OpenTrain AI is hiring a Catalan AI Response Evaluation Expert based in Spain to review and improve AI-generated outputs for accuracy, reasoning, clarity, and linguistic quality. Candidates must possess native or near-native C2 written Catalan and at least C1 English proficiency to document decisions and escalate notes. The role is a part-time remote contractor position requiring 20+ hours per week, suited for candidates with a background in Catalan editing, translation, localization, or linguistic QA.