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Data Services

Expert Annotation at Scale: Lessons from 10 Million Labels

DMT

Dr. Minh Tran

Head of AI Research · February 15, 2025

Expert Annotation at Scale: Lessons from 10 Million Labels

Scaling expert annotation without sacrificing quality is the central challenge of AI data services. At SyncSoftAI, we've processed over 10 million labels across text, image, video, and 3D modalities, and in this post we share the lessons that shaped our approach.

The first lesson is that annotator selection matters more than tooling. PhD-level domain experts consistently produce labels that lead to better model performance. We invest heavily in recruiting, training, and retaining specialists across medicine, law, engineering, and more.

Quality assurance must be built into the pipeline, not bolted on. Our four-layer QA system — automated validation, statistical monitoring, peer review, and expert audit — catches errors at every stage and prevents drift before it impacts downstream model training.

Finally, multi-modal consistency is critical. When a project spans text and image annotation, the same quality standards and domain expertise must apply across modalities. Our unified platform ensures consistent output regardless of data type.

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