Looking for remote AI training or data labeling work open to applicants located in Croatia? OpenTrain is the hiring organization, and candidates apply through OpenTrain. OpenTrain may place or refer successful candidates to the client whose project they support. Review each posting because eligibility and role details can differ.
Apply advanced quantum optics expertise to benchmark AI systems and evaluate research-grade technical analyses. This remote contractor project offers global flexibility, approximately 10 hours per week, and $80–$160 per hour.
Posted Aug 2, 2026
Apply advanced AdS/CFT and mathematical physics expertise to review AI-generated solutions to research-level problems. This remote contractor engagement offers 10 hours per week for 8–10 weeks at $80–$160 per hour.
Posted Aug 2, 2026
Apply advanced condensed matter magnetism expertise to AI training involving magnetic structures, neutron scattering, magnetic space groups, and magneto-optic signatures. Remote contractor work runs about 8–10 weeks at approximately 10 hours per week.
Posted Aug 2, 2026
Apply advanced condensed matter and quantum information expertise to evaluate AI systems through exact diagonalization, symmetry methods, and quantum many-body benchmark analysis. Remote, part-time contract at $80–$160 per hour.
Posted Aug 2, 2026
Apply advanced statistical physics and quantum information expertise to evaluate AI-generated solutions, interpret simulations, and adjudicate technical research problems. Remote contract work requires about 10 hours weekly for 8–10 weeks at $80–$160 per hour.
Posted Aug 2, 2026
Apply your expertise in atomic, molecular, and optical physics to evaluate AI-generated reasoning, atomic-structure calculations, and spectroscopy analysis. Remote contractor work is worldwide, part-time, and pays $80–$160 per hour.
Posted Aug 2, 2026
Use your Kiembu and English language expertise to transcribe, annotate, and evaluate audio for AI training. This flexible remote contractor role offers approximately 20 hours per week for 1–3 months at $45–$95 per hour.
Posted Aug 2, 2026
Apply advanced chemistry expertise to help train and evaluate next-generation AI systems. This fully remote contract offers flexible part-time work worldwide at $70–$90 USD per hour, with 20+ hours per week.
Posted Aug 2, 2026
Help train next-generation AI by playing selected PC games, capturing synchronized gameplay data, and identifying bugs and anomalies. This remote contractor role pays $18 per hour and requires 20+ hours per week.
Posted Aug 2, 2026
Create research questions, answers, and benchmarking materials that help improve advanced language models. This remote contract offers flexible part-time work at $50–$60 per hour for strong researchers and communicators with an Apple Silicon Mac.
Posted Aug 2, 2026
Join OpenTrain AI to provide high-quality human feedback that improves generative models — evaluate and rank model outputs, run prompt and reasoning assessments, and contribute to RLHF and QA workflows. Expert-level role, 20+ hrs/week, 6+ months, contractor work in English (USD $1/hr).
Posted Aug 1, 2026
OpenTrain AI is hiring a senior software engineer to design production-like coding benchmarks and safety tests for frontier coding agents. Contractor role: remote, 20+ hrs/week (min 4 hrs/day), 4–8 week assignment; Python required and 8+ years' experience.
Posted Aug 1, 2026
Join OpenTrain to evaluate Spanish-language AI responses for real small-business scenarios: craft prompts, run short chatbot conversations, and rate outputs for clarity, usefulness, and accuracy. Part-time contractor role (20+ hrs/week), fully remote and worldwide.
Posted Aug 1, 2026
Join OpenTrain AI to complete project-based strategic finance exercises—15 hours/week at $85–$100/hr—producing graded deliverables like business cases, capital-allocation rankings, pricing recommendations, and market-sizing analyses.
Posted Aug 1, 2026
OpenTrain AI seeks an expert corporate treasury professional to create and grade document-based treasury exercises: 13-week cash forecasts, FX netting and hedge design, hedge designation and effectiveness testing, and treasury policy drafting. Contract, part-time, remote, $85–$100/hr.
Posted Aug 1, 2026
Join OpenTrain as a part-time, remote Investor Relations expert working on earnings materials, investor-day decks, ownership analysis and activist vulnerability assessments; paid $85–$100/hr for under 20 hours/week and open worldwide to English speakers.
