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Perplexity

Internship - Machine Learning Research Engineer

Berlin
Level
Intern
Work type
Hybrid · Berlin

Not stated in the posting: salary, visa.

Open. First seen 9 September 2026.

About the role

Internship Program Berlin

Internship program: 12 - 24 weeks, full-time, in-person in the Berlin office.

Responsibilities

  • Relentlessly push search quality forward — through models, data, tools, or any other leverage available.
  • 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 research in representation learning, including contrastive learning, multilingual, evaluation, and multimodal modeling for search and retrieval.
  • Build and optimize RAG pipelines for grounding and answer generation.

Qualifications

  • Understanding of search and retrieval systems, including quality evaluation principles and metrics.
  • Strong proficiency with PyTorch, including experience in distributed training techniques and performance optimization for large models.
  • Interested in representation learning, including contrastive learning, dense & sparse vector representations, representation fusion, cross-lingual representation alignment, training data optimization and robust evaluation.
  • Publication record in AI/ML conferences or workshops (e.g., NeurIPS, ICML, ICLR, ACL, EMNLP, SIGIR).

What this role asks for

Particular to this role

Deep Learning · RAG

Rare in Perplexity's other 85 open postings.

Standard for data science / ML roles

PyTorch

Common in data science / ML postings at any company.

Read against Perplexity's other open postings on this site.

The team: Search HIRES STEADILY

This role is one of 15 open in Search. 4 were posted in the last 30 days and the oldest in March: a team that hires all year rather than one being built.

WHAT THE TEAM WORKS WITH, ACROSS ITS POSTINGS

LLM (8 of 15), Rust (8 of 15), Machine Learning (7 of 15), Python (7 of 15), AWS (6 of 15), C++ (5 of 15), Kubernetes (5 of 15)

OTHER ROLES ON THIS TEAM

From the team and dates on Perplexity's own job board.

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