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Freelance Data Scientist (Python & SQL) - AI Training Specialist

toloka-aiRemote — Wisconsin, United States
Remote Contract $90/hr - $90/hr

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Experience Level

Mid to Senior

About the job

Please submit your CV in English and indicate your English proficiency level.

This freelance, project-based contract connects experienced data scientists with AI training assignments for major technology clients. Projects focus on testing, evaluating, and improving AI systems. This is not a permanent employment position.

Role overview

The AI Training Specialist will design advanced computational data science challenges that mirror real-world analytical workflows. Scenarios span industries such as telecom, finance, government, e-commerce, and healthcare. Each challenge should require deep analytical thinking and practical coding skills.

What you will do

  • Create data science problems that require Python programming with libraries like Pandas, Numpy, Scipy, Sklearn, Statsmodels, Matplotlib, and Seaborn.
  • Develop computationally intensive tasks that cannot be solved manually in a few days or weeks.
  • Formulate challenges involving complex data processing, statistical analysis, feature engineering, predictive modeling, and generating insights.
  • Ensure all problems are deterministic, with replicable solutions and fixed random seeds.
  • Base scenarios on business needs such as customer analytics, risk assessment, fraud detection, forecasting, optimization, and operational efficiency.
  • Cover the full data science pipeline, from data ingestion to deployment considerations.
  • Include tasks that require scalable computational approaches and big data processing.
  • Validate solutions using standard Python data science libraries and statistical methods.
  • Document each problem clearly, providing realistic business context and verified answers.

Requirements

  • Minimum 5 years of hands-on data science experience with measurable business results.
  • Portfolio of projects or publications demonstrating real-world problem-solving.
  • Advanced Python skills for data science (pandas, numpy, scipy, scikit-learn, statsmodels).
  • Strong background in statistical analysis and machine learning, including practical applications and algorithms.
  • Expertise in SQL and database management for data manipulation and analysis.
  • Familiarity with Generative AI tools and concepts (LLMs, RAG, prompt engineering, vector databases).
  • Understanding of MLOps and model deployment workflows.
  • Experience with frameworks such as TensorFlow, PyTorch, and LangChain.
  • Excellent written English at C1 level or above.

Application process

  1. Apply
  2. Pass qualification(s)
  3. Join a project
  4. Complete tasks
  5. Receive payment

This contract is remote and open to candidates based in Wisconsin, United States.

About toloka-ai

toloka-ai is dedicated to bridging the gap between skilled professionals and leading tech companies seeking expertise in AI system testing, evaluation, and enhancement. Our project-based approach ensures flexibility and engagement with innovative AI challenges.

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