Mechanical Engineer - Piping & Pressure Systems (Contract)

Please submit your CV in English and include your proficiency level. toloka-ai, in partnership with Mindrift, offers freelance opportunities for optical engineers to contribute to project-based AI work. This remote position is not a permanent role but centers on short-term assignments. The focus is on testing, evaluating, and improving AI systems related to optics and physics. Role overview This freelance role involves designing original optics problems that reflect real research workflows. Assignments require developing computationally intensive challenges that may take days or weeks to solve. Problems span advanced topics in mechanics, electromagnetism, thermodynamics, and quantum mechanics, often inspired by real research or practical applications. Each problem must be clearly documented with accurate, verified solutions. What you will do Design optics problems modeled after real-world research processes. Create complex, computationally demanding challenges. Develop problems requiring advanced reasoning across multiple physics domains. Base problem design on authentic research challenges or practical scenarios. Document each problem and provide precise solutions. Requirements Degree in Physics (theoretical, experimental, or computational) or a related field. At least 2 years of relevant experience in applied work, research, or teaching. Experience with numerical simulation techniques. Ability to design problems that reflect real research processes in physics. Creative problem-solving skills across mechanics, electromagnetism, thermodynamics, and quantum mechanics. Understanding of physics modeling and approximation methods. Proficient written English (C1 level or above). Interest in part-time, temporary projects as a freelance optical engineer. Project commitment During peak project periods, expect to dedicate approximately 10–20 hours per week, though workload may shift depending on project needs. Compensation Earn up to $26 per hour, depending on expertise and pace. Actual pay varies by project scope, complexity, and required skills. Other projects on the platform may offer different rates. How to apply Apply with a CV in English, including your proficiency level. If qualified, join a project. Complete assigned tasks. Receive compensation for your work. Location: Remote , Pretoria, Gauteng, South Africa

Please submit your CV in English and specify your level of English proficiency. Toloka AI connects specialists with AI projects from leading technology companies. The team works on testing, evaluating, and improving AI systems. All roles are project-based and do not constitute permanent employment. Role overview This freelance position is designed for optical engineers with strong Python skills who are interested in part-time, project-based assignments. Each project presents new technical challenges and a variety of tasks, such as: Developing computational physics problems modeled on real research workflows Designing problems that require Python programming to solve, often using Numpy, SciPy, or Sympy Ensuring problems are complex enough that manual solutions would take days or weeks Creating scenarios involving advanced reasoning in mechanics, electromagnetism, thermodynamics, and quantum mechanics Basing problems on genuine research challenges or practical physics applications Validating solutions with Python and standard physics simulation libraries Documenting problem statements clearly and providing accurate, verified solutions Requirements Degree in Physics (theoretical, experimental, or computational) or a related field Proficiency in Python for numerical validation; experience with MATLAB, R, C, SQL, Numpy, Pandas, SciPy, Stata, or similar programming languages is also suitable Minimum of 2 years of professional experience (applied, research, or teaching) Background in numerical simulation techniques Ability to design problems that reflect real-world physics research Creative problem-solving across multiple physics domains Familiarity with physics modeling and approximation methods Strong written English skills (C1 level or higher) Project commitment During active project phases, tasks typically require 10–20 hours per week. Actual workload will vary based on project needs and is not guaranteed outside active phases. Compensation Participants can earn up to $26 per hour, depending on contribution and pace. Compensation varies by project scope, complexity, and expertise required. Other projects on the Toloka AI platform may offer different earning potentials based on their specific requirements. Application process Submit your application Pass the qualification stage Join a project Complete assigned tasks Receive payment Location: Remote , Pretoria, Gauteng, South Africa

toloka-ai is looking for a freelance Civil Engineer and Python Specialist to support AI training initiatives. This position is remote, based in Pretoria, Gauteng, South Africa, and allows for flexible work arrangements from any location. Key responsibilities Contribute civil engineering expertise to AI training projects Develop and refine AI training tools using Python Work closely with team members to achieve project objectives and deliverables Role details Freelance contract Remote work Projects blend engineering and programming skills

