine learning models. 3 years of experience in a technical leadership role leading project teams and setting technical direction. Self-driven, with a strong sense of ownership and execution Our cash compensation range for this role is $160,000 - $250,000. Final offer amounts are determined by multiple factors, including, experience and expertise, and may vary from the amounts listed above. Equity: In addition to the base salary, equity is part of the total compensation package. Apply for this job #J-18808-Ljbffr