Frontier AI Safety Evaluator & Model Alignment Expert

Mercor; Greater London; On-site; GBP 70,000 - 110,000; Full time

Job summary

Obsidian is seeking experienced AI Safety Practitioners to evaluate frontier AI models across complex, policy-sensitive, and ambiguous thoughts. You will assess AI-generated responses, apply safety policies, and help improve model behavior through structured evaluations and feedback.

Responsibilities include evaluating safety, factual accuracy, and policy compliance; reviewing content on misinformation, political persuasion, self-harm, violence, cyber, and biosecurity; applying evaluation

Qualifications

• Bachelor's degree or higher in journalism, communications, psychology, sociology, public policy, law, biology, chemistry, computer science, or a related discipline.
• 5+ years of professional experience in AI Safety, Trust & Safety, journalism, public policy, scientific research, security, or a related field.
• Excellent written English, critical thinking, and analytical reasoning skills.
• Ability to consistently evaluate nuanced and policy-sensitive scenarios.

Responsibilities

• Evaluate AI-generated responses for safety, factual accuracy, policy compliance, and overall quality.
• Review content involving misinformation, political persuasion, self-harm, violence, cyber, biosecurity, and other sensitive domains.
• Apply and refine evaluation rubrics for RLHF, SFT, and AI safety benchmarking.
• Identify unsafe outputs, hallucinations, reasoning failures, and policy violations.
• Provide structured feedback to improve model alignment and safety performance.
• Collaborate with AI researchers and safety teams on ongoing evaluation initiatives.

Skills

Critical thinking

Analytical reasoning

Excellent written English

Education

Bachelor's degree or higher

Job description

Obsidian is seeking experienced AI Safety Practitioners to evaluate frontier AI models across complex, policy-sensitive, and ambiguous thoughts. You will assess AI-generated responses, apply safety policies, and help improve model behavior through structured evaluations and feedback.

Responsibilities include evaluating safety, factual accuracy, and policy compliance; reviewing content on misinformation, political persuasion, self-harm, violence, cyber, and biosecurity; applying evaluation