Perplexity

Internship - Machine Learning Research Engineer

Berlin
Level
Intern
Work type
Hybrid · Berlin

Not stated in the posting: salary, visa.

Open. First seen 6 November 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 88 open postings.

Standard for data science / ML roles

PyTorch

Common in data science / ML postings at any company.

Compared with Perplexity's other open jobs.

The team: Search HIRES STEADILY

This role is one of 32 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

Rust (18 of 32), LLM (16 of 32), Machine Learning (14 of 32), Python (14 of 32), AWS (12 of 32), C++ (12 of 32), Kubernetes (12 of 32)

OTHER ROLES ON THIS TEAM

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

Other openings for this role

2 open postings for this role in Berlin, first posted 9 September 2026. The company is likely hiring for more than one position. None has been taken down and posted again.

Similar jobs

More jobs like this

Is this your posting? Email info@careerholo.com to have it removed.