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.
Design and deploy multi-step AI agent systems for advanced mathematical reasoning using Python, LLM orchestration, structured outputs, and tool integration. This remote four-week contractor assignment includes 40 hours per week and PST overlap.
Posted Sep 7, 2026
Build and deploy agentic AI systems for high-impact U.S. Government missions, from prototype through production. This expert contractor role requires strong Python, LLM, data pipeline, and ML infrastructure experience, with a commitment of at least 20 hours weekly for 6+ months.
Posted Sep 7, 2026
Join a remote contractor project helping improve next-generation AI through data annotation, question answering, and English-language output evaluation. Earn $50-$90 per hour while applying critical thinking and careful judgment.
Posted Sep 5, 2026
Review robotic-arm footage, identify key actions, and create accurate video annotations that support machine learning and AI training. This remote contractor role pays $50-$90 per hour and runs an expected 3 to 6 months.
Posted Sep 5, 2026
Build and operate GPU infrastructure and production LLM serving systems on Google Cloud Platform. This remote, two-month contractor role includes an 8-hour daily commitment and Pacific Time overlap.
Posted Sep 4, 2026
Audit applied machine-learning tasks for sound experiment design, reliable evaluation, and evidence-backed conclusions. This remote US contractor role pays $70-$90 per hour and requires 20+ hours weekly.
Posted Sep 1, 2026
Evaluate Python coding agents by reviewing trajectories, tool use, code changes, execution results, and final outputs. This remote contractor role offers 20+ hours per week for experienced software engineers with AI or LLM expertise.
Posted Aug 30, 2026
Use your Python engineering expertise to evaluate next-generation coding agents, review complete trajectories, debug generated code, and assess tool use and execution results. Work remotely as a part-time contractor for 20+ hours per week.
Posted Aug 30, 2026
Join a 3- to 6-month remote project as a Video Annotation Expert, reviewing action and hand-pose data to improve next-generation AI systems. Earn $15-$20 per hour as a contractor.
Posted Aug 29, 2026
Conduct structured interviews with senior technical experts in GPU kernels, security research, and ML compilers. This remote U.S. contract role pays $50-$60 per hour for about 10 weekday hours per week.
Posted Aug 28, 2026
Help evaluate NKI kernel development for advanced AI training, focusing on CUDA migration, Trainium performance, and numerical correctness. This US contract offers 20+ hours per week at $70-$90 per hour.
Posted Aug 28, 2026
Use your data science, statistics, and quantitative expertise to evaluate AI model reasoning, create expert prompts and reference solutions, and improve next-generation systems. This remote contractor role offers $245-$280 per hour and requires 20+ hours weekly.
Posted Aug 27, 2026
Build production software around pre-release large language models, create evaluation tools, and turn technical findings into clear feedback. This remote India engagement pays $25-$30 per hour and requires 20+ hours weekly.
Posted Aug 19, 2026
Evaluate next-generation AI coding agents by reviewing their workflows, debugging Python outputs, and validating technical results. This remote contractual role requires expert Python engineering experience and practical experience building or using LLM-powered agents.
Posted Aug 15, 2026
Evaluate English speech recordings and create accurate annotations that help speech-recognition systems understand pronunciation, intent, and accents. This flexible remote contract offers under 20 hours per week for an expected 3 to 6 months.
Posted Aug 7, 2026
Help shape next-generation AI by building reinforcement learning environments that evaluate coding agents on debugging, feature development, refactoring, and optimization. This worldwide, part-time contract offers flexible work for experienced software engineers.
Posted Aug 5, 2026
Use data science, statistics, and technical writing expertise to evaluate and improve AI-generated content and data. This remote, part-time contractor role offers 20+ hours per week and $100 to $200 per hour.
Posted Aug 4, 2026
Build and optimize production machine learning solutions in a remote contractor role with OpenTrain. Work 20, 30, or 40 hours weekly across data pipelines, modeling, deployment, and monitoring.
Posted Aug 2, 2026
Test conversational AI models and agents for jailbreaks, prompt injections, bias exploitation, and other safety risks. This expert-level remote contract pays $48 to $62 per hour for 20+ hours weekly.
Posted Jul 30, 2026
Probe conversational AI for jailbreaks, prompt injections, bias exploitation, and manipulation as an expert red team contractor. Work worldwide for $48 to $62 per hour, 20+ hours weekly, using English and Danish.
Posted Jul 30, 2026
Help improve conversational AI by uncovering jailbreaks, prompt injections, bias risks, and other vulnerabilities. This remote contractor role offers 20+ hours per week at $29-$45 per hour for native English and Portuguese speakers.
Posted Jul 30, 2026
Test conversational AI for jailbreaks, prompt injections, bias, misuse, and multi-turn manipulation. This expert contract role offers 20+ hours weekly at $48-$62 per hour for native English and Dutch speakers.
Posted Jul 30, 2026
Probe conversational AI with jailbreaks, prompt injections, and bias tests while documenting vulnerabilities and systemic risks. This remote expert contract requires native English and Malay fluency and offers $17 to $25 per hour.
Posted Jul 30, 2026
Build and optimize GPU software for LLM training tasks using CUDA, WebGPU, GLSL, and C++. This expert-level contractor role offers worldwide remote work at $60 to $85 per hour for 20+ hours weekly.
Posted Jul 29, 2026
Evaluate AI-generated and human-created data science work remotely at $100 to $150 per hour. Create grading criteria, assess complex deliverables, and provide evidence-based feedback through a flexible contractor role.
Posted Jul 29, 2026
Develop reproducible reinforcement learning environments that test complex software engineering workflows, create golden solutions, and contribute to open-source code. This worldwide contract role offers $50 to $150 per hour and requires 20+ hours weekly.
Posted Jul 20, 2026
Build Java backend components and evaluate large language model responses for relevance, clarity, accuracy, and safety. This worldwide, part-time contractor role offers 20+ hours per week for engineers interested in shaping AI.
Posted Jul 17, 2026
Use Python and full-stack JavaScript to evaluate AI models, build fine-tuning datasets, and improve responses through RLHF. This flexible, worldwide contractor role requires 20+ hours weekly and strong technical English.
Posted Jul 17, 2026
Join OpenTrain as a Machine Learning Engineer evaluating real-world ML systems through benchmark-driven coding tasks. Work remotely on training, inference, debugging, and model evaluation for at least 20 hours per week.
Posted Jul 16, 2026
Build and validate Python data pipelines and benchmark tasks for advanced AI systems in a flexible, 3-month contractor role with 20+ hours per week.
Posted Jul 16, 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.
