About the job
Toloka AI offers project-based freelance roles for experienced Data Science Engineers. This position supports leading technology companies by designing and validating data science challenges that reflect real-world analytics scenarios. The engagement is freelance, not permanent employment.
Role overview
Freelance Data Science Engineers at Toloka AI create computational challenges for industries such as telecom, finance, government, e-commerce, and healthcare. Projects require designing problems that use Python and SQL, focusing on tasks that cannot be solved manually. Each challenge covers the full data science workflow, from data ingestion and cleaning to modeling and deployment considerations.
Engineers use libraries such as Pandas, NumPy, SciPy, Scikit-learn, Statsmodels, Matplotlib, and Seaborn. Problems must be deterministic, reproducible, and based on realistic business scenarios like customer analytics, risk assessment, fraud detection, forecasting, and operational efficiency. Documentation of each challenge includes business context and a verified solution. Big data processing and scalable computational approaches are often required.
Requirements
- At least 5 years of hands-on data science experience with measurable business outcomes
- Portfolio of completed projects or publications showing real-world problem-solving
- Advanced Python skills for data science, including pandas, numpy, scipy, scikit-learn, and statsmodels
- Strong background in statistical analysis and machine learning algorithms
- Proficiency in SQL and database operations for data analysis
- Familiarity with Generative AI tools and concepts (LLMs, RAG, prompt engineering, vector databases)
- Understanding of MLOps practices and model deployment workflows
- Knowledge of frameworks such as TensorFlow, PyTorch, or LangChain
- Excellent written English skills at C1 level or higher
How to apply
- Submit your CV in English and specify your English proficiency level
- Complete the qualification process
- Join a project after qualification
- Carry out assigned tasks
- Receive payment upon completion of work
Location: Remote , Wisconsin, United States

