Machine Learning Research Engineer - Search - Berlin jobs in United States
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Perplexity · 5 months ago

Machine Learning Research Engineer - Search - Berlin

positionUnited States
timeFull-time
remoteRemote
seniorityMid, Senior Level
date3+ years exp

Perplexity is an AI-powered answer engine founded in December 2022, rapidly growing as a leading AI platform. They are seeking a Senior Machine Learning Research Engineer to develop advanced search technologies, focusing on retrieval and ranking, and to collaborate with various teams for high-quality delivery.

Artificial Intelligence (AI)ChatbotMachine LearningNatural Language ProcessingSearch Engine
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H1B Sponsor Likelynote

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

Qualification

SearchRetrieval systemsLarge-scale search systemsPyTorchRepresentation learningPublication recordSelf-driven

Required

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

Company

Perplexity

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Perplexity is an AI-powered answer engine designed to provide accurate, real-time responses to user queries.
dateFounded in 2022
location
San Francisco, California, USA
people-size201-500 employees
web-link
https://www.perplexity.ai

H1B Sponsorship

Perplexity has a track record of offering H1B sponsorships. Please note that this does not guarantee sponsorship for this specific role. Below presents additional info for your reference. (Data Powered by US Department of Labor)
Distribution of Different Job Fields Receiving Sponsorship
Represents job field similar to this job
Trends of Total Sponsorships
2025 (12)
2024 (7)
2023 (2)

Funding

Current Stage
Late Stage
Total Funding
$1.48B
Key Investors
Cristiano RonaldoNuVenturesAccel
2025-12-05Undisclosed
2025-09-10Series Unknown· $200M
2025-08-15Secondary Market

Leadership Team

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Aravind Srinivas
Cofounder, President, CEO
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Denis Yarats
Co-Founder & CTO
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Recent News

Business Wire
BlueMatrix and Perplexity Partner to Bring AI-Powered Discovery to Institutional Research
2026-01-15
SiliconANGLE
Google debuts Universal Commerce Protocol to streamline agentic shopping automation
2026-01-12
Business Insider
The AI industry is getting into politics. Here are the key super PACs to watch in 2026.
2026-01-11
Company data provided by crunchbase