Find remote AI training and data labeling jobs open to applicants in Brazil.
Create audit-and-patch tasks for AI coding models by reproducing software vulnerabilities, writing security tests, and reviewing generated patches. This remote contractor project requires 20 or more hours per week.
Posted Nov 12, 2026
Annotate tissue types and functional structures in whole-slide histopathology images from laboratory animals. This expert contract offers a fixed $40 payment and flexible work under 20 hours per week.
Posted Nov 12, 2026
Annotate and contour de-identified CT and MRI scans for an AI training dataset. This remote contract role offers flexible hours and suits experts in radiology or medical imaging.
Posted Nov 12, 2026
Review legal documents, research, citations, and other paralegal work used to train AI systems. Earn $40 to $80 per hour equivalent, paid per task that meets project specifications, with flexible remote work.
Posted Nov 11, 2026
Review legal citations, authorities, source materials, and AI outputs in a focused two-week project. Paralegals and law students with current cite-checking skills can earn $50 to $120 per hour.
Posted Nov 11, 2026
Create realistic bugs, features, refactoring, and performance tasks that test AI coding ability. This part-time contractor role pays $50 to $100 per hour equivalent, paid per task that meets project specifications.
Posted Nov 11, 2026
Work remotely on AI training projects involving Godot game development, gameplay systems, and technical reviews. Earn $70 to $130 per hour with flexible weekly hours over 1 to 3 months.
Posted Nov 11, 2026
Create and review circuit designs in DesignSpark PCB, explain PCB workflows, and evaluate technical work for an AI training project. The role pays $63 to $122 per hour and is remote for candidates in listed countries.
Posted Nov 11, 2026
Create digital paintings, character designs, concept art, animations, and other visual assets in Krita while explaining your creative workflows. This remote contractor role pays $21 to $70 per hour.
Posted Nov 11, 2026
Evaluate AI answers about QuickBooks, bookkeeping, financial reporting, reconciliations, and small-business accounting. This fully remote contract role requires 20+ hours per week and strong accounting experience.
Posted Nov 11, 2026
Build thermal and CFD simulation workflows for PCB assemblies and electronic systems using OpenFOAM, Gmsh, and Python. This remote contract requires 20+ hours each week and is open worldwide.
Posted Nov 11, 2026
Review and rate AI answers about bookkeeping, reporting, reconciliations, audits, and small-business accounting. This remote freelance project requires QuickBooks Online experience, strong English, and 20+ hours per week.
Posted Nov 11, 2026
Build multi-step AI agents for mathematical research, turning proofs and technical material into reliable software systems. This remote contractor role is open across Latin America and pays $25 per approved task.
Posted Nov 11, 2026
Create and evaluate engineering simulation benchmarks for AI agents using Python and open-source tools. This remote contractor engagement lasts up to 12 weeks, with part-time work accepted and required Pacific Time overlap.
Posted Nov 11, 2026
Perform electromagnetic and signal integrity simulations for high-speed PCB designs, analyze interconnect behavior, and build Python workflows. The project is worldwide, requires English, and supports 20+ hours per week for about 13 weeks.
Posted Nov 11, 2026
Review medical information and AI-generated responses for accuracy, clinical relevance, and sound reasoning. Use your medical expertise to identify errors and provide clear, evidence-based feedback in a remote, part-time project role.
Posted Nov 11, 2026
Review emergency medicine scenarios and AI-generated medical responses for accuracy, completeness, and safe clinical reasoning. This remote, part-time project is for physicians with emergency medicine experience and fluent English.
Posted Nov 11, 2026
Review AI-generated radiology content, identify clinical and reasoning errors, and explain your findings using established imaging principles. This remote, part-time project is open to qualified radiologists in participating countries.
Posted Nov 11, 2026
Evaluate AI coding tasks using real repository code, technical rubrics, and clear written feedback. The role pays $50 to $100 per hour equivalent, paid per task that meets the project specifications, for about 15 hours per week.
Posted Nov 11, 2026
Use your family medicine or primary care expertise to evaluate AI-generated medical responses, apply project guidelines, and explain clinical judgments. This part-time, project-based role is open in many countries, with applications starting through OpenTrain.
Posted Nov 11, 2026
Create and review graduate-level biology problems that test AI systems on experiments, data, figures, sequences, structures, and scientific reasoning. This remote contractor assignment requires at least 20 hours per week and professional English fluency.
Posted Nov 11, 2026
Review and correct Welsh conversational audio transcripts for a 1,350-hour AI voice dataset. Pay is $30 to $35 per hour, with full-time weekday work from mid-November through December 31, 2026.
Posted Nov 11, 2026
Build, debug, and evaluate full-stack software and AI-generated code across front-end and back-end systems. Earn $50 to $100 per hour equivalent, paid per task that meets the project specifications, for under 20 hours per week.
Posted Nov 11, 2026
Work remotely as a medical imaging clinician annotator, outlining image regions and checking metadata for a large medical image dataset. Pay is $30 to $55 per hour for less than 20 hours per week.
Posted Nov 11, 2026
Review AI-generated federal equal employment analyses for accuracy, fairness, and compliance. Use EEO law, OPM standards, and federal HR experience to improve model outputs at $60 to $90 per hour.
Posted Nov 11, 2026
Build and improve open source software by adding features, fixing complex bugs, refactoring legacy code, and reviewing code. Pay is $50 to $100 per hour equivalent, paid per task that meets the project specifications.
Posted Nov 10, 2026
Evaluate Rust repositories, tests, and bug-fixing tasks to measure how AI coding systems perform. This remote LATAM contract pays $25 per approved task and requires 20+ hours per week.
Posted Nov 10, 2026
Evaluate open-source C# code, tests, and bug-fixing tasks used to assess AI models. This remote contractor role pays $25 per label and requires fluent English, software engineering skills, and 20+ hours per week.
Posted Nov 10, 2026
Review and rate LLM software engineering outputs using Golang codebases, GitHub issues, and unit tests. This contract role pays $25 per label, requires 20+ hours weekly, and is open across 23 listed countries and territories.
Posted Nov 10, 2026
Work remotely on Java open-source repositories, testing code and evaluating how well language models solve realistic bugs. The one-month contract pays $25 per approved task and is open to contractors in Latin America.
Posted Nov 10, 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.
