Synced from Ashby · Sep 2

Machine Learning Research Engineer

PerplexityBerlinPosted Sep 2, 2026
Machine Learning EngineerRemoteIntern
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Mirrored from Perplexity's own Ashby careers system · refreshed hourly

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Sep 2
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Ashby
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Job description

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).

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Based on publicly available information, candidates applying through ashby for roles at Perplexity can generally expect a structured, digital-first process. Applications are typically submitted through an Ashby-hosted careers page, and candidates may receive automated confirmation upon submission. The process commonly begins with an initial resume or application screen, potentially followed by a recruiter conversation to discuss background and role fit. Depending on the position, candidates may encounter multiple stages, which could include technical assessments, hiring manager discussions, or panel-style interviews relevant to the specific function, such as engineering, product, or business roles. Communication is often handled through email or the Ashby candidate portal, and response times vary depending on team needs and hiring urgency. Candidates are encouraged to review the job posting closely, as specific requirements and evaluation criteria can differ meaningfully across the many open roles.”}}

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Machine Learning Research Engineer
Perplexity · Berlin
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