Perplexity
Member of Technical Staff (AI Researcher)
$220K–$485K
San Francisco +4 · Staff · Full-time · Posted Aug 25, 2026
- Location
- San Francisco
Palo Alto
London
Berlin
New York City - Experience
- Minimum 2–6 years on relevant projects, depending on seniority level.
About the job
Researches, trains, and deploys large language models and agent capabilities across Perplexity’s search and agent products.
What you'll do
- Post-train and improve LLMs using supervised and reinforcement learning, preference optimization, and personalization.
- Build data, training, evaluation, and infrastructure pipelines for model development at scale.
- Run research experiments and integrate resulting models into products in collaboration with engineering and product teams.
What they ask for
- Proven experience with large-scale LLMs and deep learning systems.
- Strong programming skills in Python/PyTorch.
- Experience with post-training techniques and reinforcement learning.
- 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 with SFT/DPO/GRPO, C++/CUDA, LLM training frameworks, agent systems, personalization, or academic research impact.
Pay
$220K – $485K (USD, base salary)
Tools
Python, PyTorch, Megatron, SFT, DPO, GRPO, C++, CUDA
AI focus
Develops and post-trains LLMs, builds reinforcement-learning and personalization capabilities, and improves agent products and model-training infrastructure.
Model-written summary · the original posting is authoritative