Looking for remote AI training or data labeling work open to applicants located in Bulgaria? This work can support AI systems through tasks such as reviewing examples, labeling data, or evaluating model responses. OpenTrain is the hiring organization for roles on OpenTrain. Candidates apply through OpenTrain, and OpenTrain may place or refer successful candidates to the client whose project they will support.
Contract role to design and evaluate computer-science problems and validate AI solutions using Python (NumPy/Pandas/SciPy). Remote, project-based work paying $15–$40/hr with a typical commitment of ~10–20 hours/week during active phases.
Posted Apr 5, 2026
Join OpenTrain to design reproducible, industry-grade data science problems and prompts for GenAI training; contract, part-time work (≈10–20 hrs/week) with pay up to $40/hr. Ideal for senior data scientists with expert Python, SQL and ML/MLOps experience.
Posted Apr 5, 2026
Create and verify original computational STEM/ML problems for GenAI training—contract, remote, ~10–20 hrs/week, paid hourly (up to $40/hr). Must have 5+ years ML experience, expert Python and SQL, strong statistics, and written English (C1+).
Posted Apr 5, 2026
Join OpenTrain AI as a remote, part-time contractor to evaluate and localize AI-generated Chinese (Simplified) and English content; requires 5+ years' localization/translation experience, native or near-native Chinese and C1 English, 20+ hours/week, paid $17–$23/hr.
Posted Apr 3, 2026
Join OpenTrain AI as a remote, contractor AI Safety LLM Trainer reviewing Korean and English model outputs for safety, policy alignment, and red-team testing; hourly pay $28–$38 and 20+ hours/week. Use senior Trust & Safety experience to rate, analyze, and improve model behavior with clear, reproduc
Posted Apr 3, 2026
Remote, part-time contract reviewing AI outputs for safety, correctness, and cultural nuance in Japanese and English; $27–$31/hr, 20+ hours/week. Use your Trust & Safety and red-teaming experience to shape safer AI behavior across languages.
Posted Apr 3, 2026
Join OpenTrain AI to evaluate and create Japanese-localized AI training content, testing models for accuracy, bias, and cultural fit. Fully remote contractor role paying $24–$31/hr (typical $28/hr); requires native or near-native Japanese and C1-level English.
Posted Apr 3, 2026
Join OpenTrain AI as a remote, part-time contractor reviewing and red-teaming LLM outputs in Hebrew and English to find safety failures and produce labeled evaluation data. $26–$38/hr, 20+ hours/week; your feedback will directly shape model safety.
Posted Apr 3, 2026
Join OpenTrain as a remote contractor to evaluate and red-team LLM outputs in French and English, focusing on safety, policy alignment, and adversarial case curation. This part-time role (20+ hrs/week) pays $24–$36/hr (typical $30/hr) and requires hands-on LLM red-teaming experience.
Posted Apr 3, 2026
Review and revise AI-generated French responses as a remote hourly contractor, rating outputs and producing corrected model answers; BA in linguistics/translation or a related field is required. Paid $16–$26.50/hr (typical $24/hr); worldwide and fully remote.
Posted Apr 3, 2026
Remote contractor role evaluating AI-generated content in English and Spanish; annotate safety, reasoning, and edge cases while red-teaming to detect risky outputs. Requires near-native Spanish, C1+ English, 5+ years in trust & safety or related fields, and LLM red-teaming experience.
Posted Apr 3, 2026
Join OpenTrain AI as a remote, part-time contractor to evaluate and label LLM outputs in Arabic and English, focusing on safety and adversarial behavior. This role requires 20+ hours/week and pays $15–$40/hr while you assess, annotate, and document unsafe or sensitive model responses.
Posted Apr 3, 2026
Join OpenTrain AI as a remote, part-time contractor reviewing and producing high-quality Arabic–English AI training content; requires a BA/BS, native Arabic, C1 English, and 3+ years of bilingual review or localization experience. 20+ hrs/week; pay $6–$12/hr.
Posted Apr 3, 2026
Use your biology training to evaluate and improve AI-generated biological answers in a remote contractor role. Requires a BS (or higher) from a top-100 university, strong biological reasoning, and C1-level written English; competitive hourly pay ($25–$55/hr).
Posted Apr 3, 2026
Join OpenTrain AI to review and create high-quality clinical and public-health content for AI models — remote, part-time contractor role (under 20 hrs/week) paying $25–$72/hr (posted $60/hr). Ideal for clinicians, nurses, and public-health professionals with strong clinical reasoning.
