Anthropic is seeking a Research Engineer for their Reinforcement Learning Fundamentals team. This role involves collaborating with researchers and engineers to advance the capabilities and safety of large language models through fundamental research in reinforcement learning. Key responsibilities include developing novel RL techniques, creating tools for models to perform complex tasks, and enhancing reasoning capabilities in areas like code generation and mathematics. The ideal candidate should have 5+ years of industry experience, proficiency in Python and deep learning frameworks, strong software engineering skills, and a passion for AI safety. The role offers competitive compensation, including a salary range of $340,000 - $425,000 USD, along with equity and comprehensive benefits. Anthropic values diversity and encourages applications from underrepresented groups. The position requires 25% in-office presence in San Francisco, CA, with visa sponsorship available for eligible candidates. This role presents an opportunity to work on cutting-edge AI research with potential for significant societal impact.