Please submit your CV in English and indicate your level of English proficiency. Mindrift connects subject matter experts with project-based AI work for major technology companies. As a Freelance Research Physicist - AI Systems Trainer, this position is freelance and project-based, not a permanent role. Role overview Freelance Research Physicists help shape and test the abilities of AI systems in physics. Project tasks vary, but often include: Designing original optics problems modeled after real-world research workflows Developing computationally intensive problems that may require extended solution times Creating scenarios that require advanced reasoning in mechanics, electromagnetism, thermodynamics, and quantum mechanics Grounding problems in actual research challenges or practical situations in optics and physics Documenting problem statements and providing accurate, verified solutions Requirements Degree in Physics (theoretical, experimental, or computational) or a closely related field At least 2 years of relevant experience, which may include research, applied, or teaching roles Experience with numerical simulation techniques Ability to create problems that reflect authentic research processes in physics Creative problem-solving skills across multiple physics specialties Knowledge of modeling and approximation methods in physics Strong written English skills at C1 level or higher Project workflow Apply Pass qualifications Join a project Complete assigned tasks Receive compensation Time commitment During active projects, expect to contribute roughly 10–20 hours per week. Actual hours depend on project needs and may fluctuate outside of live project phases. Compensation Rates go up to $26 per hour, based on expertise and work pace. Compensation may vary by project complexity and requirements. Other projects on the Mindrift platform may offer different pay rates depending on their needs. Location This is a remote, project-based role open to candidates in Pretoria, Gauteng, South Africa.

Toloka AI is hiring a freelance Mechanical Engineer & Python Specialist to support AI training programs. This remote contract role is based in Pretoria, Gauteng, South Africa. The position blends mechanical engineering experience with strong Python programming skills to advance artificial intelligence learning projects. Key responsibilities Create and deliver training materials that integrate mechanical engineering concepts with Python programming for AI applications Work closely with the team to design clear, engaging content for learners Participate in a distributed team focused on ongoing learning and new ideas Requirements Degree or background in mechanical engineering Solid Python programming skills Interest in artificial intelligence and a desire to help others learn Ability to work independently and manage tasks remotely

Toloka AI seeks a Freelance Junior Journalist - AI Trainer to assist with content creation and review for AI application projects. This contract position is remote, with a focus on candidates based in Pretoria, Gauteng, South Africa. Key responsibilities Create and review written material to support the training and improvement of AI algorithms Use journalistic skills to ensure content is clear and accurate Work on projects that influence the direction of AI-driven content Who will thrive in this role Journalists early in their careers who are interested in technology Writers who enjoy exploring new tools and processes Individuals seeking experience in the AI sector while working remotely

Toloka AI seeks a Freelance English Writer and AI Trainer to support its AI training projects. This contract position welcomes applicants based in Pretoria, Gauteng, or working remotely from anywhere in South Africa. Role overview This role centers on crafting written content that helps guide and enhance AI training. The focus is on producing material that is clear, engaging, and easy to follow. What you will do Create written resources to assist AI training processes Develop content that is informative and straightforward Collaborate with the Toloka AI team to achieve project objectives Location This is a remote position. Candidates located in Pretoria, Gauteng, or elsewhere in South Africa are encouraged to apply.

This freelance role with Mindrift focuses on supporting the assessment, testing, and improvement of AI systems for technology companies. The position is project-based, not permanent, and is open to candidates based in Pretoria, Gauteng, South Africa, or working remotely. Key Responsibilities Create original computational statistics problems modeled on real mathematical research processes Develop problems that require Python programming solutions, using libraries such as Numpy, SciPy, and Sympy Design challenging problems that may require days or weeks to solve Write problems involving advanced reasoning in fields like number theory, combinatorics, graph theory, and numerical analysis Base problems on genuine research challenges or practical mathematical applications Validate solutions in Python using standard mathematical libraries Document problem statements clearly and provide verified answers Requirements Degree in Statistics or a related field Proficiency in Python for numerical validation; experience with MATLAB, R, C, SQL, Numpy, Pandas, or SciPy is valued At least 2 years of professional experience (applied, research, or teaching) Strong written English skills at C1 level or above Professional certifications (such as CMME, SAS Certifications, CAP) and experience with international or applied projects are considered a plus Application Process Submit a CV in English, including language proficiency level Complete required qualifications Join a project Complete assigned tasks Receive compensation Project Commitment Project phases typically require a commitment of 10 to 20 hours per week. Actual hours may vary depending on project needs. Compensation Compensation can reach up to $21 per hour, depending on expertise and speed. Pay varies based on project scope and complexity.

