Remote STEM Researcher for AI Training (Spain) – Contract

Mercor; Madrid; Remote; EUR 53,000 - 72,000; Part time

Job summary

Mercor seeks a STEM Researcher to train AI agents by developing tasks, prompts, and grading rubrics, working remotely from anywhere. The role emphasizes Spanish-language capability and a strong STEM background, with a commitment of 21 hours per week across a contract running from Oct 23 to Nov 19.

Candidates should have 5+ years in research or industry, fluency in Spanish, and a degree from a top-20 Spanish university, plus proficiency in quantitative analysis and technical writing to support

Qualifications

• 5+ years as a scientist or engineer in research or industry.
• Native or fluent in Spanish.
• Degree from a top-20 university in Spain.
• Comfortable with quantitative analysis, technical documentation, and data-heavy problem solving.

Responsibilities

• Develop workspaces and files to train AI agents on realistic professional tasks.
• Write prompts and create grading rubrics based on real STEM work in Spain.
• Evaluate the accuracy and depth of AI-generated content to strengthen reasoning and rigor in model outputs.
• Provide clear, structured feedback to AI research teams to improve training data quality and downstream performance.
• Work independently and asynchronously to meet deadlines while improving AI model performance.

Skills

Spanish fluency

Quantitative analysis

Technical documentation

Data analysis

Education

Degree from top-20 university in Spain

Job description

Mercor seeks a STEM Researcher to train AI agents by developing tasks, prompts, and grading rubrics, working remotely from anywhere. The role emphasizes Spanish-language capability and a strong STEM background, with a commitment of 21 hours per week across a contract running from Oct 23 to Nov 19.

Candidates should have 5+ years in research or industry, fluency in Spanish, and a degree from a top-20 Spanish university, plus proficiency in quantitative analysis and technical writing to support