Ship Safer AI, Faster

Folio provides an end-to-end healthcare data engine, working with vetted clinical experts to help AI labs reduce hallucinations, accelerate evaluation cycles, and ship safer healthcare models.

30k+

Vetted Professionals

500+

Universities Represented

$1M+

Expert Earnings Paid

Powered by professionals, experts and graduate students from top institutions
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Testimonial Section

Quality at Scale

Unmatched Vertical Depth

A community who understands nuanced medical judgment, not just annotation instructions.

Built for Regulated Markets

BAA-ready infrastructure, PHI de-identification protocols, and role-based access controls designed for compliance.

Best-in-Class Expert Training

Every expert is assessed on our proprietary core AI curriculum, in addition to custom training developed for your project, ensuring you work only with the top of the class.

Services

RLHF
Generate preference pairs that reflect real clinical reasoning. Our experts evaluate response quality based on clinical accuracy, safety, and adherence to standard of care in real care settings—not just fluency.

Typical outputs: Ranked response pairs, detailed preference rationales, clinical accuracy scores, identification of hallucinated clinical facts
Rubrics & Verifiers
Transform complex clinical protocols into structured evaluation criteria your models can learn from. We convert unstructured clinical knowledge into measurable verification tasks.

Typical outputs: Structured rubrics, verification test sets, inter-rater agreement baselines, edge case documentation
Safety & Red‑Teaming
Models fail in surprisingly human ways: a triage suggestion that downplays red‑flag symptoms, or a draft note that quietly invents an allergy. We work with med students, nurses, residents, and other clinicians‑in‑training to probe for these failure modes, map them into patterns, and give your teams concrete targets for hardening guardrails before they touch patients or staff.

Typical outputs: Categorized safety failures, severity scoring, reproduction steps, mitigation recommendations, adversarial test sets
Multimodal
Modern clinical data spans formats: progress notes reference imaging findings, waveforms explain treatment changes, pathology images inform diagnoses. We annotate text, images, audio, and signals together—the way clinicians actually integrate information.

Typical outputs: Cross-modal annotations, linked reasoning chains, multimodal quality scores, format-specific error analysis

Integrate with Your Development Workflow

Define

Initial analysis of your model's gaps and challenges. Mutually define success metrics and  evaluation priorities.

Deploy

Dedicated clinical team  calibrates on sample tasks. Establish quality baselines and deliver initial annotations with full quality metrics to validate approach before committing to scale.

Scale

Once validated, ramp to full production volume with continuous quality monitoring. Dual review on statistically significant samples, weekly calibration sessions, and real-time dashboards to ensure consistency.

QA

Regular feedback loops capture edge cases and evolving safety concerns. We track inter-rater agreement trends, maintain error taxonomies, and help you measure annotation impact on model performance.

Case Studies

Oncology Clinical Trial Eligibility

Challenge
Transform complex multi-cancer clinical trial protocols into consistent, structured eligibility criteria that a verifier model could evaluate.

Solution
Scaled a team of M1-M4 medical students trained on a standardized workflow to interpret oncology datasets and handle response discordance through consensus review.

Outcomes
• 94% inter-rater agreement across 6 cancer types
• Standardized data format enabled single survey template
• 72-hour turnaround with zero-cost expert replacement
• Model accuracy improved from 67% to 91% on eligibility determination

PHI Classification at Scale

Challenge
Train a PHI detection model using thousands of real clinical documents, requiring fast, compliant annotation from reviewers who understand clinical context and terminology.

Solution
Built a 300-person team of US-based medical students using a secure iOS workflow. Reviewers highlighted and tagged all PHI entities in clinical notes and transcripts with entity-level classification and clinical context preservation.

Outcomes
• 98% PHI detection recall with clinically-aware annotators who caught context-dependent identifiers
• 3x faster throughput via mobile-first workflow enabling flexible scheduling
• Zero compliance incidents with US-based, HIPAA-trained workforce and BAA-compliant infrastructure
• <48 hour backfill for dropped annotators maintained consistent delivery

Adversarial Reasoning Benchmark for LLM Evaluation

Challenge
Create a durable reasoning benchmark that exposes failure modes in frontier models without becoming obsolete after one training cycle—requiring prompts that are human-solvable but consistently difficult for LLMs.

Solution
Developed adversarial evaluation methodology using backward-engineered prompts from stable facts across academic, historical, and legal domains. Each prompt required 3/3 failure rate across leading models, verified ground-truth answers with citations, and detailed scoring rubrics before dataset inclusion.

Outcomes
• 100% prompt durability - all questions remained challenging across 4+ model generations
• 85%+ human solve rate vs. <33% initial model accuracy, validating adversarial effectiveness
• Production-ready evaluation suite with answer keys, rubrics, and automated verification infrastructure
• Enabled systematic tracking of reasoning improvement across model releases

Join AI Labs Building Safer Healthcare Models

Foundation model teams, healthcare product companies, and pharma AI divisions trust Folio to validate their clinical AI.