Find remote AI training and data labeling jobs open to applicants in Brazil.
Evaluate AI-generated biomedical engineering content for accuracy, safety, assumptions, and regulatory concerns at up to $40 to $100 per hour. Work 20+ hours per week as a contractor from an eligible country.
Posted Jul 8, 2026
Review AI-generated biology answers, assess scientific reasoning, and write accurate model solutions at up to $70 per hour. This remote contract role offers ongoing work for qualified biology specialists.
Posted Jul 8, 2026
Review AI-generated ads, write campaign assets, and rate model responses for strategy, clarity, compliance, and platform fit. This remote contractor role pays up to $35 to $70 per hour and requires 20+ hours weekly.
Posted Jul 8, 2026
Build and evaluate machine learning models with Python, MongoDB, and common ML libraries in a remote, part-time contractor role paying $80 to $140 per hour. Apply through OpenTrain, then complete the hiring site application.
Posted Jul 3, 2026
Remote Backend C#/.NET Developer contract work pays $60 to $110 per hour. Build backend services, REST APIs, and MySQL systems while supporting reliable software for AI-related projects.
Posted Jun 28, 2026
Review PDF and DOCX files, extract legal and financial information, and correct AI-generated JSON outputs against the source documents. This contract project pays $8 to $11.20 per hour for fewer than 20 hours each week.
Posted May 14, 2026
Review accounting and finance documents, correct OCR errors, label document regions, and structure tables and financial fields. Work 20 or more hours per week at $7 to $9 per hour.
Posted Apr 27, 2026
Rate image quality metrics and review image quality assessment tools in a photography-focused AI training project. Work 20 or more hours per week at $5-$7 per hour.
Posted Apr 15, 2026
Design computer science problems and evaluate AI-generated solutions using Python, structured scoring, and clear technical reasoning. This global contract role pays $15 to $40 per hour for up to 20 hours weekly during active project phases.
Posted Apr 5, 2026
Create and verify realistic, computationally intensive data science problems using Python, SQL, statistics, machine learning, and GenAI. This global contract offers flexible project work for experienced data science specialists.
Posted Apr 5, 2026
Create and verify computational machine learning and STEM problems using Python, statistics, SQL, and modern AI tools. This global, project-based contract pays $15 to $40 per hour for about 10 to 20 hours weekly during active phases.
Posted Apr 5, 2026
Build and review advanced automation workflows, JavaScript logic, and AI-generated solutions for APIs, webhooks, and business processes. Earn $15 to $45 per hour on a flexible, worldwide contract.
Posted Mar 29, 2026
Build and review API integrations that help train and evaluate AI systems. Work part time from anywhere on REST APIs, webhooks, data mapping, and error handling.
Posted Mar 29, 2026
Build and improve automation workflows powered by large language models. You will refine prompts, review model outputs, and create evaluation criteria for practical communication and content tasks.
Posted Mar 29, 2026
Build, test, and improve Zapier and Make.com workflows used to train and evaluate AI systems. This part-time contractor role pays $15 to $45 per hour and is open worldwide.
Posted Mar 29, 2026
Create research-level computational chemistry problems, verified solutions, and Python-based validation workflows. This part-time contractor role pays $15 to $60 per hour based on task complexity and expertise.
Posted Mar 29, 2026
Create and verify original electrical engineering problems using Python, with work spanning system design, optimization, control, and power systems. This worldwide contract role pays $15 to $50 per hour and takes fewer than 20 hours per week.
Posted Mar 29, 2026
Create realistic civil and computational engineering problems, then verify solutions with Python and engineering libraries. This part-time contract pays $15 to $50 per hour and is open worldwide.
Posted Mar 29, 2026
Work globally as a Vibecode Specialist building Python scrapers for complex, JavaScript-heavy websites. Earn $20 per hour while delivering clean, validated datasets for AI training.
Posted Feb 26, 2026
Design realistic tests for AI agents, define expected behavior, and review model outputs. This part-time contract pays $18 to $24 per hour and requires 20 or more hours each week.
Posted Jan 13, 2026
Transcribe short Korean recordings for $14 per hour in a long-term, part-time role with about one flexible hour of work each day. You will also review audio and flag unclear segments.
Posted Jan 7, 2026
Create and verify Python-based mechanical engineering problems that help train and evaluate AI models. This flexible contract role pays $10-$45 per hour and requires advanced English, Python, and relevant engineering expertise.
Posted Dec 12, 2025
Design and verify complex Python and SQL problems that test full-pipeline data science skills for advanced AI systems. This worldwide contractor role pays $50 per hour for fewer than 20 hours per week.
Posted Dec 3, 2025
Segment recycling images by outlining individual objects with polygons in CVAT and the Segment Anything tool. This entry-level contract role pays $5 per hour and values accuracy and careful visual review.
Posted Nov 11, 2025
Review and improve AI-generated answers to automotive engineering questions for $40 per hour. This flexible, part-time contract requires 3+ years of automotive engineering experience and Python skills.
Posted Oct 1, 2025
AI training and data labeling involve human work used to prepare and review examples for artificial-intelligence systems. Depending on the individual role, tasks can include labeling images or video, transcribing or recording audio, writing or rating model responses, evaluating search results, translating text, reviewing code, or applying subject-matter knowledge. For applicants located in Brazil, only the individual posting can confirm whether that opportunity accepts applications from Brazil and explain the work involved.
OpenTrain is the hiring organization for these roles, and candidates apply through OpenTrain. OpenTrain may place or refer successful candidates to the client whose project they will support. Review each individual posting for the details and requirements that apply to that opportunity, including whether applicants located in Brazil are eligible.
