Search Senior Machine Learning Engineer (London, Belgrade, Berlin)

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

- Self-driven, with a strong sense of ownership and execution

- Minimum of 5 years of working on search or recsys-related projects