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A Scalable Pipeline for Novelty Detection in Skill Extraction Using Large Language Models

The rapid evolution of the labor market requires skill ontologies to be continuously updated, but manually identifying emerging skills in job advertisements is highly labor-intensive. This paper presents a scalable, multi-stage pipeline for automated novelty detection in skill extraction. The system combines Large Language Models (LLMs) for candidate generation, a re-matching and threshold-based filtering module ("Turbo"), that compares candidates against the existing ontology, and a two-step aggregation process that merges string-based and embedding-based clustering. Experiments on Swiss job advertisement datasets using GPT-4o, Gemini-2.0-flash, and DeepSeek-V3 show that the pipeline effectively reduces noise and manual curation effort: Turbo filtering lowered false positives by 82%, and aggregation reduced the number of items requiring review by 97%. Among the tested models, Gemini-2.0-flash achieved the highest precision, reaching a novelty detection ratio of up to 73% in the qualitative evaluation. These findings demonstrate the pipeline’s potential as an efficient tool for maintaining dynamic skill ontologies.