Posted Apr 2, 2026
Join OpenTrain AI to evaluate and improve AI-driven infrastructure automation: generate prompts, rate DevOps runbooks, and assess self-hosted platforms. Part-time contractor role requiring 2+ years DevOps experience, annotation/Q A skills, English B2+, 20+ hrs/week, $15–$45/hr.
Posted Mar 29, 2026
Train and evaluate AI on complex automation workflows using Make.com or n8n and custom JavaScript. Part-time contractor role (20+ hrs/week) for experienced low-code developers who can design production workflows, integrate APIs/webhooks, and perform rubric-based LLM evaluation and RLHF.
Posted Mar 29, 2026
Join OpenTrain AI to train and evaluate AI systems on API integration scenarios, working remotely 20+ hours/week with pay from $15–$45/hr. You will design prompts, review LLM-generated integration plans and payloads, and test robustness across REST APIs, webhooks, and SaaS connectors.
Posted Mar 29, 2026
Build and refine LLM-powered automation pipelines: design prompts, integrate APIs, evaluate model outputs, and improve reliability for content and outreach flows. Part-time contractor role (20+ hrs/week) paying $15–$45/hr; intermediate-level experience required.
Posted Mar 29, 2026
Build and evaluate advanced n8n automations to train AI systems on reliable, scalable workflows; contractor role, 20+ hrs/week, paid $15–$45/hr (USD). Ideal for engineers with self‑hosted n8n, Docker, API integration, and rubric-based evaluation experience.
Posted Mar 29, 2026
Use your Zapier/Make.com expertise to design, test, and evaluate no-code automations while training and reviewing AI outputs. Part-time contractor role (20+ hrs/week), English B2+, 2+ years with Zapier/Make; pay $15–$45/hr.
Posted Mar 29, 2026
Design computational, research-style quantitative finance problem sets and validate solutions in Python for AI training. Part-time contractor role (20+ hrs/week), pay per hour $15–$60, requires a degree, 2+ years quant experience, and strong Python skills.
Posted Mar 29, 2026
Design research-style computational statistics problems and produce fully reproducible Python solutions for use in AI training. Remote contractor role (20+ hrs/week) paying up to $60/hr USD; Bachelor's degree and 2+ years professional statistics experience required.
Posted Mar 29, 2026
Design and verify original, research-grade computational biology problems using Python and standard bioinformatics libraries. Part-time contractor role (20+ hrs/week) for candidates with a Biology degree and 2+ years' computational biology experience; pay varies by project up to $60/hr.
Posted Mar 29, 2026
PhD-level computational chemist needed to design research-grade problem sets that require advanced physical and quantum chemistry reasoning and Python-based validation. Part-time contractor work (20+ hrs/week) with hourly pay up to $60 and compensation tied to task complexity.
Posted Mar 29, 2026
Design original, research-style computational physics problems and deliver fully reproducible Python solutions for part-time, project-based work. Requires 2+ years research/teaching experience, advanced scientific Python skills, and strong written English — 20+ hrs/week, $15–$60/hr.
Posted Mar 29, 2026
Design original, research-style computational math problems and provide reproducible Python solutions for OpenTrain AI; 20+ hrs/week, contractor, $15–$60/hr. Requires a math degree, 2+ years relevant experience, and strong Python/NumPy/SciPy/SymPy skills.
Posted Mar 29, 2026
Write original computational mechanical-engineering problem sets and deliver fully reproducible Python solutions using NumPy, Pandas, and SciPy; part-time contractor role (20+ hrs/week) with pay up to $50/hr. CV in English required; some locations are restricted.
Posted Mar 29, 2026
Author and verify original electrical engineering computational problems using Python and scientific libraries for OpenTrain AI; part-time contractor role (<20 hrs/week) requiring an EE degree and 2+ years' professional or teaching experience.
Posted Mar 29, 2026
Design original civil/computational engineering problems and verify reproducible solutions using Python to create high-quality training data for generative models. Part-time contract (20+ hrs/week), up to $50/hr; requires a Civil Engineering degree, 2+ years relevant experience, and strong written E
Posted Mar 29, 2026
AI training is human work used to prepare and review examples for artificial-intelligence systems. Depending on the individual role, work open to applicants in Bulgaria can include 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. Read each live posting for its exact responsibilities and requirements.
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. The individual live posting is the source of truth for eligibility, responsibilities, qualifications, experience, pay, hours, schedule, location rules, and client-specific requirements.
