Corporate/M&A Legal AI Reviewer

About OpenTrain

OpenTrain is the #1 platform for finding and building careers in AI training and data labeling. OpenTrain AI hires and contracts contributors for specialized projects where human expertise helps shape how advanced AI systems work.

About Legal AI Training

AI training is the human side of building artificial intelligence. Expert reviewers assess model-generated answers, identify errors, and provide structured feedback so AI systems can become more accurate, useful, and reliable in specialized fields such as law.

The Role

OpenTrain is seeking an experienced corporate and M&A lawyer to review AI-generated legal content. You will compare answers from two AI platforms, score each response against a standardized rubric, and provide concise written feedback.

This is a remote contract, part-time opportunity open to candidates in Spain. The initial commitment is approximately 10 hours, with strong potential for additional work. The listing also indicates a time requirement of 20+ hours per week.

• Location: Spain
• Work arrangement: Remote
• Engagement: Contractor and part-time
• Pay: $140–$150 per hour, depending on experience and assignment

What You'll Do

You will evaluate legal responses consistently and independently, following the provided rubric and meeting project deadlines.

• Run the same legal prompts across two AI platforms
• Compare AI-generated outputs side by side
• Score every response against a standardized rubric
• Submit concise written feedback for each evaluation
• Assess content using your knowledge of Spanish corporate and commercial law

Requirements

This project requires professional legal experience in corporate, M&A, or transactional practice, along with the ability to communicate precise evaluations in Spanish.

• Qualified to practice law in Spain
• At least 2 years of law-firm experience in corporate/M&A or transactional practice; 3+ years preferred
• Strong command of Spanish corporate and commercial law
• Native or fluent Spanish with precise written communication
• Ability to work independently, follow a standardized rubric, and meet deadlines
• Experience comparing or evaluating AI-generated legal content is beneficial

Why Work in AI Training

AI training and data annotation are rapidly growing areas of tech work. Contributors with specialized knowledge directly influence how modern AI systems respond to real-world legal questions, while remote and flexible project structures can complement an existing professional practice.

• Work remotely from Spain
• Apply specialized legal expertise to cutting-edge AI systems
• Choose project work that can fit alongside other commitments
• Build experience in the growing field of AI evaluation

How the Project Works

After joining the project, you will receive the legal prompts, AI outputs, and standardized evaluation rubric needed for the assignment. Your role is to review each response carefully, assign a score, and explain your assessment in concise written feedback.

• Review the assigned prompt set
• Evaluate and compare the generated answers
• Apply the rubric consistently
• Submit completed evaluations by the required deadlines