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Remote AI training and data labeling jobs in Bulgaria

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.

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

Portuguese AI Personalization Quality Analyst

Join OpenTrain as a Portuguese AI Personalization Quality Analyst evaluating personalized generative responses using your own conversation context — remote, contractor, 20+ hrs/week at $15/hr. Create multi-turn prompts, compare model outputs, and write precise rationales to improve grounding and hel

Generative AI & RLHF
Text
Remote · Worldwide
Portuguese
Part-time · Flexible
Intermediate level
Hourly · $15/hr

Posted Jul 16, 2026

Russian Language AI Analyst

Work remotely as a bilingual (Russian/English) AI analyst creating summaries, validating claims, and solving analytical puzzles to improve large language models; entry-level, 20+ hours/week, contractor/part-time work through OpenTrain.

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

Posted Jul 16, 2026

Finnish Language AI Training Analyst

Join OpenTrain AI as a Finnish-language analyst helping fine-tune LLM reasoning: read and deconstruct Finnish text, verify facts via web research, and create analytical training scenarios. Remote, contractor role for a short-term 1-month assignment with up to 40 hrs/week and US Pacific overlap.

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

Posted Jul 16, 2026

Finance Model Evaluation Expert

Join OpenTrain AI to evaluate LLM outputs in finance, design rubrics, and help shape model training and benchmarks. Part-time contractor role (<20 hrs/week), remote worldwide, paying $100/hr for finance professionals with 2+ years' experience.

Generative AI & RLHF
Text
Remote · Worldwide
English
Part-time · Flexible
Entry level
Hourly · $100/hr

Posted Jul 16, 2026

Software Engineering Code Evaluator

Evaluate and improve AI-generated code while creating benchmarking datasets for advanced software engineering models. This expert, remote contract role is part time at less than 20 hours per week.

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

Posted Jul 16, 2026

LLM Evaluation & Repository Validation Engineer

Evaluate real software repositories and help measure how well AI coding systems fix bugs. This remote, three-month contractor assignment offers 20 hours per week for engineers skilled in codebases, testing, Git, and Docker.

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

Posted Jul 16, 2026

Advanced Math Research Analyst, Remote Contractor

Join OpenTrain to train large language models by solving, researching, and writing clear step-by-step math and logic explanations; remote contractor role with a minimum 20 hours/week and a 1-month contract. Ideal for strong math communicators who enjoy structured problem solving.

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

Posted Jul 16, 2026

Senior Python Developer for AI Model Evaluation

Use advanced Python skills to evaluate AI models, create training data, rank responses, and improve coding-focused systems. This worldwide contract role offers flexible part-time work of 20+ hours per week.

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

Posted Jul 16, 2026

Python AI Model Training & Evaluation Engineer

Build and evaluate AI systems through Python development, supervised fine-tuning, RLHF, response ranking, and public-data analysis. This fully remote contractor role offers 20, 30, or 40 hours per week for a one-month engagement.

Coding & Software
Text
Remote · Worldwide
English
Part-time · Flexible
Entry level

Posted Jul 16, 2026

Pro Bono Civil Legal AI Reviewer

Join OpenTrain AI to evaluate AI-generated civil legal analyses focused on housing, family, consumer, foreclosure, and debt matters; provide structured written feedback to improve legal AI reasoning. Remote contract role for U.S.-bar attorneys, 20+ hours/week at $170/hr.

Legal & Finance
Text
Remote · Worldwide
English
Part-time · Flexible
Entry level
Hourly · $170/hr

Posted Jul 16, 2026

Funds Contract Redlining Attorney

Join OpenTrain as a remote Funds Contract Redlining Attorney to train and evaluate legal AI by running redlines, simulated negotiations, and grading model outputs. Part-time contractor role (20+ hrs/week) paying $90–$130/hr; J.D. and active U.S. bar required.

Legal & Finance
Text
Remote · Worldwide
English
Part-time · Flexible
Intermediate level
Hourly · $90–$130/hr

Posted Jul 16, 2026

AI Evaluation Analyst, LLM Conversation & Rubric Authoring

Create multi-turn conversations, rubrics, and evaluation assets for frontier LLMs while working remotely as a contractor 20+ hours/week. Rapid onboarding and clear specs; paid on a per-task/hour basis at $20–$30/hr.

