Improving Occupational ISCO Classification of Multilingual Swiss Job Postings with LLM-Refined Training Data

Classifying occupations in multilingual job postings is challenging due to noisy labels, language variation, and domain-specific terminology.We present a method that refines silverstandard ISCO labels by consolidating them with predictions from pre-fine-tuned models, using large language model (LLM) evaluations to resolve discrepancies.The refined labels are used in Multiple Negatives Ranking (MNR) training for SentenceBERT-based classification.This approach substantially improves performance, raising Top-1 accuracy on silver data from 37.2% to 58.3% and reaching up to 80% precision on held-out data-an over 30-point gain validated by both GPT and human raters.The model benefits from cross-lingual transfer, with particularly strong gains in French and Italian.These results demonstrate hat LLMguided label refinement can substantially improve multilingual occupation classification in fine-grained taxonomies such as CH-ISCO with 670 classes.