Posted Aug 1, 2026
Probe conversational AI models and agents for jailbreaks, prompt injections, bias, and other safety failures. This expert, remote contract role offers flexible part-time work at $48–$62 per hour for fluent English and Swedish speakers.
Posted Jul 31, 2026
Join OpenTrain as a Generalist AI Training Contributor to write, edit, and organize documentation that helps train generative AI systems — part-time contractor work, remote, 20+ hours/week, $25–$50/hr.
Posted Jul 30, 2026
Join OpenTrain AI to evaluate developer and cloud tools, create technical documentation, and design integrated workflows—remote contractor work 20+ hrs/week, paid $40–$80/hr. Help train AI with high-quality engineering-focused feedback.
Posted Jul 30, 2026
Record high‑quality Mandarin audio for AI training on a flexible part‑time contract (20+ hrs/week). Native Mandarin speakers with professional studio experience and clean recording setups can earn $20–$40/hr for a 1–3 month project.
Posted Jul 30, 2026
Record studio-quality German voice samples for AI training on a flexible, part-time contractor schedule; paid $20–$40 USD/hour and requiring native German fluency and professional recording experience.
Posted Jul 30, 2026
Record high-quality native Italian audio for AI training projects on a flexible, part-time contract paying $20–$40/hr. Join OpenTrain AI to contribute recordings, follow scripted prompts, and help shape how Italian-speaking systems understand natural speech.
Posted Jul 30, 2026
Join OpenTrain as an AI Model Reviewer to evaluate and generate high-quality examples, prompts, and rationales that improve model reasoning — remote, contractor work at $100–$180/hr for 20+ hours/week. Ideal for experts in law, education, engineering, science, or writing.
Posted Jul 30, 2026
Join OpenTrain AI as a Semiconductor Devices & Microelectronics Expert to create and review technical explanations that train generative AI models; remote contractor role paying $66–$130/hr for 20+ hours/week. Use your device-physics and microfabrication expertise to rate and generate text for AI tr
Posted Jul 30, 2026
Join OpenTrain to evaluate and improve AI-generated mechanical engineering content across mechanics, thermodynamics, fluids, heat transfer, vibrations, and manufacturing; part-time contractor role at $80–$100/hr, 20+ hours/week. Provide detailed technical judgments and written rationales to train ne
Posted Jul 30, 2026
OpenTrain AI seeks experienced electrical engineers to evaluate and rate AI-generated circuit designs and technical answers across analog, digital, mixed-signal, power, and RF. Remote contractor role, 20+ hrs/week, $80–$130/hr to help shape high-quality technical AI reasoning.
Posted Jul 30, 2026
Apply your mechanical design and CAD expertise to train and evaluate AI models for engineering workflows. Part-time remote contractor work (under 20 hrs/week) paying $66–$130/hr, no prior AI experience required.
Posted Jul 30, 2026
Record and edit high-quality Thai speech for AI training as a part-time contractor — earn $10–$30/hr while working 20+ hours/week remotely. Open to native or near-native Thai speakers with professional recording gear and editing experience.
Posted Jul 30, 2026
Join OpenTrain AI as a CRM Operations Specialist to evaluate CRM workflows, annotate CRM data, and validate AI outputs for real-world sales operations. Part-time contractor work (20+ hrs/wk) at $40–$80/hr, remote and worldwide — bring Salesforce/HubSpot experience.
Posted Jul 30, 2026
Record high-quality Tamil audio for AI training in a remote, part-time contract role—paid $10–$30/hr with a typical commitment of 20+ hours/week. Use professional equipment to deliver clean, natural spoken samples and perform quality checks.
Posted Jul 30, 2026
AI training and data labeling work can involve preparing or reviewing examples used by 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. A remote role that accepts applicants located in Croatia is not necessarily physically based there, and each posting determines its own location rules and responsibilities.
OpenTrain is the hiring organization for roles available through OpenTrain, and candidates apply through OpenTrain. OpenTrain may place or refer successful candidates to the client whose project they support. Individual postings control eligibility, qualifications, experience, pay, hours, schedule, location rules, and client-specific requirements, so read the relevant listing for the details that apply.