Mindrift connects subject matter experts with project-based AI work at leading technology companies. This freelance role focuses on developing and validating computational chemistry problems that require advanced Python programming. Assignments are temporary and project-based, not permanent employment. What you will do Create computational chemistry problems based on real research workflows and practical applications. Design problems that require Python solutions, using libraries such as numpy, scipy, and chemistry-specific packages. Ensure each problem is complex enough that manual solutions would take days or weeks. Develop challenges involving physical chemistry, quantum chemistry, and molecular modeling. Validate solutions in Python, following standard computational chemistry methodologies. Document each problem clearly and provide accurate, verified answers. Requirements Degree in Chemistry or a related field. Proficiency in Python for numerical validation. Experience with MATLAB, R, C, SQL, Numpy, Pandas, SciPy, or similar libraries is also valued. At least 2 years of professional experience (applied work, research, or teaching). Background in numerical methods used in chemistry. Familiarity with computational chemistry concepts and methods. Strong written English skills at C1 level or higher. Project details Workload is estimated at 10–20 hours per week during active project phases. Actual hours may vary depending on project needs and are not guaranteed for the full project duration. Compensation Contributors can earn up to $26 per hour, depending on project complexity, scope, and individual performance. Compensation may differ for other projects. How to apply Submit your CV in English, clearly stating your English proficiency level. The process includes qualification steps before joining a project: Apply, pass qualification(s), join a project, complete tasks, and receive payment.

Submit your CV in English and indicate your English proficiency level. toloka-ai, in partnership with Mindrift, offers project-based assignments for subject matter experts in AI and material science. These freelance roles focus on testing, evaluating, and improving AI systems for technology clients. This is not a permanent employment contract; work is assigned per project. Role overview Freelance AI Trainer & Material Scientist assignments vary by project. Typical work includes: Creating original materials that mirror real engineering workflows Designing engineering problems that require Python programming for calculations and simulations Ensuring tasks are computationally intensive, using numerical methods or iterative approaches Developing challenges in system design, optimization, and analysis Grounding problems in research challenges or practical engineering applications Validating solutions using Python and standard engineering libraries Documenting problem statements and providing thoroughly checked solutions Preferred qualifications Degree in Material Science or a related discipline Proficiency in Python for numerical validation; experience with MATLAB, R, C, SQL, Numpy, Pandas, SciPy, or similar libraries is valued Minimum 2 years of professional experience (applied, research, or teaching) Understanding of practical engineering constraints and approximations Excellent written English (C1 level or above) Project process Apply Complete qualifications Join a project Fulfill assigned tasks Receive payment Time commitment During active project phases, expect to work approximately 10–20 hours per week. Workload may fluctuate and is not guaranteed outside these periods. Compensation Earn up to $26 per hour, depending on contribution and pace. Actual rates are based on project scope, complexity, and required expertise. Other projects on the platform may offer different pay structures.

Mindrift offers project-based roles for experienced professionals looking to contribute to AI development in the supply chain field. This freelance position is remote and open to candidates in Pretoria, Gauteng, South Africa. The work is not permanent and assignments depend on project availability. Role overview The Freelance Supply Chain Consultant - AI Trainer role focuses on using procurement and supply chain knowledge to improve AI systems. The work involves designing realistic disruption scenarios, defining expected outcomes and mitigation strategies, and evaluating AI-generated recommendations for accuracy and business value. What you will do Create supply chain disruption scenarios based on real issues such as supplier delays, quantity changes, logistics challenges, and quality failures. Define anticipated results and effective mitigation steps for each scenario. Review and critique AI-generated insights, checking them against established business logic. Assess outputs for accuracy, completeness, and relevance within ERP systems (including Microsoft Dynamics 365, Coupa, Jaggaer, and Ariba). Support structured data creation and validation according to provided guidelines. Requirements Minimum 4 years of hands-on experience in procurement, supply chain management, or purchasing, preferably in manufacturing. Strong understanding of procurement processes: purchase orders, vendor management, inventory control, and production planning. Direct experience with ERP platforms such as SAP, Oracle, or Microsoft Dynamics 365. Ability to design and analyze supply chain disruption scenarios and mitigation strategies. Familiarity with disruption types like delays, shortages, quality issues, and logistics problems. Knowledge of Incoterms, logistics, and transportation management. Understanding of Bill of Materials structures and production planning workflows. Experience tracking supplier performance metrics (such as OTIF, lead times, and quality assessments). Analytical skills for evaluating AI outputs against business logic. Background in data validation, structured data entry, or annotation tasks. Strong written English communication skills. How to participate Apply Complete qualification steps Join a project Carry out assigned tasks Receive compensation Time commitment Workload is estimated at 10-20 hours per week during active project phases. Actual hours may vary and are not guaranteed. Compensation Rates are up to $50 per hour, depending on project specifics.

