Meridial Marketplace (by Invisible) seeks Korean language specialists to contribute high-quality multimodal training data for advancing AI language models. Contributors converse with AI models on Korean-specific linguistic scenarios, verify factual accuracy and logical soundness of responses, document reproducible error traces, and suggest improvements to prompt engineering and evaluation metrics, covering honorifics, sentence structure, verb conjugation, word order, regional dialects, idiomatic expressions and script variations. Requires deep expertise in Korean grammar, syntax, morphology, phonetics, semantics and pragmatics; a Bachelor's in Korean language or linguistics is ideal. The role involves providing audio, video, image and written content and requires applicants to be 18+. Remote worldwide contract paying $6–$65/hour by experience and location; no company benefits.