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

toloka-aiRemote — Lyon, Auvergne-Rhône-Alpes, France
Remote Contract $58/hr - $58/hr

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Experience Level

Experience

Qualifications

To thrive in this role, candidates should meet the following qualifications:Minimum of 5 years of relevant data science experience. Demonstrated ability to create impactful data science solutions. Expertise in Python and SQL. Strong statistical analysis and machine learning background. Familiarity with Generative AI technologies. Proficient in modern data science frameworks. Excellent English communication skills (C1+).

About the job

Please submit your CV in English and describe your English language proficiency.

toloka-ai, working with Mindrift, connects experienced professionals to project-based AI work for leading technology companies. This freelance contract centers on evaluating and refining AI systems. The position is not permanent and assignments are project-based.

Project Scope

Each assignment brings a new data science challenge. Typical responsibilities include:

  • Designing original data science problems that reflect real analytical workflows in sectors such as telecom, finance, government, e-commerce, and healthcare.
  • Building problems that require Python solutions, using libraries like Pandas, Numpy, Scipy, Scikit-learn, Statsmodels, Matplotlib, and Seaborn.
  • Ensuring tasks are computationally intensive and cannot be solved by hand in a short time.
  • Developing complex scenarios involving data processing, statistical analysis, feature engineering, predictive modeling, and drawing insights.
  • Creating deterministic problems with reproducible outcomes, either by avoiding randomness or setting fixed seeds.
  • Basing problems on real business needs, such as customer analytics, risk assessment, fraud detection, forecasting, optimization, and operational efficiency.
  • Covering the entire data science workflow: data ingestion, cleaning, exploratory analysis, modeling, validation, and deployment considerations.
  • Including big data processing that requires scalable approaches.
  • Validating solutions with Python and standard data science tools and statistical methods.
  • Documenting each problem clearly, providing realistic business context and verified solutions.

Requirements

  • At least 5 years of hands-on data science experience with measurable business results.
  • A portfolio of completed projects or publications showing real-world problem solving.
  • Expertise in Python for data science (including pandas, numpy, scipy, scikit-learn, statsmodels).
  • Deep understanding of statistical analysis and machine learning, including practical algorithms and applications.
  • Advanced SQL skills and experience with database operations for analysis and data manipulation.
  • Background in Generative AI technologies (such as LLMs, RAG, prompt engineering, vector databases).
  • Understanding of MLOps and model deployment practices.
  • Familiarity with frameworks like TensorFlow, PyTorch, or LangChain.
  • Strong written English skills at C1 level or above.

Application Process

  1. Apply
  2. Complete qualifications
  3. Join a project
  4. Perform tasks
  5. Receive payment

This freelance data scientist role is remote, based in Lyon, Auvergne-Rhône-Alpes, France.

About toloka-ai

toloka-ai is at the forefront of connecting data science specialists with innovative AI projects, enabling professionals to contribute to transformative technology solutions for leading companies worldwide.

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