Generative AI & RLHF
Text
Remote · Worldwide
English
Part-time · Flexible
Entry level
Hourly · $20–$30/hr

Posted Jul 16, 2026

LLM Red-Teamer for Adversarial Testing and Evaluation

Join OpenTrain as a remote LLM Red-Teamer to design adversarial multi-turn conversations, write rigorous evaluation rubrics, and validate frontier language models 20+ hrs/week for $40–$65/hr. Prior RLHF or evaluation experience is helpful but not required.

Generative AI & RLHF
Text
Remote · Worldwide
English
Part-time · Flexible
Entry level
Hourly · $40–$65/hr

Posted Jul 16, 2026

Hindi Audio Engineer (Remote, Part-Time)

OpenTrain is hiring a Hindi Audio Engineer to edit, mix, master and quality-review Hindi audio for AI training projects; flexible contractor work under 20 hrs/week, paid $20–$30/hr. Native or near-native Hindi required.

Audio & Speech
Audio
Remote · Worldwide
Hindi
Part-time · Flexible
Entry level
Hourly · $20–$30/hr

Posted Jul 16, 2026

Spanish (Mexico) Voice Actor, Remote Recording

Record expressive Spanish (Mexico) voice performances for AI training, delivering production-ready audio from your home studio; paid up to $65/hr for 20+ hours/week. Join OpenTrain to help shape how speech AI understands tone, emotion, and natural conversation.

Audio & Speech
Audio
Remote · Worldwide
Spanish
Part-time · Flexible
Intermediate level
Hourly · $20–$65/hr

Posted Jul 16, 2026

Video Content Data Labeling Associate

Join OpenTrain as a part-time Video Content Data Labeling Associate to annotate short first-person household-task videos (classification and object detection). Entry-level friendly, remote worldwide, $10–$12/hr for 20+ hours/week.

Image & Video Annotation
Video
Remote · Worldwide
English
Part-time · Flexible
Entry level
Hourly · $10–$12/hr

Posted Jul 16, 2026

AI Quality Analyst, Portuguese (Portugal)

Join OpenTrain as a part-time AI Quality Analyst evaluating a conversational AI personalization feature; Portuguese fluency required. Remote, contractor work at $15/hr with a 20+ hour weekly commitment—you'll design personal prompts, compare side-by-side responses, and write defensible rationales.

Generative AI & RLHF
Text
Remote · Worldwide
Portuguese
Part-time · Flexible
Intermediate level
Hourly · $15/hr

Posted Jul 15, 2026

Finance AI Model Evaluator

Evaluate and improve large language models on real finance tasks — capital markets, trading, M&A, accounting and more. Contract, part-time role (20+ hrs/week) paid $100/hr; English required and open worldwide through OpenTrain.

Generative AI & RLHF
Text
Remote · Worldwide
English
Part-time · Flexible
Entry level
Hourly · $100/hr

Posted Jul 15, 2026

AI Quality Analyst, Personalization (German)

Evaluate a new personalization feature for a conversational AI in German: design multi-turn prompts, compare side-by-side responses, and write clear rationales. Contractor role, $15/hr, 3-month engagement, remote with required PST overlap.

Generative AI & RLHF
Text
Remote · Worldwide
German
Part-time · Flexible
Entry level
Hourly · $15/hr

Posted Jul 15, 2026

English LLM Evaluation Generalist

Join OpenTrain to evaluate large language model outputs, create challenging prompts, and deliver recorded verbal feedback; remote, contract role (20+ hrs/week) paying $20–$30/hr. Entry-level friendly for strong American English speakers with LLM experience.

Generative AI & RLHF
Text
Remote · Worldwide
English
Part-time · Flexible
Entry level
Hourly · $20–$30/hr

Posted Jul 15, 2026

Economics AI Training Expert

Join OpenTrain as a remote Economics Expert to create benchmark-quality economics responses, review advanced solutions, and document rationales for AI training—PhD required; $80–90/hr, 20+ hours/week, contract part-time.

Generative AI & RLHF
Text
Remote · Worldwide
English
Part-time · Flexible
Entry level
Hourly · $80–$90/hr

Posted Jul 15, 2026

Computer Science Expert - Golden Responses & Review

Join OpenTrain as a contractor producing authoritative computer‑science answers, creating golden responses, and reviewing technical solutions to improve AI. PhD required; 20+ hours/week; $80–$90/hr; fully remote and open worldwide (English).

