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Freelance Data Scientist (Python & SQL) - AI Trainer

Mindrift

Contract|$90/hr - $90/hr|Remote|Remote — Iowa, United States

Please submit your CV in English and mention your English proficiency level. Mindrift connects experienced professionals with project-based AI assignments for technology companies. The platform focuses on testing, evaluating, and improving AI systems. This is a project-based, non-permanent position. Role overview The Freelance Data Scientist (Python & SQL) -…

Apr 25, 2026

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

toloka-ai

Contract|$90/hr - $90/hr|Remote|Remote — Iowa, United States

Please submit your CV in English and indicate your level of English proficiency.At Mindrift, we connect talented specialists with innovative, project-based AI opportunities from leading technology companies. Our focus is on testing, evaluating, and enhancing AI systems. Note that participation is project-based and does not constitute permanent employment.Key Responsibilities:Develop original computational data science challenges that reflect real-world analytical tasks across various sectors, including telecom, finance, government, e-commerce, and healthcare.Design problems that necessitate Python programming for solutions using libraries such as Pandas, Numpy, Scipy, Sklearn, Statsmodels, Matplotlib, and Seaborn.Create complex, computationally intensive problems that are impractical to solve manually within a reasonable timeframe.Formulate problems that require intricate reasoning in data processing, statistical analysis, feature engineering, predictive modeling, and extracting insights.Ensure problems yield deterministic results with reproducible answers, avoiding stochastic elements unless fixed random seeds are utilized.Base scenarios on genuine business challenges like customer analytics, risk assessment, fraud detection, forecasting, optimization, and operational efficiency.Design comprehensive problems that encompass the entire data science pipeline, from data ingestion and cleaning through exploratory data analysis (EDA), modeling, validation, and deployment considerations.Integrate big data processing scenarios that demand scalable computational methods.Verify solutions using Python and standard data science libraries alongside statistical techniques.Clearly document problem statements within realistic business contexts, providing verified correct answers.Qualifications:We seek Data Science specialists with expertise in Python who are open to part-time, non-permanent projects. Ideal candidates should possess:A minimum of 5 years of practical experience in data science with demonstrable business impact.A portfolio showcasing completed projects and publications that highlight real-world problem-solving abilities.Expertise in Python programming for data science, including proficiency in Pandas, Numpy, Scipy, Scikit-learn, and Statsmodels.Advanced statistical analysis and machine learning skills, with a deep understanding of algorithms, methods, and their practical applications.Proficient in SQL and database operations for effective data manipulation and analysis.Familiarity with Generative AI technologies, such as LLMs, RAG, prompt engineering, and vector databases.An understanding of MLOps practices and model deployment workflows.Knowledge of contemporary frameworks, including TensorFlow and PyTorch.Strong written English skills (C1 or higher).Application Process:Apply → Pass qualifications → Join a project → Complete tasks → Get compensated.

May 4, 2026

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Freelance Data Scientist (Python & SQL) - AI Solutions Expert

Toloka AI

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

We kindly request candidates to submit their CV in English along with their English proficiency level.At Toloka AI, we bridge the gap between skilled professionals and exciting project-based AI opportunities for top technology companies. Our focus is on the testing, evaluation, and enhancement of AI systems. This role is project-based and does not constitute permanent employment.What This Role EntailsEach project presents unique challenges, and contributors may be tasked with:Crafting original computational data science scenarios that emulate real-world analytical processes across diverse sectors, including telecom, finance, government, e-commerce, and healthcare.Designing problems that necessitate Python programming for resolution (utilizing libraries such as Pandas, NumPy, SciPy, Scikit-learn, Statsmodels, Matplotlib, and Seaborn).Ensuring that problems require significant computational resources, making manual solutions impractical within a reasonable timeframe (days or weeks).Engineering challenges that involve complex reasoning chains in data processing, statistical analysis, feature engineering, predictive modeling, and insights extraction.Creating deterministic problems with reproducible outcomes, avoiding stochastic elements unless fixed random seeds are employed for precise replication.Focusing on authentic business challenges, such as customer analytics, risk assessment, fraud detection, forecasting, optimization, and operational efficiency.Designing comprehensive end-to-end problems that encompass the entire data science pipeline (data ingestion → cleaning → exploratory data analysis → modeling → validation → deployment considerations).Incorporating big data scenarios that require scalable computational techniques.Validating solutions using Python alongside standard data science libraries and statistical methodologies.Clearly documenting problem statements with realistic business contexts and providing verified correct solutions.What We Are Looking ForThis opportunity is ideal for Data Science professionals with extensive Python experience seeking part-time, non-permanent projects. Preferred qualifications include:5+ years of practical experience in data science with demonstrable business outcomes.A portfolio showcasing completed projects and publications that highlight real-world problem-solving capabilities.Advanced Python programming skills for data science (Pandas, NumPy, SciPy, Scikit-learn, Statsmodels).Deep expertise in statistical analysis and machine learning, with a thorough understanding of algorithms, methods, and their practical applications.Proficiency in SQL and database operations for data manipulation and analysis.Experience with generative AI technologies (LLMs, RAG, prompt engineering, vector databases).Familiarity with MLOps practices and model deployment workflows.Knowledge of contemporary frameworks (TensorFlow, PyTorch, LangChain).Strong written English proficiency (C1+).Application ProcessApply → Pass qualifications → Join a project → Complete tasks → Receive payment

