Senior Data Scientist: Experiment Design & AI Evaluation

mercor; San Francisco (CA); Hybrid; GBP 125,000 - 177,000; Full time

Job summary

Mercor is seeking a Data Science Expert on a contract basis to remotely support AI research labs. You will design grading criteria, score samples, and deliver clear justifications to stakeholders. The role requires 5+ years in data science, strong experiment design, SQL/Python, and exceptional written communication.

You will work asynchronously to meet deadlines and help improve AI models. Remote position with flexible hours and collaboration with cross-functional teams; prior AI training or

Qualifications

• 5+ years of professional data science experience in industry.
• Background in business operations, product, or growth data science at top-tier technology companies.
• Deep fluency in experiment design and A/B testing, metric definition, SQL/Python analysis, and communicating findings to executive stakeholders.
• Exceptionally strong written communication.
• Detail-oriented, consistent, and comfortable having your judgment reviewed and calibrated against peers.

Responsibilities

• Design precise, task-specific grading criteria for real-world data science deliverables such as analyses, models, dashboards, and experiment readouts.
• Score AI-generated and human work samples against criteria with detailed written justifications for every score.
• Apply consistent, evidence-based judgment to ensure scores are reproducible and defensible.
• Incorporate structured feedback from senior reviewers and iterate quickly on your work.
• Work independently and asynchronously to meet deadlines while improving AI model performance.

Skills

Data science experience 5+ years

Business/Product data science

Experiment design & A/B testing

SQL

Python

Tools

SQL

Python

Job description

Mercor is seeking a Data Science Expert on a contract basis to remotely support AI research labs. You will design grading criteria, score samples, and deliver clear justifications to stakeholders. The role requires 5+ years in data science, strong experiment design, SQL/Python, and exceptional written communication.

You will work asynchronously to meet deadlines and help improve AI models. Remote position with flexible hours and collaboration with cross-functional teams; prior AI training or