Generative AI & RLHF
Text
Remote · Worldwide
English
Part-time · Flexible
Entry level
Hourly · $80–$90/hr

Posted Jul 15, 2026

Biology AI Training Expert (PhD, Remote, $80–90/hr)

Bring your PhD in biology to improve AI systems: review and refine biology prompts, scenarios, and model outputs on a part-time, remote contract at $80–90/hr. Work <20 hrs/week on text-based evaluation and generation tasks with OpenTrain AI.

Generative AI & RLHF
Text
Remote · Worldwide
English
Part-time · Flexible
Entry level
Hourly · $80–$90/hr

Posted Jul 15, 2026

Physics AI Training Specialist, Remote Contract

Join OpenTrain as a remote Physics AI Training Specialist (contract, <20 hrs/week) to create and review advanced physics content that improves AI reasoning; requires a PhD in Physics and pays $80–$90/hr. Work focuses on text-based generation and evaluation tasks.

Generative AI & RLHF
Text
Remote · Worldwide
English
Part-time · Flexible
Entry level
Hourly · $80–$90/hr

Posted Jul 15, 2026

Math Expert (PhD), Advanced Math Responses

Join OpenTrain as a contracted Math Expert (PhD) creating and refining precise model answers for advanced undergraduate and graduate math prompts. Part-time remote work, 20+ hours/week at $80–$90/hr; English required.

Generative AI & RLHF
Text
Remote · Worldwide
English
Part-time · Flexible
Entry level
Hourly · $80–$90/hr

Posted Jul 15, 2026

Statistics Expert (PhD), Remote AI Training Consultant

Use your PhD-level statistics expertise to write, review, and explain model responses that teach AI systems; part-time remote contract paying $90–$120/hr for an estimated 1–3 month project with flexible hours.

Generative AI & RLHF
Text
Remote · Worldwide
English
Part-time · Flexible
Entry level
Hourly · $90–$120/hr

Posted Jul 15, 2026

Chemistry PhD AI Training Reviewer

Join OpenTrain as a remote Chemistry AI Training Reviewer to write and rate advanced chemistry responses, create golden-reference answers, and improve model behavior — part-time contract paying $80–$90/hr for an estimated 1–3 month engagement.

Generative AI & RLHF
Text
Remote · Worldwide
English
Part-time · Flexible
Entry level
Hourly · $80–$90/hr

Posted Jul 15, 2026

German Voice AI Data Rater

Record, transcribe, and rate German voice interactions for a next‑generation AI assistant on your Mac; $38/hr, 20+ hours/week, fully remote and contractor-friendly. Ideal for native German speakers with strong transcription attention to detail.

Audio & Speech
Audio
Remote · Worldwide
German
Part-time · Flexible
Entry level
Hourly · $38/hr

Posted Jul 14, 2026

Management Consulting AI Evaluation Expert

Design grading rubrics and score AI and human consulting deliverables with evidence-based written justifications. Remote contractor role, 20+ hours/week, pay $150–$220/hr working for OpenTrain AI on evaluation and quality tasks.

Generative AI & RLHF
Text
Remote · Worldwide
English
Part-time · Flexible
Entry level
Hourly · $150–$220/hr

Posted Jul 14, 2026

Mechanical Engineering Assessment Writer

Create graduate-level multiple-choice questions and exam-quality rationales, review AI-generated mechanical engineering content, and help ensure technical accuracy; contract, remote role paying $60–$130/hr for ~20+ hours/week.

Writing & Editing
Text
Remote · Worldwide
English
Part-time · Flexible
Entry level
Hourly · $60–$130/hr

Posted Jul 14, 2026

What this work can involve

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.

  • Possible work may include labeling visual data, reviewing written responses, or evaluating search results.
  • Individual postings may define language, translation, audio, coding, or subject-matter tasks.

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. The individual live posting is the source of truth for eligibility, responsibilities, qualifications, experience, pay, hours, schedule, location rules, and client-specific requirements.

  • Review each posting for its rules about applicants located in Bulgaria.
  • Use the individual live posting for every role-specific detail.

Frequently asked questions

What can this work involve?
AI training work involves preparing or reviewing examples used by artificial-intelligence systems. Depending on the individual posting, it can include data labeling, image or video annotation, audio transcription or recording, writing or rating responses, search-result evaluation, translation, code review, or applying subject-matter knowledge. Each role defines its own responsibilities.
Where can I find role-specific details?
The individual live posting is the only source of truth for eligibility, responsibilities, qualifications, experience, pay, hours, schedule, location rules, and client-specific requirements. Review the posting for the role’s details and any conditions applying to applicants located in Bulgaria.
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 live posting for all other information about the role.