May 4, 2026

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

Mindrift

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

We kindly request that you submit your CV in English along with your indicated level of English proficiency.Mindrift connects talented specialists with exciting project-based AI opportunities in collaboration with leading technology firms, focusing on the testing, evaluation, and enhancement of AI systems. Please note that participation is project-based and does not entail permanent employment.What this opportunity entails:Designing innovative computational data science challenges that mimic real-world analytical workflows across various sectors, including telecommunications, finance, government, e-commerce, and healthcare.Creating problem sets that necessitate Python programming skills for resolution, employing libraries such as Pandas, Numpy, Scipy, Sklearn, Statsmodels, Matplotlib, and Seaborn.Ensuring that the problems presented are computationally demanding and cannot be addressed manually within reasonable timeframes (days to weeks).Developing tasks that require complex reasoning sequences in areas like data processing, statistical analysis, feature engineering, predictive modeling, and insight extraction.Formulating deterministic challenges that yield reproducible results, avoiding stochastic components or requiring fixed random seeds for precise replication.Grounding problems in authentic business circumstances, such as customer analytics, risk assessment, fraud detection, forecasting, optimization, and operational efficiency.Crafting end-to-end problems that encompass the entire data science pipeline (data ingestion → cleaning → exploratory data analysis → modeling → validation → deployment considerations).Incorporating scenarios that involve big data processing, requiring scalable computational strategies.Verifying solutions with Python, utilizing standard data science libraries and statistical techniques.Clearly documenting problem statements with credible business contexts and delivering verified correct answers.Ideal Candidate Profile:This opportunity is tailored for data science professionals with extensive experience in Python who are open to part-time, non-permanent projects. We are particularly looking for contributors who possess:A minimum of 5 years of hands-on data science experience with demonstrated business impact.A portfolio showcasing completed projects and publications that highlight real-world problem-solving skills.Proficient Python programming capabilities for data science (including pandas, numpy, scipy, scikit-learn, statsmodels).A strong foundation in statistical analysis and machine learning, with an in-depth understanding of algorithms, methods, and their practical applications.Expertise in SQL and database operations for effective data manipulation and analysis.Familiarity with GenAI technologies (LLMs, RAG, prompt engineering, vector databases).An understanding of MLOps practices and model deployment workflows.Experience with contemporary frameworks (TensorFlow, PyTorch, LangChain).Strong English written communication skills (C1+ level).Application Process:Apply → Pass qualification(s) → Join a project → Complete tasks → Get compensated.

May 4, 2026

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

Toloka AI

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

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 Submit your application. Complete the required qualifications. Join a project. Finish assigned tasks. Receive payment. Location: Remote , Virginia, United States Note: All roles are temporary and project-based.

Apr 25, 2026

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

toloka-ai

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

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 Apply Pass qualification(s) Join a project Complete tasks Receive payment This contract is remote and open to candidates based in Wisconsin, United States.

