Find remote AI training and data labeling jobs open to applicants in Brazil.
Review legal documents and AI-generated responses for civil and commercial litigation work. Earn $80 to $170 per hour equivalent, paid per task that meets project specifications, with flexible part-time work.
Posted Oct 13, 2026
Coordinate contributors, workforce data, onboarding, and project capacity across AI training work. This remote, 16-week freelance role also includes comparing chatbot responses and making final assessments.
Posted Oct 13, 2026
Guide quality decisions for AI annotation and chatbot evaluation projects. You will lead calibration, resolve difficult cases, review audits, and improve guidelines in a remote, project-based role.
Posted Oct 13, 2026
Lead quality strategy for large-scale AI training data and chatbot evaluation programs. Build quality systems, guide QA teams, and improve delivery across a 16-week project.
Posted Oct 13, 2026
Review AI chatbot responses against detailed guidelines, explain your judgments, and help improve model behavior. This entry-level contract role requires English fluency, strong attention to detail, and 20+ hours per week.
Posted Oct 13, 2026
Assess Python-focused large language model responses for accuracy, reasoning, and quality, then give clear feedback that supports model improvement. This worldwide contract role requires 20+ hours per week, fluent English, a relevant master's degree, and three years of experience.
Posted Oct 13, 2026
Evaluate large language model answers, design challenging prompts, and check responses against structured data and evidence. This remote, four-week contractor assignment offers 20, 30, or 40 hours per week with Pacific Time overlap.
Posted Oct 13, 2026
Evaluate computer-using AI agents by researching claims, solving reasoning tasks, and rating model responses. This worldwide freelance role offers ongoing work for 20 or more hours per week.
Posted Oct 13, 2026
Review transformed datasets and documents for missed or mishandled personal information, record discrepancies, and give clear feedback. Pay is $31 to $60 per hour, with applications starting through OpenTrain.
Posted Oct 12, 2026
Review and improve annotated video data for AI training projects. This remote contract role offers flexible work for experienced video annotation professionals available for 20+ hours per week.
Posted Oct 10, 2026
Annotate video footage by creating and reviewing bounding boxes, correcting errors, and following detailed project guidelines. This remote, part-time contract role requires three or more years of annotation experience, English fluency, and 20+ hours per week.
Posted Oct 10, 2026
Use advanced life sciences knowledge to write, review, and improve AI-generated scientific responses. This contract role offers 20+ hours per week and requires English fluency plus advanced research experience.
Posted Oct 10, 2026
Review inpatient pediatric records, clinical notes, and AI outputs for medical accuracy and documentation quality at $80 to $115 per hour. This remote, part-time contractor role requires a board-certified pediatric physician with recent hospitalist experience.
Posted Oct 10, 2026
Review inpatient adult medicine records, FHIR data, and clinical notes for AI training at $80 to $115 per hour. This part-time contract role requires an MD or DO, Internal Medicine board certification, and recent hospitalist practice.
Posted Oct 10, 2026
Review short video and audio clips, assess AI-generated descriptions, and explain content-quality decisions using clear project guidelines. This remote contract role pays $8 to $10 per hour and requires fluent English.
Posted Oct 10, 2026
Review AI-generated fixed income and rates research, backtests, and systematic trading strategies as a contractor. Earn $80-$150 per hour and apply through OpenTrain before completing the hiring-site application.
Posted Oct 10, 2026
Review AI-generated rates trading strategies for realism, market viability, and risk awareness using your professional rates-market experience. This part-time contract pays $80 to $100 per hour, with applications through OpenTrain.
Posted Oct 10, 2026
Review inpatient medical records, clinical notes, and FHIR data to improve AI systems. This remote contractor role pays $80 to $115 per hour and requires board-certified family medicine expertise plus recent hospitalist practice.
Posted Oct 10, 2026
Manage annotation, data collection, analysis, reporting, and quality workflows for AI training projects. This entry-level contract role pays $40 to $60 per hour and requires at least 20 hours weekly.
Posted Oct 9, 2026
Create realistic Earth sciences tasks for AI training and evaluation using scientific code, environmental datasets, simulations, and automated tests. This remote contractor role is open worldwide and requires fluent English and advanced technical experience.
Posted Oct 9, 2026
Review code, simulations, circuit designs, automated tests, and technical AI evaluation tasks while guiding a pod of 5 to 10 trainers. This four-week contractor assignment requires advanced technical experience, Linux skills, and at least 20 hours per week.
Posted Oct 9, 2026
Lead a pod of technical trainers creating and reviewing chemical engineering tasks for AI training. Evaluate simulations, models, graders, and engineering results using advanced technical judgment.
Posted Oct 9, 2026
Lead AI training tasks that evaluate mechanical and aerospace engineering simulations, computational models, and technical feedback. This role suits advanced engineers with strong programming and simulation expertise.
Posted Oct 9, 2026
Review civil and structural engineering models, simulations, reference solutions, and automated graders for AI evaluation tasks. This remote contractor assignment requires advanced engineering experience, programming skills, and at least 20 hours per week.
Posted Oct 9, 2026
Build MCP tools, improve AI coding assistant workflows, and create production-ready data applications for agentic AI systems. This part-time contract role is open worldwide and requires 20 or more hours each week.
Posted Oct 9, 2026
Design realistic coding-agent benchmark tasks using production-like software, security tests, and evaluation tools. This remote contractor role requires strong Python skills, deep software engineering experience, and at least 20 hours per week.
Posted Oct 9, 2026
Translate CUDA and C++ code into Python, test model-generated implementations, and assess GPU algorithms using PyTorch and NumPy. This remote contractor assignment requires at least 20 hours per week and strong English communication.
Posted Oct 9, 2026
Review AI-generated aerospace electrical simulation work using CAD models, schematics, and engineering judgment. This expert contract role requires at least 10 years of experience and 20 to 40 hours per week with Pacific Time overlap.
Posted Oct 9, 2026
Review AI answers to business, strategy, and operations questions, then rate their reasoning and write feedback. This remote contract pays $150 per hour and requires English fluency and business experience.
Posted Oct 9, 2026
Review complex dermatology cases and AI model outputs remotely, lead consensus, and document clinical reasoning. This four-week contractor engagement requires academic dermatology credentials and pays per task.
Posted Oct 9, 2026
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.
