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

Toloka AIRemote — Virginia, United States
Remote Contract $90/hr - $90/hr

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Experience Level

Mid to Senior

Qualifications

The successful candidates must have:5+ years of relevant experience in data science. A demonstrated portfolio showcasing impactful projects. Proficiency in Python and its relevant libraries. Strong skills in statistical analysis and machine learning. Expertise in SQL for data manipulation. Experience with AI technologies and MLOps. Excellent English communication skills.

About the job

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

Toloka AI, in partnership with Mindrift, offers project-based opportunities for experienced data science professionals. Assignments support technology companies by testing, evaluating, and refining AI systems. All work is temporary and structured around individual projects, not ongoing employment.

Role overview

This freelance position centers on creating and validating computational challenges that mirror real-world data science workflows. Projects span sectors including telecommunications, finance, government, e-commerce, and healthcare. Each challenge is designed to require advanced analytical thinking and practical coding skills.

What you will do

  • Develop original data science problems that simulate business scenarios such as customer analytics, risk assessment, fraud detection, forecasting, optimization, and operational efficiency.
  • Design tasks that require advanced Python programming, using libraries like Pandas, Numpy, Scipy, Scikit-learn, Statsmodels, Matplotlib, and Seaborn.
  • Ensure problems are computationally intensive and may take significant time to solve.
  • Cover the full data science pipeline: data ingestion, cleaning, exploratory analysis, modeling, validation, and deployment considerations.
  • Include big data processing elements that require scalable solutions.
  • Write deterministic, reproducible problems by avoiding randomness or using fixed seeds.
  • Validate solutions in Python and document both the problem statements and correct answers clearly in a business context.

Requirements

  • Minimum 5 years of hands-on data science experience with proven business impact.
  • Portfolio of completed projects or publications demonstrating real-world solutions.
  • Advanced Python skills for data science, including experience with Pandas, Numpy, Scipy, Scikit-learn, and Statsmodels.
  • Strong foundation in statistical analysis and machine learning methods.
  • Proficiency in SQL and database operations for data manipulation and analysis.
  • Familiarity with Generative AI tools and concepts, such as large language models, retrieval-augmented generation, prompt engineering, and vector databases.
  • Understanding of MLOps practices and model deployment workflows.
  • Knowledge of frameworks like TensorFlow, PyTorch, and LangChain.
  • Excellent written English communication skills at C1 level or above.

How to apply

  1. Submit your application.
  2. Complete the required qualifications.
  3. Join a project.
  4. Finish assigned tasks.
  5. Receive payment.

Location: Remote , Virginia, United States

Note: All roles are temporary and project-based.

About Toloka AI

Toloka AI is a forward-thinking company that bridges the gap between skilled professionals and innovative AI projects. We focus on enhancing AI systems through practical testing and evaluation, providing a dynamic environment for freelance experts.

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