Apr 25, 2026

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Freelance Data Science AI Trainer (Python & SQL)

Mindrift

Contract|$90/hr - $90/hr|Remote|Remote — United States

We invite you to submit your resume in English, specifying your level of English proficiency.At Mindrift, we merge innovation with opportunity, harnessing the power of collective intelligence to ethically shape the future of AI.About UsThe Mindrift platform serves as a bridge connecting specialists with AI projects from leading tech innovators. Our mission is to unleash the potential of Generative AI by leveraging real-world expertise from around the globe.Role OverviewAs a Data Science AI Trainer, you will play a pivotal role in advancing GenAI models to tackle specialized questions and enhance complex reasoning skills. You will have the chance to collaborate on various unique projects.Your responsibilities may include:Crafting original computational data science challenges that replicate real-world analytical processes across sectors such as telecom, finance, government, e-commerce, and healthcare.Designing problems that require Python programming solutions (utilizing libraries like pandas, numpy, scipy, sklearn, statsmodels, matplotlib, seaborn).Ensuring that the challenges are computationally demanding and cannot be solved manually within feasible timeframes (days/weeks).Creating scenarios necessitating sophisticated reasoning in data processing, statistical analysis, feature engineering, predictive modeling, and insight extraction.Formulating deterministic problems with reproducible outcomes, avoiding stochastic elements or employing fixed random seeds for exact results.Grounding challenges in actual business scenarios focusing on customer analytics, risk assessment, fraud detection, forecasting, optimization, and operational efficiency.Designing comprehensive problems that cover the entire data science pipeline (data ingestion → cleaning → EDA → modeling → validation → deployment considerations).Integrating big data processing requirements that call for scalable computational strategies.Validating solutions through Python using standard data science libraries and statistical techniques.Clearly documenting problem statements within realistic business contexts and providing verified correct answers.Getting StartedTo join us, simply apply to this posting, meet the qualifications, and you can contribute to exciting projects that align with your skills, all while working on your own schedule. By creating training prompts and refining model responses, you will help shape the future of AI, ensuring that technology serves everyone.

Nov 27, 2025

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Material Scientist with Python - Freelance AI Trainer

toloka-ai

Contract|$76/hr - $76/hr|Remote|Remote — Virginia, United States

Please submit your CV in English and specify your English proficiency level. This freelance, project-based role with toloka-ai (via Mindrift) centers on testing, evaluating, and improving AI systems for technology clients. The work is remote and based in Virginia, United States. This position does not offer permanent employment. Role overview Material Scientists in this role design and document engineering problems that mirror real-world workflows. The focus is on creating computational challenges that require Python for calculations and simulations. Problems should involve numerical methods, iterative solutions, and reflect real research questions or practical engineering scenarios. Each task must be validated using Python and established engineering libraries, with clear documentation and verified solutions. Key responsibilities Develop original materials engineering problems based on real applications Create complex challenges requiring Python programming Ensure tasks are computationally intensive and use numerical or iterative methods Design scenarios involving system design, optimization, and analysis Validate solutions with Python and relevant libraries Document problem statements and provide verified solutions Requirements Degree in Material Science or a related discipline Strong Python skills for numerical validation; experience with MATLAB, R, C, SQL, Numpy, Pandas, SciPy, Stata, or similar languages is a plus Minimum of 2 years’ relevant experience (applied, research, or teaching) Understanding of practical engineering constraints and approximations Excellent written English (C1 level or above) Process Apply Pass qualification(s) Join a project Complete tasks Receive compensation Time commitment Projects generally require 10–20 hours per week during active periods. Actual workload may change depending on project needs. Compensation Contributors can earn up to $76 per hour, depending on experience, pace, and project scope. Rates may vary according to complexity and required expertise.

Apr 24, 2026

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Material Scientist with Python Expertise - Freelance AI Trainer

Toloka AI

Part-time|$76/hr - $76/hr|Remote|Remote — San Antonio, Texas, United States

Please submit your CV in English and indicate your level of English proficiency. Toloka AI, working with Mindrift, offers freelance, project-based assignments focused on advancing AI systems for technology clients. This contract role is temporary and centers on evaluating and improving AI through real-world engineering challenges. The position is remote and based in San Antonio, Texas, United States. Role overview This freelance assignment involves designing and validating material science problems that reflect actual engineering workflows. Assignments require both subject matter expertise and strong Python programming skills to create, test, and document computationally intensive tasks. What you will do Develop material engineering challenges based on authentic research questions or practical scenarios. Create problems that require Python programming for calculations, simulations, and numerical analysis. Ensure tasks involve computational complexity, using numerical methods or iterative solutions where appropriate. Design assignments related to system design, optimization, and analysis. Validate all solutions using Python and standard engineering libraries. Document each problem clearly and provide accurate, verified solutions. Requirements Degree in Material Science or a closely related discipline. Proficiency in Python for numerical validation. Experience with MATLAB, R, C, SQL, Numpy, Pandas, SciPy, or similar tools is a plus. Minimum of 2 years of professional experience in applied, research, or teaching roles. Solid understanding of engineering constraints and practical approximations. Excellent written English (C1 level or above). Project workflow Application Qualification Assessment Project Engagement Task Completion Compensation Time commitment During active project phases, expect to dedicate approximately 10–20 hours per week. Actual workload may fluctuate based on project requirements. Compensation Contributors may earn up to $76 per hour, depending on project complexity, contribution level, and pace. Compensation varies by assignment and expertise required. Other projects on the platform may offer different rates.