Please submit your CV in English and indicate your English proficiency level. Toloka AI, working with Mindrift, offers freelance, project-based roles for quantum research scientists and AI trainers with strong Python backgrounds. These roles are not permanent and are designed for those interested in testing, evaluating, and improving AI systems for major technology companies. Key responsibilities Create original computational physics challenges that reflect real-world research processes. Develop problems requiring Python solutions, using libraries such as Numpy, SciPy, or Sympy. Design computationally intensive tasks that cannot be solved manually in a short timeframe. Formulate problems involving advanced reasoning in areas like mechanics, electromagnetism, thermodynamics, and quantum mechanics. Base challenges on authentic research questions or practical physics issues. Validate solutions in Python with standard physics simulation tools. Document problem statements clearly and provide verified, accurate answers. Who will succeed in this role Holds a degree in Physics (theoretical, experimental, or computational) or a closely related field. Proficient in Python for numerical validation. Experience with MATLAB, R, C, SQL, Numpy, Pandas, or SciPy is a plus. Has at least 2 years of experience in applied research or teaching. Familiar with numerical simulation methods. Skilled at designing problems that mirror actual research workflows in physics. Brings creative problem-solving skills across multiple physics domains. Understands modeling and approximation techniques in physics. Demonstrates excellent written English (C1 level or higher). Workflow steps Application Qualification Assessment Project Participation Task Completion Compensation Time commitment During active projects, tasks typically require 10–20 hours per week. Actual workload may shift depending on project needs. Compensation Contributors can earn up to $26 per hour, depending on experience and work pace. Rates vary by project based on complexity, scope, and required skills. Other projects on the platform may offer different rates as well. Location This is a remote position based in Pretoria, Gauteng, South Africa.

Toloka Annotators is hiring a Freelance Data Annotator to assist with AI model training. This contract position is remote and open to candidates based in Pretoria, Gauteng, South Africa. Key responsibilities Label and annotate data accurately to support the development of machine learning models Apply project instructions to maintain consistent and reliable data quality Handle data carefully to contribute to the improvement of AI systems Role focus This contract is well suited to those interested in artificial intelligence and hands-on work with technology. Strong attention to detail is essential, as your efforts will directly influence the quality and usefulness of AI tools and applications.

Please submit your resume in English and indicate your language proficiency. Toloka connects people worldwide with freelance online tasks that support the development of artificial intelligence systems. The Annotators team collaborates with major technology companies on Generative AI projects, drawing on a wide range of backgrounds to advance AI through collective effort. Role overview As a Freelance AI Trainer – English Annotator, the focus is on helping AI systems interpret and understand real-world information. Tasks may involve evaluating AI-generated text, checking for factual accuracy, and comparing different responses. The specific work assigned will depend on current project requirements. Key responsibilities Review data sets, which may include text, images, or videos, for accuracy. Label and categorize content based on project guidelines. Identify and report content that is incorrect, sensitive, inappropriate, or unclear. Project details This freelance role is project-based. Tasks become available only when projects are active, and invitations to participate may vary depending on your profile and current openings. Compensation Pay varies by project and experience. AI trainers can earn up to $9 per hour. Location Remote , Pretoria, Gauteng, South Africa

Please submit your CV in English and indicate your language proficiency. Mindrift connects skilled professionals with project-based AI roles at leading technology companies. This freelance position is remote and based in Pretoria, Gauteng, South Africa. The work is project-based and does not constitute permanent employment. Role overview The Freelance AI Agent Evaluation Engineer will help build a dataset to assess AI coding agents. The main focus is evaluating how these agents perform on practical developer tasks. This involves designing complex assignments and creating fair evaluation criteria within simulated environments that reflect real-life development settings. Main responsibilities Create virtual companies according to a strategic plan, including setting up codebases, infrastructure, and realistic context such as conversations, documentation, and tickets to simulate a development history. Develop and refine tasks based on the evolving state of these virtual companies. Draft prompts, define evaluation criteria, and ensure tasks are solvable and fairly assessed. Design assignments for isolated environments that mimic a developer’s workstation: a Linux machine with development tools (terminal, CLI), MCP servers (repository, task tracker, messenger, documentation), and a real web application codebase. Write tests that accept all valid solutions and reject incorrect ones. Find the right balance between strictness and leniency to ensure good approaches are not penalized and weak solutions do not pass. Work with AI agents on test cases, making sure tests uncover genuine issues, do not miss faulty solutions, and properly validate successful ones. Review code produced by AI agents, analyze reasons for success or failure, and design edge cases and adversarial scenarios. Iterate on your work based on feedback from expert QA reviewers who check your output against quality standards. What this role does not cover Data labeling Prompt engineering Writing code from scratch (the AI agent generates most code; your focus is on guidance and evaluation) Much of the work involves collaborating with AI systems. Creating tasks that challenge advanced models means working closely with these agents.

