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Research Engineer – Cybersecurity RL

Anthropic

$300,000 - $405,000
Dec 9, 2025
San Francisco, CA, US
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Anthropic is looking to create reliable, interpretable, and steerable AI systems, and the Horizons team is playing a critical role in advancing these AI systems, specifically in the area of reinforcement learning (RL) for secure coding, vulnerability remediation, and other areas of defensive cybersecurity.

Requirements

  • Experience in cybersecurity research
  • Experience with machine learning
  • Strong software engineering skills
  • Familiarity with RL techniques and environments
  • Familiarity with LLM training methodologies
  • Professional experience in security engineering, fuzzing, detection and response, or other applied defensive work
  • Experience participating in or building CTF competitions and cyber ranges

Responsibilities

  • Designing and implementing RL environments
  • Conducting experiments and evaluations
  • Delivering work into production training runs
  • Collaborating with other researchers, engineers, and cybersecurity specialists across and outside Anthropic

Other

  • At least a Bachelor's degree in a related field or equivalent experience
  • Location-based hybrid policy: currently, we expect all staff to be in one of our offices at least 25% of the time
  • Visa sponsorship: we do sponsor visas, but we aren't able to successfully sponsor visas for every role and every candidate
  • Strong communication skills
  • Ability to balance research exploration with engineering implementation