Apr 24, 2026

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Material Scientist with Python Expertise - Freelance AI Trainer

toloka-ai

Contract|$76/hr - $76/hr|Remote|Remote — New York, United States

We invite you to submit your CV in English, highlighting your proficiency level in the language.Mindrift serves as a bridge connecting talented professionals with project-based AI opportunities at leading technology firms, concentrating on the testing, evaluation, and enhancement of AI systems. Please note that this role is project-based and not a permanent position.Opportunity OverviewEach project presents unique challenges, and contributors may engage in the following tasks:Designing innovative material engineering problems that replicate authentic engineering workflows;Formulating problems necessitating Python programming for engineering calculations and simulations;Creating computationally intensive problems that demand numerical methods or iterative solutions;Developing problems related to system design, optimization, and analysis;Grounding problems in genuine research challenges or practical engineering applications;Validating solutions using Python alongside standard engineering libraries;Clearly documenting problem statements and providing verified correct solutions.Qualifications We SeekThis role is ideal for material scientists and engineers with Python experience who are open to part-time, non-permanent projects. Preferred qualifications include:A degree in Material Science or a related discipline;Proficiency in Python for numerical validation; familiarity with MATLAB, R, C, SQL, Numpy, Pandas, SciPy, domain-specific libraries, Stata, or any programming language is also acceptable;At least 2 years of relevant professional experience, including applied, research, or teaching roles;A solid understanding of practical engineering constraints and approximations;Strong command of written English (C1 level or higher).Project Engagement ProcessTo get started: Apply → Pass qualification(s) → Join a project → Complete assigned tasks → Receive payment.Project Time CommitmentTasks for this project are estimated to require approximately 10–20 hours per week during active phases, depending on project needs. This is an estimate and not a guaranteed workload.Compensation DetailsContributors can earn up to $76 per hour, varying based on experience and contribution pace. Note that compensation may differ across projects based on their specific requirements.

May 2, 2026

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Material Scientist with Python Expertise - Freelance AI Trainer

Mindrift

Part-time|$76/hr - $76/hr|Remote|Remote — Iowa, United States

We invite you to submit your CV in English, including your proficiency level in the language.Mindrift is a pioneering platform that connects specialists with exciting project-based AI opportunities at leading tech firms, with a focus on testing, evaluating, and enhancing AI systems. Please note that this is a project-based opportunity and not a permanent employment position.Opportunity Overview:Each project presents unique challenges, and contributors can expect to:Develop original materials and engineering problems that accurately replicate real-world engineering workflows;Craft problems that necessitate Python programming for the execution of engineering calculations and simulations;Ensure that problems are computationally rigorous and require numerical methods or iterative solutions;Create problems centered around system design, optimization, and analysis;Base problems on genuine research challenges or practical applications in engineering;Validate solutions through Python, utilizing standard engineering libraries;Clearly document problem statements and provide verified, correct solutions.Qualifications:This role is ideal for material scientists and engineers experienced in Python who are open to part-time, non-permanent projects. The ideal candidates will possess:A degree in Material Science or a related field;Strong proficiency in Python for numerical validation. Experience with MATLAB, R, C, SQL, Numpy, Pandas, SciPy, domain-specific libraries, Stata, or other programming languages will also be considered;A minimum of 2 years of professional experience, which can include applied, research, or teaching experience;An understanding of practical engineering constraints and approximations;Excellent written English skills (C1+ level).How the Process Works:Apply → Pass qualifications → Join a project → Complete assigned tasks → Receive payment.Project Time Requirements:For this role, the expected time commitment is approximately 10–20 hours per week during active project phases, depending on project needs. This is an estimate and does not guarantee specific workloads.Compensation:Contributors can earn up to $76 per hour, based on their experience and contribution pace. Compensation varies across projects depending on scope, complexity, and expertise requirements. Please note that other projects may offer different earning levels based on their specific needs.

