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Remote AI training and data labeling jobs in Brazil

Find remote AI training and data labeling jobs open to applicants in Brazil.

  • 100% remote
  • Flexible hours
  • Hourly / per-task pay
  • 273 open roles

Application Security AI Evaluation Expert

Build secure and vulnerable application fixtures, deterministic tests, and evaluation assets for AI systems. This remote contractor role pays $40 to $80 per hour, offers flexible scheduling, and requires strong application security skills.

Coding & Software
Computer Code Programming
Remote · United Arab Emirates, Argentina, Austria +49 more
English
Part-time · Flexible
Entry level
Hourly · $40–$80/hr

Posted Oct 15, 2026

Life Sciences Research Scientist

Evaluate AI-generated answers to advanced life sciences questions, design expert-level problems, and write evidence-based rubrics. This remote contractor role pays $45 to $90 per hour and requires a life sciences PhD, laboratory research experience, and C1-level English.

Generative AI & RLHF
Text
Remote · United Arab Emirates, Argentina, Austria +49 more
English
Part-time · Flexible
Entry level
Hourly · $45–$90/hr

Posted Oct 15, 2026

Clinical Microbiome And Translational Research Scientist

Review and improve AI-generated scientific answers across microbiome, metagenomics, clinical genomics, and translational research for $45 to $90 per hour. This remote contractor role requires a relevant PhD, laboratory research experience, and professional English.

Generative AI & RLHF
Text
Remote · United Arab Emirates, Argentina, Austria +49 more
English
Part-time · Flexible
Entry level
Hourly · $45–$90/hr

Posted Oct 15, 2026

Computational Chemistry Drug Discovery Scientist

Help train AI systems by creating and evaluating expert problems in computational chemistry, structural biology, and drug discovery. This part-time contractor role pays $45 to $90 per hour and requires a relevant PhD.

Generative AI & RLHF
Text
Remote · United Arab Emirates, Argentina, Austria +48 more
English
Part-time · Flexible
Entry level
Hourly · $45–$90/hr

Posted Oct 15, 2026

Computational Biology And Bioinformatics Expert

Evaluate computational chemistry workflows, simulation outputs, and scientific software for AI benchmarking. This remote contractor role pays $45 to $90 per hour and requires a PhD or equivalent experience.

Generative AI & RLHF
Document
Remote · United Arab Emirates, Argentina, Austria +49 more
English
Part-time · Flexible
Entry level
Hourly · $45–$90/hr

Posted Oct 15, 2026

Applied Scientist AI Model Evaluation

Earn $245 to $280 per hour as a remote contractor evaluating AI model responses, designing experiments, and creating prompts and reference solutions. Use Python, statistics, and machine learning to find errors and improve model quality.

Generative AI & RLHF
Text
Remote · United Arab Emirates, Argentina, Austria +49 more
English
Part-time · Flexible
Entry level
Hourly · $245–$280/hr

Posted Oct 15, 2026

Business Analyst, Chatbot Response Evaluation

Evaluate chatbot responses against business requirements for accounting and finance applications. This remote, 16-week freelance project requires 20+ hours weekly across five working days, with two weekdays off.

Generative AI & RLHF
Text
Remote · Worldwide
English
Part-time · Flexible
Entry level

Posted Oct 15, 2026

AI Training Staffing Supply Manager

Manage staffing, capacity planning, tracking systems, and chatbot assessments across AI training projects in a remote, 16-week freelance role. The project expects 20 or more hours weekly and at least five years of professional experience.

Generative AI & RLHF
Text
Remote · Worldwide
English
Part-time · Flexible
Entry level

Posted Oct 15, 2026

Business Analyst, Computer-Using Agent Evaluation

Evaluate AI-generated responses and actions, research claims, solve reasoning tasks, and write feedback that improves computer-using AI agents. This entry-level contract role is open worldwide and requires 20 or more hours each week.

Generative AI & RLHF
Text
Remote · Worldwide
English
Part-time · Flexible
Entry level
Hourly pay

Posted Oct 15, 2026

Dermatology Clinical AI Evaluation Expert

Review complex dermatology cases, resolve clinical disagreements, and evaluate AI model outputs in a remote, task-based freelance role. The work runs for four weeks with flexible scheduling and occasional calls.

Medical & Health
Document
Remote · Worldwide
English
Part-time · Flexible
Entry level

Posted Oct 15, 2026

BA Generalist (English), Creative Data Annotation

Review AI-generated responses to social scenarios, apply clear guidelines, and explain your judgments in English. This remote project offers flexible scheduling, 20+ hours per week, and lasts about 2 to 3 weeks.