Please submit your CV in English and specify your English proficiency level. toloka-ai, in partnership with Mindrift, offers project-based contract work for subject-matter experts in AI. These projects involve testing, evaluating, and improving AI systems for leading technology companies. This is not a permanent employment offer, but a contract-based opportunity. Role overview This freelance research physicist role focuses on creating and validating computational physics problems for AI training. Each project comes with its own requirements. Contributors may: Develop original computational physics problems that reflect real research workflows Design problems that require Python programming to solve, using libraries like Numpy, SciPy, and Sympy Ensure problems are computationally challenging and cannot be solved by hand in a short timeframe Include complex reasoning in fields such as mechanics, electromagnetism, thermodynamics, and quantum mechanics Base problems on actual research challenges or practical physics applications Verify solutions through Python and standard physics simulation libraries Document problem statements clearly and provide accurate, validated answers Requirements Degree in Physics (theoretical, experimental, or computational) or a closely related field Strong Python skills for numerical validation; experience with MATLAB, R, C, SQL, Numpy, Pandas, SciPy, or similar libraries is a plus At least 2 years of professional experience in applied research or teaching Background in numerical simulation methods Ability to design problems that mirror real research workflows in physics Creative problem-solving across multiple domains of physics Solid understanding of physics modeling and approximation techniques Excellent written English (C1 level or higher) How projects work Apply Pass qualifications Join a project Complete assigned tasks Receive payment Time commitment During active project phases, tasks typically require 10–20 hours per week. Actual hours may vary depending on project needs. Compensation Contributors can earn up to $26 per hour, depending on contribution level and pace. Rates may differ by project based on complexity, scope, and required expertise. Location: Remote , Pretoria, Gauteng, South Africa

Toloka AI is looking for a freelance consultant with strong skills in biology and Python programming. This remote role is based in Pretoria, Gauteng, South Africa. Role overview The main focus is on creating training materials and leading learning sessions. The goal is to help others apply AI tools and methods in biological research and related fields. What you will do Develop clear and practical training content covering biology and Python topics Facilitate sessions that guide participants in using AI for biological applications Requirements Expertise in biology and Python programming Ability to communicate technical concepts to learners Interest in AI applications within biological research

toloka-ai seeks a Senior Consultant to contribute to a freelance AI project. This contract role is fully remote, with a focus on candidates located in Pretoria, Gauteng, South Africa. Role overview This position centers on leading and advising AI-focused initiatives. The Senior Consultant will use consulting experience to guide project teams as they develop new artificial intelligence solutions for toloka-ai. Key responsibilities Advise and lead AI-related projects, providing strategic direction. Draw on consulting experience, especially from top-tier firms such as MBB. Support teams as they build and implement artificial intelligence solutions. Requirements Extensive consulting background, ideally with experience at a leading firm (MBB). Proven track record in AI projects or technology-driven initiatives. Ability to work independently in a freelance, remote setting. Location and work style This is a remote freelance contract. Applicants should be based in, or able to work from, Pretoria, Gauteng, South Africa.

Role overview Toloka AI seeks a Freelance Legal Consultant with expertise in US law to contribute to AI training initiatives. This remote position is open to professionals located in Pretoria, Gauteng, South Africa. The consultant will use legal knowledge to help strengthen the accuracy and compliance of AI systems. What you will do Collaborate with AI training teams to review and refine content involving US legal matters. Assess AI-generated outputs for legal accuracy and ensure alignment with US regulations. Offer legal guidance to inform the development of AI models focused on legal subject areas. Location This is a remote role, but applicants must reside in Pretoria, Gauteng, South Africa.