May 2, 2026

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Material Scientist with Python Expertise - Freelance AI Trainer

Mindrift

Part-time|$76/hr - $76/hr|Remote|Remote — Iowa, United States

Please submit your CV in English, including your language proficiency level. Mindrift connects skilled professionals with freelance, project-based AI assignments for leading technology companies. Projects focus on testing, evaluating, and improving AI systems. This is not a permanent position. Role overview This freelance role centers on designing and validating material engineering challenges that mirror real-world workflows. Assignments require both subject matter expertise in material science and strong Python programming skills. What you will do Create engineering problems that reflect practical scenarios in material science Develop tasks requiring Python for engineering calculations, simulations, and computational analysis Design problems involving numerical methods, iterative solutions, system design, optimization, and analysis Base challenges on real research questions or practical engineering issues Validate problem solutions using Python and standard engineering libraries Document problem statements clearly and provide accurate, verified answers Requirements Degree in Material Science or a related discipline At least 2 years of professional experience (applied, research, or teaching) Proficient in Python for numerical validation; experience with MATLAB, R, C, SQL, Numpy, Pandas, SciPy, or similar tools is valued Strong understanding of practical engineering constraints and approximations Written English at C1 level or higher Interest in part-time, project-based work How to join Apply Pass qualifications Join a project Complete assigned tasks Receive compensation Time commitment During active projects, expect about 10–20 hours of work per week, depending on project needs. Actual workload may vary. Compensation Earn up to $76 per hour, based on expertise and contribution pace. Rates depend on project scope, complexity, and specialized knowledge. Some projects may offer different rates according to their requirements.

Apr 24, 2026

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Freelance AI Trainer - Material Scientist with Python Expertise

Mindrift

Part-time|$76/hr - $76/hr|Remote|Remote — Wisconsin, United States

Please submit your CV in English and include your English proficiency level. Mindrift connects professionals with project-based AI work for technology companies. Assignments focus on evaluating, testing, and improving AI systems. This is a project-based, non-permanent role. Role overview This freelance position centers on material science and Python programming. AI Trainers work on tasks such as: Designing original materials engineering challenges that mirror real-world workflows Creating problems that require Python programming for calculations and simulations Ensuring tasks are computationally intensive, using numerical methods or iterative solutions Developing scenarios for system design, optimization, and analysis Formulating problems based on research questions or practical engineering applications Validating solutions in Python with standard engineering libraries Documenting problem statements clearly and providing verified solutions Requirements Degree in Material Science or a closely related field Proficiency in Python for numerical validation; experience with MATLAB, R, C, SQL, Numpy, Pandas, SciPy, or similar tools is valued Minimum 2 years of relevant experience (applied, research, or teaching) Strong understanding of practical engineering constraints and approximations Excellent written English skills at C1 level or higher How to apply Submit your application Complete required qualifications Join a project Finish assigned tasks Receive payment Project commitment During active project phases, work typically ranges from 10 to 20 hours per week. Actual hours depend on project needs and are not guaranteed. Compensation Contributors can earn up to $76 per hour, depending on experience, pace, and project complexity. Actual rates vary by assignment. Location This is a remote contract role based in Wisconsin, United States.

Apr 24, 2026

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Material Scientist with Python Skills - Freelance AI Trainer

Mindrift

Contract|$76/hr - $76/hr|Remote|Remote — New York, United States

Please submit your CV in English and specify your English proficiency level. Mindrift connects experienced professionals with project-based AI assignments for leading technology companies. This freelance, project-based role does not offer permanent employment. Role overview This freelance AI Trainer position is open to candidates based in New York or elsewhere in the United States. Projects focus on materials science and Python programming, with each assignment presenting new technical challenges. The work is fully remote. What you will do Design materials engineering problems that reflect real-world engineering workflows. Create tasks involving Python programming for calculations and simulations. Develop problems that require computationally intensive approaches, such as numerical methods or iterative solutions. Build scenarios related to system design, optimization, and analysis. Base problems on authentic research challenges or practical engineering applications. Validate solutions in Python, using established engineering libraries. Document problem statements clearly and provide accurate, verified solutions. Requirements Degree in Material Science or a closely related discipline. Proficiency in Python for numerical validation. Familiarity with MATLAB, R, C, SQL, Numpy, Pandas, SciPy, or similar libraries is a plus. Minimum 2 years of professional experience (applied, research, or teaching). Strong understanding of practical engineering constraints and approximations. Excellent written English at C1 level or above. Project workflow Application → Qualification(s) → Project Engagement → Task Completion → Payment Time commitment Expect to dedicate roughly 10–20 hours per week during active project periods. Workload may vary depending on project needs and is not guaranteed. Compensation Rates can reach up to $76 per hour, depending on expertise and contribution speed. Pay may differ by project, reflecting scope, complexity, and required skills.

