Member of Technical Staff (AI Researcher)

San Franciscofull timeOn Site

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senior

$220k–$485k

H1B: yes

Perplexity Member of Technical Staff (AI Researcher) at Perplexity focused on advancing AI products through research and development of large-scale LLMs. Responsibilities include post-training, model optimization, and building training infrastructure.

Responsibilities

Research & Development
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
Infrastructure & Implementation
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

Qualification

PhD in Machine LearningC++/CUDA programming skills

Required

Proven experience with large-scale LLMs and Deep Learning systems
Strong programming skills in Python/PyTorch; versatility is a plus
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)
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

Preferred

PhD in Machine Learning, AI

Company

Perplexity

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Source: ashby

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LLMsDeep LearningPythonPyTorchMegatronSFT

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Member of Technical Staff (AI Researcher) at Perplexity · LumiJobs