Frontier Alignment

Subject Matter Expert RLHF

Domain-expert RLHF at scale. Appen sources, vets, and deploys specialist annotators for human feedback across STEM, law, medicine, and finance.

Standard crowdsourced feedback cannot evaluate whether a clinical diagnosis is sound, a legal argument is correct, or a financial model is valid. RLHF AI at frontier quality requires contributors who have the domain expertise to distinguish genuinely better responses from merely more confident ones.

Appen provides verified subject matter experts across medicine, law, science, finance, and engineering for the preference ranking, comparative evaluation, and nuanced feedback collection that trains the reward models powering your most capable systems.

What Appen Delivers

Verified Domain Expert Contributors

PhDs, MDs, JDs, and certified professionals recruited, verified, and onboarded for domain-specific RLHF tasks. Appen's expert sourcing process goes beyond credential checking to domain assessment, ensuring contributors can actually evaluate the outputs they are reviewing, not just confirm they hold the relevant qualification.

Preference Ranking and Comparative Feedback

Side-by-side response comparison with structured justification, capturing not just which response is preferred but why. Detailed preference rationales provide richer reward signal than binary comparisons alone, and enable rubric refinement as your model improves.

Multi-Turn Conversation Evaluation

Expert review of complete multi-turn dialogue sequences, assessing coherence, accuracy, and appropriate domain depth across the full conversation context. Critical for training models that maintain professional quality across extended expert interactions, not just single-turn responses.

Why Subject Matter Experts

As frontier models approach and exceed average human performance on general benchmarks, the remaining quality ceiling is set by expert performance. Fine-tuning LLMs on domain expert feedback is what separates general models from trusted professional tools.

Appen has delivered expert RLHF programmes for leading AI companies including Cohere's preference-based fine-tuning for enterprise LLMs. Our expert contributor network spans 50 specialist domains and is continuously recruited to match the evolving requirements of frontier model development.