Apr 24, 2026

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Freelance Data Science Engineer (Python & SQL)

Toloka AI

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

We invite you to submit your CV in English, detailing your proficiency in the language.At Mindrift, we specialize in connecting talented professionals with project-based AI opportunities at leading technology firms, with a focus on testing, evaluating, and enhancing AI systems. Please note that participation is on a project basis and does not constitute permanent employment.Opportunity OverviewEach project presents unique challenges and contributors may be expected to:Design innovative computational data science tasks that replicate real-world analytical processes across various sectors, including telecom, finance, government, e-commerce, and healthcare.Develop problems requiring Python programming skills to solve, utilizing libraries such as Pandas, Numpy, Scipy, Sklearn, Statsmodels, Matplotlib, and Seaborn.Create computationally intensive problems that cannot be solved manually within a practical timeframe (days or weeks).Formulate tasks that necessitate complex reasoning chains in data processing, statistical analysis, feature engineering, predictive modeling, and insight extraction.Establish deterministic problems with reproducible solutions, avoiding stochastic elements unless fixed random seeds ensure exact replicability.Base problems on actual business challenges like customer analytics, risk assessment, fraud detection, forecasting, optimization, and operational efficiency.Design comprehensive tasks that encompass the entire data science pipeline, including data ingestion, cleaning, exploratory data analysis (EDA), modeling, validation, and deployment considerations.Integrate big data processing scenarios that require scalable computational strategies.Validate solutions using Python, employing standard data science libraries and statistical methods.Clearly document problem statements with realistic business contexts and provide verified accurate answers.What We SeekThis opportunity is ideally suited for data science specialists with extensive experience in Python who are open to part-time, non-permanent projects. The ideal candidates will possess:A minimum of 5 years of hands-on experience in data science with a demonstrated impact on business outcomes.A portfolio of completed projects and publications that showcase real-world problem-solving abilities.Proficiency in Python programming for data science, including libraries such as Pandas, Numpy, Scipy, Scikit-learn, and Statsmodels.Strong capabilities in statistical analysis and machine learning, with a deep understanding of algorithms, methods, and their practical applications.Expertise in SQL and database operations for data manipulation and analysis.Familiarity with GenAI technologies, including LLMs, RAG, prompt engineering, and vector databases.An understanding of MLOps practices and model deployment workflows.Knowledge of modern frameworks like TensorFlow, PyTorch, and LangChain.Excellent written English skills (C1+ level).Application ProcessApply → Pass qualification(s) → Join a project → Complete tasks → Get compensated.

May 5, 2026

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Material Scientist with Python Expertise - Freelance AI Trainer

Mindrift

Contract|$76/hr - $76/hr|Remote|Remote — San Antonio, Texas, United States

Interested candidates should submit their CV in English, detailing their level of English proficiency.Mindrift bridges the gap between specialists and project-based AI opportunities for top-tier tech firms, emphasizing the testing, evaluation, and enhancement of AI systems. Note that participation is project-based and does not equate to permanent employment.Key Responsibilities:Design innovative material engineering challenges that replicate real engineering processes.Develop problems that necessitate Python programming for engineering calculations and simulations.Ensure that challenges are computationally demanding, utilizing numerical methods or iterative solutions.Create problems that involve system design, optimization, and analysis.Base challenges on genuine research issues or practical engineering applications.Validate solutions using Python and standard engineering libraries.Clearly document problem statements and provide verified solutions.Ideal Candidate Profile:This opportunity is well-suited for material scientists and engineers with Python expertise who are open to part-time, non-permanent engagements. Preferred qualifications include:A degree in Material Science or a related field.Proficiency in Python for numerical validation; familiarity with MATLAB, R, C, SQL, Numpy, Pandas, SciPy, or any domain-specific libraries is also acceptable.A minimum of 2 years of professional experience in applied research, teaching, or industry.A solid understanding of practical engineering constraints and approximations.Exceptional written English skills (C1 or higher).Application Process:Interested applicants should apply, pass the necessary qualifications, join a project, complete assigned tasks, and receive compensation accordingly.Project Time Commitment:During active phases, tasks are anticipated to require approximately 10-20 hours per week, contingent on project demands. This estimate is not a guaranteed workload and applies only while the project is active.Compensation:Contributors can earn up to $76 per hour, depending on their contribution level and pace. Compensation varies by project scope, complexity, and required expertise, with different projects offering distinct earning potentials.

