Internship - Machine Learning Research Engineer
- 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
- Member of Technical Staff (Search Crawler Analyst) posted Oct 8
- Member of Technical Staff (Machine Learning Engineer, Search & Agents) posted Oct 6
- Member of Technical Staff (Search Core DevOps Engineer) posted Sep 25
- Member of Technical Staff (Machine Learning Research Engineer) posted Sep 23
- Member of Technical Staff (Search Core, Indexing & Data Pipeline Stream) posted Sep 18
- Member of Technical Staff (Search Quality Analyst) posted Sep 2
- Member of Technical Staff (Machine Learning Engineer, Ranking Quality - Search) posted Aug 12
- Internship - Search Backend Infra Engineer posted Jul 1
- Internship - Search Machine Learning Engineer posted Apr 8
- Internship - Search Machine Learning Engineer posted Jan 13
- Member of Technical Staff (Backend Software Engineer, Search Crawler) posted Jul 28
- Member of Technical Staff (Search Engine Developer, Search Core) posted Mar 31
- Member of Technical Staff (Machine Learning Engineer, Search) posted Mar 25
- Member of Technical Staff (Backend/Infrastructure Engineer, Search) posted Mar 7
From the team and dates on Perplexity's own job board.
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