Generative AI & RLHF
Text
Remote · Worldwide
English
Part-time · Flexible
Entry level
Per task

Posted Oct 15, 2026

Product Management AI Training Expert

Build and evaluate AI-generated product roadmaps, feature specifications, and backlogs using professional product management standards. Work remotely for 20+ hours each week with at least eight hours of PST overlap.

Generative AI & RLHF
Document
Remote · Worldwide
English
Part-time · Flexible
Entry level

Posted Oct 15, 2026

Medical Doctor AI Training (Korean)

Review clinical cases and AI-generated medical content for healthcare AI at $125 per hour. This remote, part-time contract role requires Korean and English fluency plus medical practice experience.

Medical & Health
Document
Remote · United Arab Emirates, Argentina, Austria +49 more
Korean, English
Part-time · Flexible
Mid-Senior level
Hourly · $125/hr

Posted Oct 14, 2026

Medical AI Reviewer (Japanese)

Review clinical materials, patient cases, and AI model outputs for medical quality and consistency. This part-time contract pays $125 per hour and requires fluent Japanese and advanced English.

Medical & Health
Document
Remote · United Arab Emirates, Argentina, Austria +49 more
Japanese, English
Part-time · Flexible
Entry level
Hourly · $125/hr

Posted Oct 14, 2026

Retail AI Training Expert (English)

Review AI-generated retail scenarios, workflows, sales content, and customer service interactions for real-world accuracy. Use your retail expertise in a remote role paying $40 to $70 per hour.

Generative AI & RLHF
Text
Remote · United Arab Emirates, Argentina, Austria +49 more
English
Part-time · Flexible
Entry level
Hourly · $40–$70/hr

Posted Oct 14, 2026

Agriculture, Forestry And Environmental AI Training Expert

Use professional expertise in agriculture, forestry, and environmental science to review AI outputs, datasets, documents, and policy guidance. The part-time contractor role pays $40 to $60 per hour and is open in listed countries.

Generative AI & RLHF
Document
Remote · United Arab Emirates, Argentina, Austria +49 more
English
Part-time · Flexible
Entry level
Hourly · $40–$60/hr

Posted Oct 14, 2026

Multilingual Coding AI Evaluation Expert

Review, debug, and improve AI-generated code and technical responses across multiple languages. This remote, four-week contract offers flexible 20+ hour weeks with per-task compensation.

Coding & Software
Computer Code Programming
Remote · Worldwide
English, Russian +18 more
Part-time · Flexible
Entry level
Per task

Posted Oct 14, 2026

Dermatology Medical Expert for Nutrition AI Evaluation

Review AI-generated nutrition content, label dietary data, and check food information for accuracy and safety. This remote, eight-week contractor assignment needs nutrition or dietetics expertise and takes 20+ hours per week.

Medical & Health
Text
Remote · Worldwide
English
Part-time · Flexible
Entry level

Posted Oct 14, 2026

Electrical Engineering and Computer Science Pod Lead

Lead a 5 to 10 person technical pod creating and evaluating terminal-based coding, scientific computing, and electrical engineering tasks for AI training. The role requires 20+ hours per week and advanced technical experience.

Coding & Software
Computer Code Programming
Remote · Worldwide
English
Part-time · Flexible
Entry level

Posted Oct 14, 2026

Multimodal AI Annotation Quality Operations Lead

Lead quality operations for multimodal AI annotation projects, including chatbot comparisons and final assessments. Manage QA teams, track performance, and improve review accuracy in a 16-week remote freelance role.

Generative AI & RLHF
Text
Remote · Worldwide
English
Part-time · Flexible
Entry level

Posted Oct 14, 2026

Business Analyst, Chatbot Response Evaluation

Review chatbot responses against business requirements, document findings, and support testing and workflow analysis in a fully remote 16-week project. The role requires fluent English, a relevant bachelor's degree, and at least two years of business analysis experience.

Generative AI & RLHF
Text
Remote · Worldwide
English
Part-time · Flexible
Entry level

Posted Oct 14, 2026

Dermatology Life Science Domain Expert

Review complex dermatology cases, resolve clinical disagreements, and evaluate AI model outputs in a remote, four-week contract. The work is paid per task and averages 20+ hours per week.