May 2, 2026

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Material Scientist with Python Expertise - Freelance AI Trainer Opportunity

Mindrift

Contract|$76/hr - $76/hr|Remote|Remote — Virginia, United States

We kindly request that applicants submit their CV in English and indicate their English proficiency level.Mindrift connects talented specialists with project-based AI opportunities at leading technology companies, focusing on the testing, evaluation, and enhancement of AI systems. Please note that participation is project-based and does not constitute permanent employment.Overview of the RoleEach project will present unique challenges, and contributors may be tasked with:Creating original materials that simulate authentic engineering problems;Designing challenges that involve Python programming for engineering calculations and simulations;Ensuring that problems are computationally intensive and utilize numerical methods or iterative solutions;Developing scenarios involving system design, optimization, and analysis;Formulating problems based on real-world engineering challenges or practical applications;Verifying solutions utilizing Python alongside standard engineering libraries;Clearly documenting problem statements and providing accurate solutions.What We Are SeekingThis opportunity is ideal for material scientists and engineers with Python experience who are interested in part-time, non-permanent projects. Preferred qualifications include:A degree in Material Science or a related field;Proficiency in Python for numerical validation, with familiarity in MATLAB, R, C, SQL, Numpy, Pandas, SciPy, or other domain-specific libraries seen as equivalent;At least 2 years of professional experience, whether applied, research, or teaching;A solid understanding of practical engineering constraints and approximations;Strong command of written English (C1+ level).How the Process WorksInterested candidates will apply, pass the required qualifications, join a project, complete assigned tasks, and receive payment.Project CommitmentDuring active phases, tasks are estimated to require approximately 10–20 hours per week based on project needs. This is an estimate and does not guarantee a specific workload.CompensationContributors can earn up to $76 per hour, depending on their input and contribution pace. Compensation varies across projects based on scope, complexity, and expertise required. Please note that earnings may differ for other projects on this platform.

May 2, 2026

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Freelance Data Science Engineer (Python & SQL)

toloka-ai

Contract|$90/hr - $90/hr|Remote|Remote — Iowa, United States

We invite you to submit your CV in English, along with your English proficiency level.At Mindrift, we bridge the gap between skilled professionals and project-based AI opportunities with leading technology firms. Our focus is on testing, evaluating, and enhancing AI systems. Note: Participation is project-based and does not lead to permanent employment.Opportunity Overview:Each project presents its own unique challenges, and contributors may be responsible for:Creating original computational data science problems that mirror real-world analytical workflows across diverse sectors including telecom, finance, government, e-commerce, and healthcare.Developing problems that necessitate Python programming for solutions (utilizing libraries such as Pandas, Numpy, Scipy, Sklearn, Statsmodels, Matplotlib, Seaborn).Ensuring that problems are computationally intensive, thus requiring several days or weeks to solve manually.Designing problems that involve complex reasoning pathways in data processing, statistical analysis, feature engineering, predictive modeling, and insight extraction.Formulating deterministic problems with reproducible outcomes, avoiding stochastic elements unless fixed random seeds are employed.Basing problems on actual business challenges such as customer analytics, risk assessment, fraud detection, forecasting, optimization, and operational efficiency.Crafting comprehensive problems that cover the entire data science pipeline (data ingestion → cleaning → exploratory data analysis → modeling → validation → deployment considerations).Integrating big data processing scenarios that demand scalable computational strategies.Validating solutions using Python and standard data science libraries alongside statistical methods.Clearly documenting problem statements within realistic business contexts and providing verified correct answers.Qualifications:This opportunity is ideal for Data Science specialists with Python expertise who are open to part-time, non-permanent projects. Preferred qualifications include:5+ years of practical data science experience demonstrating tangible business impact.A portfolio of completed projects and publications that showcase real-world problem-solving capabilities.Proficiency in Python programming for data science (including pandas, numpy, scipy, scikit-learn, statsmodels).Advanced statistical analysis and machine learning expertise, with a deep understanding of algorithms, methodologies, and their practical applications.Strong SQL skills and experience in database operations for data manipulation and analysis.Familiarity with GenAI technologies (LLMs, RAG, prompt engineering, vector databases).Understanding of MLOps practices and model deployment workflows.Knowledge of modern frameworks (TensorFlow, PyTorch, LangChain).Excellent written English proficiency (C1+).Process Overview:Application → Qualification Process → Project Engagement → Task Completion → Payment.

