Spanish–English Localization & LQA Specialist (Spain)

About OpenTrain

OpenTrain is the #1 platform for building careers in AI training and data labeling. We connect language professionals with real-world projects that shape how advanced AI systems understand and produce language. Creating an OpenTrain account is free.

About AI training and localization work

AI training (also called data labeling or human evaluation) is the human side of making AI behave reliably. Localization and linguistic quality assurance help models produce accurate, culturally appropriate, and defensible Spanish (Spain) outputs.

This role sits at the intersection of localization and model evaluation: you will judge, correct, and defend linguistic choices so that AI systems learn to generate higher-quality Spanish for the Spain locale.

The role

You will review AI-generated Spanish and English content, evaluate accuracy and clarity, correct outputs, provide model answers and explanations, and rate/rank multiple model responses using structured evaluation criteria.

Work is contractor, part-time (less than 20 hours/week), remote but must be based in Spain. Compensation is hourly at USD $24/hour. The data type is text and the labeling work includes evaluation ratings, RLHF-style ranking, and translation/localization tasks.

What you'll do

• Evaluate AI outputs for accuracy, clarity, reasoning quality, adherence to prompts and project guidelines.
• Identify linguistic issues and methodological problems; classify errors by severity and category using MQM/LQA frameworks.
• Write high-quality corrected outputs and model answers with clear explanations or justification for edits.
• Rate and rank multiple AI responses using structured rubrics and provide defensible, consistent decisions.
• Fact-check localized details (units, names, dates, references) using reliable sources and sound reasoning.
• Apply terminology management and style guides to ensure consistent tone, register, and cultural appropriateness.

Requirements

• Must be currently based in Spain (location requirement).
• Native or near-native Spanish proficiency for the Spain locale with professional writing/editing skills.
• English proficiency at C1+ (reading and writing) to interpret prompts, sources, and evaluation guidelines.
• Bachelor’s degree or higher in Translation, Linguistics, Localization, Communications, or related field.
• Minimum 5 years professional localization/translation experience (multilingual localization preferred).
• Demonstrated experience applying MQM or LQA error typologies, with consistent severity/category decisions and root-cause thinking.
• Proficiency with CAT tools and QA workflows, including TM/termbases and automated checks.
• Strong terminology management and copyediting ability, including tone, register, inclusivity, and cultural nuance.
• Ability to rigorously fact-check localized content using reliable references.

Preferred qualifications

• Prior experience with AI data training, annotation, or evaluation projects is preferred.

How it works — schedule, pay, and applying

This is a contractor position with flexible part-time hours (under 20 hours/week). You will be paid USD $24 per hour. Tasks are remote but you must be based in Spain.

To apply, create your OpenTrain profile (free), confirm your location and language credentials, and submit your CV and examples of localization or LQA work when prompted. Short practical tests and rubric-based evaluations are commonly used to verify fit.