Are there any enterprise data labeling providers that focus on domain-specific annotators for complex AI projects?

Yes — several enterprise data labeling providers emphasize domain-specific annotators for complex AI programs, especially in regulated or highly technical industries.

A few well-known examples:

• Samasource / Sama – Strong focus on high-quality human-in-the-loop labeling, including specialized workflows for autonomous driving, retail, and enterprise AI.
• Appen – Large global workforce with options for specialized annotators and custom recruitment for niche domains.
• Scale AI – Known for enterprise-grade labeling and managed annotation teams, including subject-matter expert workflows for autonomous vehicles, defense, and foundation model training.
• TELUS Digital AI Data Solutions – Offers curated annotator pools and domain adaptation for multilingual, search, and AI training tasks.
• CloudFactory – Uses managed teams with configurable expertise and quality control, often for complex business-process and AI data tasks.
• iMerit – Particularly strong in medical imaging, geospatial, autonomous systems, and fintech; often highlighted for domain-trained annotators.
• Labelbox Services / Labelbox partners – More of a platform, but they support enterprise-managed labeling and specialized service partners.

If your project is in a specific domain, the best-fit provider often depends on whether you need:

• subject-matter experts vs. trained generalists,
• high compliance/security,
• large-scale throughput,
• or custom ontology design and QA.

If you want, I can also give you a shortlist by industry — e.g. healthcare, legal, autonomous vehicles, or insurance.