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.
Evaluate next-generation AI coding agents by reviewing coding trajectories, debugging Python outputs, and validating technical results. This fully remote, one-month contract requires senior Python engineering experience and practical LLM or agent development expertise.
Posted Aug 15, 2026
Probe large language models for subtle failures, create rigorous benchmark tasks, and help researchers improve frontier AI evaluations. This fully remote U.S. role pays $60–$90 per hour and expects about 35 hours weekly.
Posted Aug 8, 2026
Design enterprise-grade data science scenarios, reference analyses, and evaluation rubrics that teach AI to reason like a senior data leader. This fully remote freelance contract pays $60–$70 per hour for a 40-hour weekly commitment.
Posted Aug 7, 2026
Build reinforcement learning environments that evaluate how AI models solve real software engineering tasks. Work remotely on reproducible coding challenges, MCP tool interactions, and deterministic model verification for $100–$150 per hour.
Posted Aug 5, 2026
Create competitive programming problems, reinforcement learning environments, reference solutions, and C++ checkers that challenge AI models. This flexible remote contract pays $45–$65 per hour for approximately 1–3 months.
Posted Aug 4, 2026
Use your data science expertise to evaluate, fact-check, and improve AI-generated content and analytical outputs. This remote, part-time contractor role offers $100–$200 per hour and requires 20+ hours weekly.
Posted Aug 4, 2026
Build and optimize production machine learning systems in Python across data pipelines, modeling, deployment, and monitoring. This remote contractor assignment offers 20, 30, or 40 hours per week for candidates in nine eligible countries.
Posted Aug 2, 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
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 an expert AI Safety Red Teaming Specialist to probe conversational models for jailbreaks, prompt injections, and misuse; contractor, 20+ hrs/week, $48–$62/hr, remote, requires native English and Norwegian fluency.
Posted Jul 30, 2026
OpenTrain is hiring an expert AI Safety Red Team Specialist to perform text-based adversarial testing of conversational models (20+ hrs/week). Earn $48–$62/hr while finding jailbreaks, prompt injections, and systemic failure cases; native English and Finnish required.
Posted Jul 30, 2026
Join OpenTrain to red team conversational AI—find jailbreaks, prompt injections, and multi-turn manipulation, and produce reproducible vulnerability reports; remote, contract, 20+ hrs/week, $48–$62/hr. Native English and Danish required.
Posted Jul 30, 2026
Probe conversational AI for jailbreaks, prompt injections, and misuse as a remote AI Safety Red Team Specialist for OpenTrain. Contractor, part-time role (20+ hrs/week) paying $24–$35/hr; native English and Thai required.
Posted Jul 30, 2026
Join OpenTrain as an AI Safety Red Team Expert to probe conversational AI with adversarial prompts, jailbreaks, and structured red‑team methods. Remote, contract, 20+ hrs/week, pay $29–$45/hr; native English and Portuguese required.
Posted Jul 30, 2026
Join OpenTrain AI to red-team conversational models—finding jailbreaks, prompt injections, bias, and misuse—while producing reproducible attack cases and risk reports. Contract, part-time role (20+ hrs/week) paying USD 17–25/hr; native English and Indonesian required.
Posted Jul 30, 2026
Join OpenTrain to perform adversarial, text-based red teaming on conversational AI—find jailbreaks, annotate failures, and produce reproducible attack cases. Remote contractor role paying $17–$25/hr that requires native English and Vietnamese and a background in red teaming or cybersecurity.
Posted Jul 30, 2026
Join OpenTrain AI as an expert red teamer probing conversational models for jailbreaks, prompt injection, bias exploitation, and multi-turn manipulation; remote contractor role, 20+ hrs/week, $48–$62/hr, native English and Dutch required.
Posted Jul 30, 2026
Design and author multi-step scientific evaluation tasks for frontier AI models in a full-time remote US contractor role paying $60–$90/hr. Expect ~35 hours/week building Python reference solutions, defining rigorous criteria, and reviewing model attempts.
Posted Jul 29, 2026
Evaluate and improve agentic coding models by reviewing agent trajectories, verifying outputs, and designing rubrics on a 5-week remote contract. Requires 5+ years of hands-on software experience and daily overlap with PST.
Posted Jul 29, 2026
Expert contractor role to design and optimize GPU software for LLM training (CUDA/WebGPU/GLSL). Remote, 20+ hrs/week, $60–$85/hr; requires advanced GPU programming and strong C++ for host-side integrations.
Posted Jul 29, 2026
Join OpenTrain as an ML Researcher Evaluation Specialist to assess frontier machine-learning researchers and their publication records for a high-priority pilot; part-time contractor role (20+ hrs/week), remote worldwide, paid $60–$100 USD/hr.
Posted Jul 29, 2026
Join OpenTrain as a part-time contractor to design reinforcement-learning code environments and expert reference solutions that teach AI to code, debug, refactor, and optimize — paid $50–$150/hr. Remote role with flexible hours; apply with a strong GitHub/GitLab record.
Posted Jul 29, 2026
Assess AI-generated reproductions of published ML papers: read papers, inspect code/data/output artifacts, rank reproduction attempts, and provide clear written evaluations. Remote, contractor role for experienced ML researchers — 20+ hrs/week.
Posted Jul 25, 2026
Join OpenTrain AI as a Machine Learning Engineer to design and run evaluation benchmarks for frontier LLMs. Contract, part-time role (20+ hrs/week) paying $60–$90/hr for US-based practitioners with hands-on ML training and research experience.
Posted Jul 25, 2026
Join OpenTrain to build and evaluate RL training environments that teach AI systems how to operate cloud infrastructure. Remote contractor role, worldwide, 20+ hrs/week (see schedule), paying $60–$130/hr with estimated project earnings of $9,600–$20,800.
Posted Jul 22, 2026
Join OpenTrain as a Human Data Manager to design and run annotation and data workflows, track KPIs, and improve dataset quality for AI training. Part-time contractor role, remote, paying $40–$60/hr with flexible hours (20+ hrs/week).
Posted Jul 21, 2026
Join OpenTrain as an RL Environment Developer building reproducible reinforcement-learning environments that test AI models on complex software engineering workflows; contract, remote, 20+ hrs/week, $50–$150/hr based on experience.
Posted Jul 20, 2026
Evaluate a personalization feature in Polish by designing short multi-turn prompts, comparing paired model responses, and writing concise, defensible quality rationales. Contractor role, $20/hr, remote, ~4 hours/day with 4-hour overlap with PST for a 1-month engagement.
Posted Jul 20, 2026
Join OpenTrain as a remote contractor to evaluate LLM performance on real open-source codebases using Ruby, Git, and Docker. This part-time role requires at least 20 hours/week, a 4-hour PST overlap, and candidates based in specified countries.
Posted Jul 20, 2026
Join OpenTrain AI to design, solve, and evaluate challenging mathematics problems that probe LLM reasoning limits; this remote, part-time contractor role expects 20+ hours/week, advanced graduate-level math knowledge, Python ability, and English fluency.
Posted Jul 20, 2026
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.
