Member of Technical Staff (Machine Learning Research Engineer)

Perplexity is seeking an experienced Machine Learning Research 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 the search platform and model stack

• Design, train, and optimize large-scale deep learning models using frameworks like PyTorch, leveraging distributed training (e.g., PyTorch Distributed, DeepSpeed, FSDP) and hardware acceleration, with a focus on retrieval and ranking models

• Conduct advanced research in representation learning, including contrastive learning, multilingual, and multimodal modeling for search and retrieval

• Deploy models — from boosting algorithms 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