Character.AI
AI & Machine LearningDirect Ashby career site

Research Engineer, AI Safety & Alignment

Location
Redwood City, CA (Remote)
Job type
Full-time
Level
Mid-level
Education
Doctorate
Listed
23 days ago

Skills & highlights for this role

  • machine learning
  • transformers
  • reinforcement learning
  • GPU training and serving

Also useful

  • Kubernetes
  • Docker
  • distributed training
  • explainable AI (XAI)
  • RLHF

About the Role and Team

Joining us as a Research Engineer, you'll be at the forefront of tackling one of the most critical challenges in AI today: safety and alignment. Your work will be pivotal in understanding and mitigating the risks of advanced AI, conducting foundational research to make our models safer, and solving the core technical problems of AI alignment-ensuring our models behave in accordance with human values and intentions.

The Safety team is dedicated to pioneering and implementing techniques that make our models more robust, honest, and harmless. As a Research Engineer, you will bridge the gap between theoretical research and practical application, writing high-quality code to test hypotheses and integrating successful safety solutions directly into our products. Your research will not only protect millions of users but also contribute to the broader scientific community's understanding of how to build safe, beneficial AI.

What You'll Do

  • Develop and implement novel evaluation methodologies and metrics to assess the safety and alignment of large language models.
  • Research and develop cutting-edge techniques for model alignment, value learning, and interpretability.
  • Conduct adversarial testing to proactively uncover potential vulnerabilities and failure modes in our models.
  • Analyze and mitigate biases, toxicity, and other harmful behaviors in large language models through techniques like reinforcement learning from human feedback (RLHF) and fine-tuning.
  • Collaborate with engineering and product teams to translate safety research into practical, scalable solutions and best practices.
  • Stay abreast of the latest advancements in AI safety research and contribute to the academic community through publications and presentations.

Who You Are

  • Hold a PhD (or equivalent experience) in a relevant field such as Computer Science, Machine Learning, or a related discipline.
  • Write clear and clean production-facing and training code
  • Experience working with GPUs (training, serving, debugging)
  • Experience with data pipelines and data infrastructure
  • Strong understanding of modern machine learning techniques, particularly transformers and reinforcement learning, with a focus on their safety implications.
  • Are passionate about the responsible development of AI and dedicated to solving complex safety challenges.

Nice to Have

  • Experience with product experimentation and A/B testing
  • Experience training large models in a distributed setting
  • Familiarity with ML deployment and orchestration (Kubernetes, Docker, cloud)
  • Experience with explainable AI (XAI) and interpretability techniques.
  • Have research in AI safety, alignment, ethics, or a related area.
  • Knowledge of the broader societal and ethical implications of AI, including policy and governance.
  • Publications in relevant academic journals or conferences in the field of machine learning

About Character.AI

Character.AI empowers people to connect, learn and tell stories through interactive entertainment. Our platform lets users engage with tens of millions of characters, enjoy unlimited conversations, and embark on infinite adventures.

In just two years, we achieved unicorn status and were honored as Google Play's AI App of the Year-a testament to our innovative technology and visionary approach.

Join us and be a part of establishing this new entertainment paradigm while shaping the future of Consumer AI!

Read the original posting

From Character.AI's careers page, first listed on Rolev.ai on October 17, 2026. Rolev.ai is not the employer.

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Common questions

Where is the Research Engineer, AI Safety & Alignment job at Character.AI located?

Yes, this Research Engineer, AI Safety & Alignment opening at Character.AI is listed as Redwood City, CA (Remote). Always check Character.AI's application page for specific state eligibility or relocation policies.

What qualifications are required for Research Engineer, AI Safety & Alignment at Character.AI?

For the Research Engineer, AI Safety & Alignment role, Character.AI highlights a doctorate; experience with machine learning, transformers, reinforcement learning, GPU training and serving. Rolev.ai can score your existing resume against these requirements and show any skill gaps before you apply.

How do I apply for the Research Engineer, AI Safety & Alignment position at Character.AI?

This listing links directly to Character.AI's Ashby application page. You can apply directly on Character.AI's site, or use Rolev.ai to check your resume fit, generate a zero-hallucination tailored resume and cover letter for this posting, and autofill the Ashby application form in 1 click with the Rolev.ai Chrome extension. You always review the form and press Submit yourself.