May 5, 2026

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Quantum Research Scientist Specializing in Python - Freelance AI Trainer

Toloka AI

Contract|$76/hr - $76/hr|Remote|Remote — New York, United States

We invite you to submit your CV in English and specify your level of English proficiency.Mindrift connects talented specialists with project-based AI opportunities for top technology firms, aiming to enhance the testing, evaluation, and advancement of AI systems. Please note that this is a project-based engagement, not a permanent role.Overview of the RoleWhile each project presents distinct challenges, contributors may:Devise original computational physics problems that emulate authentic physics research workflows;Develop problems that necessitate Python programming for resolution (utilizing libraries such as Numpy, SciPy, and Sympy);Ensure that problems are computationally demanding and cannot be solved manually within practical timeframes (days/weeks);Create problems that require complex reasoning across mechanics, electromagnetism, thermodynamics, and quantum mechanics;Base problems on genuine research challenges or practical applications within the field of physics;Validate solutions using Python alongside standard physics simulation libraries;Clearly document problem statements and provide verified correct answers.Qualifications We SeekThis position is ideally suited for quantum researchers proficient in Python, open to part-time, non-permanent projects. Preferred qualifications include:A degree in Physics (Theoretical, Experimental, or Computational) or a related discipline;Proficiency in Python for numerical validation; equivalent skills in MATLAB, R, C, SQL, Numpy, Pandas, SciPy, or any programming language are acceptable;At least 2 years of professional experience in applied research or teaching;Experience with numerical simulation techniques;Capability to design problems that reflect real-world physics research workflows;Innovative thinking in problem design across various physics sectors;Familiarity with physics modeling and approximation strategies;Strong written communication skills in English (C1 level or higher).How the Process WorksApply → Meet qualifications → Join a project → Complete assigned tasks → Receive compensation.Project Time CommitmentTasks for this project are anticipated to require approximately 10–20 hours per week during active phases, depending on project needs. This is an estimate and not a guaranteed workload.CompensationContributors can earn up to $76 per hour, based on their level of expertise and contribution pace. Compensation may vary by project, reflecting its scope, complexity, and required skills. Note that other projects on the platform may offer different compensation rates based on their specific requirements.

Apr 30, 2026

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Material Scientist with Python Expertise - Freelance AI Developer

Mindrift

Part-time|$76/hr - $76/hr|Remote|Remote — Wisconsin, United States

Please submit your CV in English along with your English proficiency level.Mindrift is a dynamic platform that bridges specialized talent with project-specific AI opportunities for prestigious tech companies, concentrating on the assessment, evaluation, and enhancement of AI systems. Please note that participation is project-based and does not constitute permanent employment.What this role offersEach project features distinct tasks; contributors may be required to:Craft innovative material engineering challenges that replicate real-world engineering processes;Develop problems that necessitate Python coding for solving engineering calculations and simulations;Ensure that problems are computationally demanding and utilize numerical methods or iterative approaches;Create issues that involve system design, optimization, and analytical assessment;Base challenges on genuine research dilemmas or practical applications from the field of engineering;Verify solutions using Python alongside standard engineering libraries;Clearly document problem statements and supply verified correct answers.What we seekThis opportunity is ideal for material scientists and engineers with Python experience who are open to part-time, project-based work. Preferred candidates will possess:A degree in Material Science or a related discipline;Proficiency in Python for numerical validation; familiarity with MATLAB, R, C, SQL, Numpy, Pandas, SciPy, domain-specific libraries, Stata, or knowledge of any programming language may be considered equivalent;A minimum of 2 years of professional experience, whether in applied projects, research, or teaching;An understanding of practical engineering limitations and approximations;Exceptional written English skills (C1+).How it operatesApply → Pass qualifications → Join a project → Complete tasks → Get compensatedProject time commitmentFor this project, tasks are anticipated to require approximately 10–20 hours per week during active phases, based on project needs. This is an estimate and not a guaranteed workload, applicable only while the project is active.CompensationContributors can earn up to $76 per hour, depending on their contribution level and efficiency. Compensation may vary across different projects based on the scope, complexity, and expertise required.

May 2, 2026

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

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