Looking for Machine Learning work that supports AI systems? 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 work uses Machine Learning subject-matter expertise in AI-training and data-labeling tasks, with the exact scope set by each live posting.
Apply your computational chemistry expertise to review simulations, electronic-structure methods, and cheminformatics pipelines used to train and validate chemistry-focused AI systems. Remote contract role, 20+ hrs/week, $40–$60/hr.
Posted Jul 7, 2026
Join OpenTrain as a remote, part-time Computer Science AI Training Specialist to author and evaluate technical examples that teach AI systems; contractor work at $20–$40/hr for 20+ hours/week. Ideal for CS graduates with strong writing and domain expertise in algorithms, systems, databases, networki
Posted Jul 3, 2026
Seeking a remote Physics PhD to create, review, and evaluate advanced physics problem sets and model outputs for AI training; part-time contract (~20 hrs/week) paying $80–$90/hr for 1–3 months. Work focuses on text tasks: question answering, text generation, and evaluation.
Posted Jun 30, 2026
OpenTrain AI seeks an adversarial ML / red-team specialist to design safety tests, stress-test LLMs for prompt-injection and tool-use abuse, and build regression suites. Part-time contractor role (remote, 20+ hrs/week) paying USD $50–$90/hr.
Posted Jun 30, 2026
Join OpenTrain AI to label humanoid robotics video for VLA models as a Level B annotator — 20+ hrs/week, contractor, paid USD $6/hr (range $5–$8); Encord experience preferred but other platform experience is accepted.
Posted Jun 27, 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, 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 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
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 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
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
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
Join OpenTrain to build a supervised fine-tuning dataset and run QLoRA on Qwen3-Coder for JUCE/C++ audio DSP. This contract role requires expert JUCE/DSP experience to extract code from 40+ repos, craft 3,000–5,000 ChatML examples, and fine-tune with Unsloth.
Posted Feb 27, 2026
Design structured evaluation scenarios and gold-standard behaviors for LLM-based agents in a remote, part-time contractor role (20+ hrs/week). Pay $18–$24/hr; requires QA-style thinking, basic Python/JavaScript, and strong written English.
Posted Jan 13, 2026
Design and implement realistic, end-to-end data science problems used to train and evaluate advanced AI systems. Senior quantitative candidates with 5+ years of hands-on data science, expert Python and strong SQL skills, paid $50/hr as a part-time contractor.
Posted Dec 3, 2025
Join OpenTrain AI to red-team large language models and agents, building reproducible attack tests, automation, and security tooling. Part-time remote work for certified cybersecurity professionals with strong scripting and pentesting experience, flexible hours, pay up to $55/hr.
Posted Nov 17, 2025
Join OpenTrain AI to label buttons and icons in product photos using bounding boxes and polygons; this entry-level, remote contractor role pays $0.05 per labeled item. Work on small batches of images in Label Studio — flexible, part-time work that helps train real machine-learning systems.
Posted Oct 27, 2025
Evaluate AI-generated biology responses for correctness, experimental design, and reasoning depth. PhD in Biology required; $80/hr, minimum 17–20 hrs/week, paid onboarding exams, contractor part-time role with remote work worldwide.
Posted Oct 24, 2025
Evaluate and rate AI-generated mathematical solutions, author exemplar step-by-step answers, and catch subtle conceptual or computational errors; $80/hr, contractor part-time role requiring a BS/MS/PhD in mathematics from a top-100 university and 17–20 hrs/week minimum.
Posted Oct 24, 2025
Part-time, remote contractor role ($40/hr) designing and running adversarial LLM evaluations and RAG pentests. Requires pentesting experience, Python/Bash/PowerShell skills, container/CI-CD security knowledge, C1 English, and immediate HackerRank + platform assessment.
Posted Oct 6, 2025
Join OpenTrain to audit and improve LLM prompts and model answers on vehicle systems—verify calculations, rate against rubrics, and draft better solutions. Part-time contractor role, $40/hr, under 20 hours/week; requires 3+ years in automotive engineering and practical Python.
Posted Oct 1, 2025
Build and own the infrastructure that powers LLM training and agent evaluation at OpenTrain AI; remote for US & Canada, 20+ hours/week, contractor roles with hourly pay tiers (Junior $34 / Middle $37 / Senior $42). Shortlisted candidates complete a timed HackerRank and platform coding test.
Posted Jul 25, 2025
Join OpenTrain AI to build the Python infrastructure that powers LLM training and agent evaluation. Fully remote for Asia‑Low region, 20+ hrs/week contract work with tiered hourly pay; requires 5+ years Python, Docker, CI/CD, FastAPI/Flask, and Linux expertise.
Posted Jul 25, 2025
Join OpenTrain AI as a part-time Senior Python Code Reviewer to audit AI-generated Python snippets in containerized sandboxes; $18/hr, remote, under 20 hrs/week. Bring 7+ years of Python experience and mandatory Docker proficiency to validate correctness, security, and guideline compliance.
Posted Jul 7, 2025
Machine Learning expertise may be applied to preparing or reviewing examples for artificial-intelligence systems. Depending on the individual assignment, that can include writing or rating model responses, evaluating search results, reviewing code, annotating images or video, transcribing or recording audio, or translating text. The individual posting defines which activities apply and what the project asks you to do, so read it before deciding whether to explore a role.
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. Hiring, eligibility, responsibilities, and other requirements are specific to each role, so use the individual live posting as the source for those details.