Medical & Health
Text
Remote · Worldwide
English
Part-time · Flexible
Entry level

Posted Oct 14, 2026

Bioinformatics Workflow Task Executor

Execute structured sequence-analysis and molecular-biology workflows in UGENE for a remote AI training project. Work with supplied files, produce documented outputs, and contribute 20+ hours weekly for about five weeks.

General Annotation
Image
Remote · Worldwide
English
Part-time · Flexible
Entry level
Per task

Posted Oct 14, 2026

Human Data Operations Manager Candidate

Manage annotation and data-collection workflows, track KPIs, analyze datasets, and improve quality for AI training. This remote contract role offers 20+ hours per week across eligible countries.

General Annotation
Text
Remote · United Arab Emirates, Argentina, Austria +49 more
English
Part-time · Flexible
Entry level

Posted Oct 14, 2026

Investment Banking AI Training Specialist

Review financial models, valuations, research, and pitch materials to help improve AI reasoning about investment banking. This remote contractor role pays $175 to $300 per hour and requires advanced transaction experience.

Legal & Finance
Document
Remote · United Arab Emirates, Argentina, Austria +49 more
English
Part-time · Flexible
Mid-Senior level
Hourly · $175–$300/hr

Posted Oct 14, 2026

Software Engineer Open Source Coding Contributor

Build coding tasks, reference solutions, and verifiers that test AI software engineering systems. This remote contractor role pays $50 to $100 per hour equivalent, paid per task that meets the project specifications.

Coding & Software
Computer Code Programming
Remote · United Arab Emirates, Argentina, Austria +49 more
English
Part-time · Flexible
Entry level
Per task · $50–$100/hr equivalent

Posted Oct 14, 2026

Backend Software Engineer for AI Coding Tasks

Create backend coding tasks that help train AI systems, including bug fixes, features, refactoring, and performance work. Pay is $50 to $100 per hour equivalent, paid per task that meets project specifications.

Coding & Software
Computer Code Programming
Remote · United Arab Emirates, Argentina, Austria +49 more
English
Part-time · Flexible
Entry level
Per task · $50–$100/hr equivalent

Posted Oct 14, 2026

Competitive Data Scientist

Evaluate challenging data science tasks, build reference solutions, and test coding agents remotely for about 15 hours per week. Compensation is $60 to $120 per hour equivalent, paid per task that meets the project specifications.

Coding & Software
Computer Code Programming
Remote · United Arab Emirates, Argentina, Austria +49 more
English
Part-time · Flexible
Entry level
Per task · $60–$120/hr equivalent

Posted Oct 13, 2026

Principal Research Scientist in AI Evaluation

Guide AI models through open problems, proofs, algorithms, numerical experiments, and high-performance simulations in a remote contractor role paying $100 to $400 per hour. Flexible part-time or full-time availability is open to candidates in listed countries.

Generative AI & RLHF
Text
Remote · United Arab Emirates, Argentina, Austria +49 more
English
Part-time · Flexible
Entry level
Hourly · $100–$400/hr

Posted Oct 13, 2026

Computer Science and Physics Research Scientist

Investigate open problems in computer science and computational or mathematical physics using AI models, proofs, algorithms, and simulations. This flexible contract pays $100 to $400 per hour.

Coding & Software
Text
Remote · United Arab Emirates, Argentina, Austria +49 more
English
Part-time · Flexible
Entry level
Hourly · $100–$400/hr

Posted Oct 13, 2026

What this work can involve

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.

  • Read each posting to confirm its specific tasks and responsibilities.
  • Work may involve language, content, code, media, search evaluation, or another form of data review.
  • The live posting is the source of truth for eligibility and other role-specific details.

How hiring works through OpenTrain

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.

  • Candidates apply through OpenTrain.
  • Check the individual posting for its stated eligibility and requirements.
  • The live posting provides the details for the role and the client project it supports.

Frequently asked questions

What can this work involve?
AI training and data labeling work can involve preparing or reviewing examples for artificial-intelligence systems. Depending on the role, tasks may 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. The individual posting explains the actual responsibilities.
Where can I find role-specific details?
Find role-specific details in the individual live posting. It is the source of truth for whether applicants located in Brazil are eligible, along with the responsibilities, qualifications, experience, pay, hours, schedule, location rules, and client-specific requirements for that opportunity.
How does hiring work through OpenTrain?
OpenTrain is the hiring organization for roles on OpenTrain, and candidates apply through OpenTrain. OpenTrain may place or refer successful candidates to the client whose project they will support. Review the individual posting for the requirements and conditions that apply to that role.