Looking for remote AI training or data labeling work open to applicants located in Portugal? OpenTrain is the hiring organization for these roles. Candidates apply through OpenTrain, and OpenTrain may place or refer successful candidates to the client whose project they will support. Each live posting determines eligibility and provides the responsibilities, qualifications, hours, location rules, pay, and other details for that role.
Use advanced Python, SQL, statistics, machine learning, and GenAI expertise to author realistic data science problems that help train and evaluate AI systems. This remote, project-based contractor role pays $15 to $40 per hour.
Posted Apr 5, 2026
Use expert Python, statistics, SQL, and GenAI knowledge to create and verify challenging computational machine learning problems. This project-based remote contract offers $15 to $40 per hour.
Posted Apr 5, 2026
Use your Chinese localization expertise and C1 English skills to evaluate, fact-check, and improve AI-generated content. This remote contractor role offers flexible work of 20 or more hours per week.
Posted Apr 3, 2026
Evaluate and red-team large language models in Hebrew and English, documenting safety failures and policy gaps. This fully remote contractor role pays $26-$38 per hour for 20+ hours weekly.
Posted Apr 3, 2026
Work remotely as a French and English AI Safety LLM Evaluator, reviewing model responses, red-teaming safety boundaries, and creating evaluation data. Earn $24 to $36 per hour while helping improve safer AI systems.
Posted Apr 3, 2026
Review and improve French-language AI responses as a remote, hourly contractor. Use expert judgment in French linguistics, reasoning quality, editing, and bilingual communication while earning $16 to $26.50 per hour.
Posted Apr 3, 2026
Evaluate AI-generated content and safety decisions in Spanish and English as a remote contractor earning $14-$24 per hour. Use red-teaming, policy judgment, and clear analytical feedback to help improve safer AI systems.
Posted Apr 3, 2026
Evaluate AI-generated content in Arabic and English, identify unsafe or adversarial behavior, and provide clear feedback for safer language models. This fully remote contractor role offers $15-$40 per hour with a 20+ hour weekly commitment.
Posted Apr 3, 2026
Review and improve Arabic-English AI responses, assess reasoning and factual accuracy, and write model solutions in a flexible remote contractor role paying $6-$12 per hour.
Posted Apr 3, 2026
Use your biology expertise to evaluate AI-generated responses, fact-check scientific reasoning, and write clear model explanations. This worldwide contractor role pays $25 to $55 per hour, with a listed rate of $45 per hour.
Posted Apr 3, 2026
Help improve AI-generated medical and public health responses through clinical reasoning, fact-checking, written feedback, and response ranking. This remote contractor role offers part-time work under 20 hours per week and pays $25 to $72 per hour.
Posted Apr 2, 2026
Help train and evaluate AI systems for infrastructure design, scalable automation, and real-world DevOps workflows. This remote contractor role offers $15-$45 per hour and requires 20+ hours weekly.
Posted Mar 29, 2026
Use Make.com, n8n, and JavaScript to build and evaluate reliable AI automation workflows. This remote contractor role offers 20+ hours weekly and pay of $15 to $45 per hour through OpenTrain.
Posted Mar 29, 2026
Use your REST API and webhook expertise to create prompts and evaluate AI-generated integrations between CRMs, SaaS tools, ad platforms, and databases. Work remotely as a part-time contractor for 20+ hours per week.
Posted Mar 29, 2026
Build and refine LLM-powered automation workflows as an intermediate AI Workflow Engineer. Evaluate outputs, design prompts, and improve communication and content automation for $15 to $45 per hour.
Posted Mar 29, 2026
Help train AI systems to design reliable, scalable n8n automations. Build prompts, evaluate workflow outputs, and improve complex integrations in a flexible remote contractor role paying $15 to $45 per hour.
Posted Mar 29, 2026
Use your Zapier and Make.com expertise to build, test, and evaluate automation workflows that help train advanced AI systems. This flexible contractor role offers 20+ hours per week at $15 to $45 per hour.
Posted Mar 29, 2026
Use Python and quantitative finance expertise to create and verify challenging, research-style problems for AI training. Work remotely as a part-time contractor for 20+ hours per week at $15 to $60 per hour.
Posted Mar 29, 2026
Use advanced Python and statistical expertise to create and validate challenging research-style problems for AI training. This remote contractor role offers flexible part-time work at $15-$60 per hour.
Posted Mar 29, 2026
Use advanced Python and computational biology expertise to design and verify challenging research problems for AI training. This flexible, project-based contractor role offers $15 to $60 per hour and requires 20+ hours weekly.
Posted Mar 29, 2026
Create advanced computational and quantum chemistry problems, verify solutions with Python, and model authentic research workflows. This part-time contract pays $15-$60 per hour based on task complexity.
Posted Mar 29, 2026
Use advanced Python and research experience to create and verify challenging computational physics problems, from mechanics to quantum mechanics. This global, part-time contractor role offers 20+ hours per week and project-based pay of $15 to $60 per hour.
Posted Mar 29, 2026
Create original, research-style mathematics problems and verify them computationally in Python for AI training. This expert contractor role offers flexible remote work for 20 or more hours weekly at listed rates of $15 to $60 per hour.
Posted Mar 29, 2026
Create realistic mechanical engineering problem sets and fully verified Python solutions for computational methods, optimization, system design, and analysis. This worldwide contract role offers 20+ hours per week and pays $15 to $50 per hour.
Posted Mar 29, 2026
Use electrical engineering expertise and Python to create, solve, and verify realistic computational problems for AI training. This flexible contractor role requires a relevant degree, strong English, and at least two years of experience.
Posted Mar 29, 2026
Use civil engineering expertise and Python to create realistic computational problems, verify solutions, and help train advanced AI systems. This flexible contractor role offers 20+ hours per week at $15-$50 per hour.
Posted Mar 29, 2026
Review US driver's license images and label personal, document, and visual fields for document understanding models. This entry-level, worldwide contractor role offers flexible part-time work and $1 to $7 per hour.
Posted Mar 24, 2026
Design and launch high-converting ecommerce pages and brand storefronts with Shopify, Webflow, Squarespace, or WordPress. This flexible, part-time contract role pays $10 to $25 per hour and requires a strong portfolio.
Posted Mar 11, 2026
Build a specialized SFT dataset and fine-tune Qwen3-Coder for JUCE/C++ audio DSP. This worldwide expert contractor role offers flexible part-time work at 20+ hours per week for a $1,000 fixed price.
Posted Feb 27, 2026
Use Python, automation, and AI tools to extract accurate structured data from complex websites. This global, part-time contractor role pays $20 per hour and requires 20+ hours weekly.
Posted Feb 26, 2026
AI training work involves preparing and reviewing examples used by artificial-intelligence systems. Roles open to applicants located in Portugal can involve annotating 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 live posting explains which responsibilities and requirements apply.
OpenTrain is the hiring organization for roles open to applicants located in Portugal. Candidates apply through OpenTrain. OpenTrain may place or refer successful candidates to the client whose project they will support. Refer to each individual live posting for every other role-specific detail.
