Member of Technical Staff (Machine Learning Engineer, Search Agent RL)
Perplexity1 month ago
Berlin, Germany or London, United KingdomSenior
Responsibilities
- Improve search and agent quality through model, training-data, tool, and system-design improvements.
- Develop LLM post-training and reinforcement learning methods for reasoning, search, tool use, and task completion.
- Train and evaluate multi-agent systems, including agent coordination and information sharing.
- Design and build agent harnesses, context-management systems, execution environments, and orchestration.
- Improve retrieval and ranking models and the search interfaces used by agents.
- Build datasets, reward signals, and evaluations to identify failures and guide improvements.
- Own experiments from hypothesis through scalable training, deployment, and measurement of quality, latency, and cost.
- Collaborate with AI, Search, Infrastructure, Data, and Product teams to bring capabilities into production.
Requirements
- Strong track record of building and shipping machine learning systems.
- Deep experience in one or more of LLM post-training, reinforcement learning, search and retrieval, or agent systems.
- Strong software engineering skills across model training, experimentation infrastructure, and production systems.
- Experience designing rigorous evaluations, diagnosing failures, and translating experimental results into practical improvements.
- Ability to work on open-ended problems requiring research judgment and hands-on engineering.
- Preferred experience with tool-using models, multi-agent training or evaluation, agent harnesses, distributed training, scalable inference, retrieval, ranking, or recommendation systems.
Categories
About Perplexity
Perplexity builds an AI-powered answer engine for web and mobile and an enterprise product, Perplexity Computer, for AI-driven workflows across tools and apps. The company monetizes through individual subscriptions (Perplexity Pro) and enterprise plans. Founded in 2022 and headquartered in San Francisco, it operates as a privately held company.