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Member of Technical Staff (Machine Learning Research Engineer)

Perplexity

Berlin Full-time Posted 13d ago
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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 * Deep understanding of search and retrieval systems, including quality evaluation principles and metrics * Proven track record with large-scale search or recommender systems * Strong proficiency with PyTorch, including experience in distributed training techniques and performance optimization for large models * Expertise in representation learning, including contrastive learning and embedding space alignment for multilingual and multimodal applications * Strong publication record in AI/ML conferences or workshops (e.g., NeurIPS, ICML, ICLR, ACL, CVPR, SIGIR) * Self-driven, with a strong sense of ownership and execution * Minimum of 3 years (preferably 5+) working on search, recommender systems, or closely related research areas

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