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AI Researcher

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Perplexity

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Location:
United States , San Francisco ▼

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Category:
IT - Software Development

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Contract Type:
Not provided

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Salary:

210000.00 - 470000.00 USD / Year
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Job Description:

Perplexity is seeking top-tier AI Research Scientists and Engineers to advance our AI products and capabilities. We're building the future of AI-powered search and agent experiences through our Sonar models, Deep Research Agent, Comet Agent, and Search products. Join us in creating SOTA experiences that handle hundreds of millions of queries and continue to scale rapidly.

Job Responsibility:

  • Post-train SOTA LLMs using the latest supervised and reinforcement learning techniques (SFT/DPO/GRPO)
  • Leverage our rich query/answer dataset to scale model performance across Sonar, Deep Research, Comet, and Search products
  • Stay current with the latest LLM research, especially in model training, optimization, and personalization techniques
  • Implement preference optimization and personalization capabilities to enhance user experience
  • Invent in-house improvements and optimizations to enhance SOTA models
  • Turn research ideas into algorithms and run experiments to launch new models
  • Own full-stack data, training, and evaluation pipelines required for model development
  • Build robust and effective training frameworks (on top of Megatron/PyTorch) for post-training LLMs
  • Implement necessary infrastructure and components to support cutting-edge model training at scale
  • Integrate models seamlessly into our product ecosystem
  • Work closely with engineering teams to integrate models into Perplexity's product suite
  • Collaborate across teams to ensure cohesive AI experiences throughout our platform
  • Partner with product teams to understand user needs and translate them into model improvements

Requirements:

  • Proven experience with large-scale LLMs and Deep Learning systems
  • Strong programming skills in Python/PyTorch
  • Experience with post-training techniques and reinforcement learning
  • Self-starter with a willingness to take ownership of tasks
  • Passion for tackling challenging problems
  • Minimum 2-6 years of experience on relevant projects (depending on seniority level)

Nice to have:

  • PhD in Machine Learning, AI, Systems, or related areas
  • Experience in post-training LLMs with SFT/DPO/GRPO
  • C++/CUDA programming skills
  • Experience building LLM training frameworks
  • Academic publications and research impact
  • Experience with agent systems and multi-step reasoning
  • Background in personalization and preference learning
What we offer:
  • Equity
  • Health
  • Dental
  • Vision
  • Retirement
  • Fitness
  • Commuter and dependent care accounts

Additional Information:

Job Posted:
February 21, 2026

Employment Type:
Fulltime
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