Search Senior Machine Learning Engineer (AI)

TL;DR

Senior Machine Learning Engineer (AI): Building and optimizing advanced search technologies with an accent on retrieval and ranking. Focus on training and deploying LLMs, optimizing RAG pipelines, and ensuring scalable and performant model deployment.

Location: Hybrid (London, Belgrade, Berlin)

Company

Perplexity is seeking an experienced Senior Machine Learning Engineer to help build the next generation of advanced search technologies.

What you will do

• Push search quality forward through models, data, and tools.
• Architect and build core components of the 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.

Requirements

• 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.