Looking for Computer Science work supporting the development of AI systems? OpenTrain is the hiring organization for roles presented on OpenTrain, and candidates apply through OpenTrain. OpenTrain may place or refer successful candidates to the client whose project they will support.
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 as a remote, part-time contractor reviewing AI-generated Python solutions and Chinese-language explanations; $27–$50/hr, 20+ hrs/week. Use your Python code-review skills and bilingual fluency to rate, correct, and author reference solutions that improve model behavior.
Posted Jul 24, 2026
Help evaluate AI software-engineering models by building reinforcement learning environments, deterministic tests, and reference solutions. This worldwide, part-time contractor role pays $80–$120 per hour and requires strong software engineering skills.
Posted Jul 23, 2026
Build reproducible reinforcement learning environments that test how AI systems solve real-world coding problems. This remote contractor role offers flexible work of approximately 15 hours per week at $50–$100 per hour.
Posted Jul 22, 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 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
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
Review and validate AI-produced C++ code for correctness, efficiency, and reliability in a remote, contractor role. Ideal for intermediate C/C++ engineers who can spend 20+ hours/week giving clear, actionable feedback to improve generated software.
Posted Jul 17, 2026
Join OpenTrain as a remote Performance Engineer focused on systems-level optimization, compiler engineering, and runtime performance for AI training data. This contract role pays $70–$110/hr and requires reliable full-time work (40 hours/week) from US-based contributors fluent in English.
Posted Jul 17, 2026
Help train frontier AI systems by designing and evaluating advanced MLOps and ML systems tasks. Apply your production expertise in JAX, PyTorch, distributed systems, and GPU kernel optimization to remote work paying $70–$110 per hour.
Posted Jul 17, 2026
Join OpenTrain AI to review and validate AI-generated Go code for dialog-agent backends in a part-time, remote contractor role (20+ hrs/week). Use your Go expertise and engineering judgment to ensure correct, efficient, and dependable implementations.
Posted Jul 17, 2026
Join OpenTrain AI to build evaluation datasets from public open-source code and measure how LLMs handle real-world software tasks; requires 3+ years software engineering with strong Go skills, 20+ hours/week, and eligibility in select countries.
Posted Jul 17, 2026
Join OpenTrain as a remote contractor building and evaluating LLM performance on real C++ codebases; flexible 20/30/40 hr/week schedules and opportunities to lead junior engineers. Work with researchers to design verifiable engineering tasks, triage issues, run code, and rate model outputs.
Posted Jul 17, 2026
Join OpenTrain as a contractor designing and validating data pipelines and benchmark evaluation tasks for AI systems. Work part-time (20+ hrs/wk) with Python on production-like datasets; applicants need 3+ years in data engineering, data science, or data-focused software engineering.
Posted Jul 16, 2026
Write realistic multi-turn conversations that teach assistants when and how to call tools, modeling calendars, email, maps, and other app workflows. Part-time contractor role requiring 20+ hrs/week and 3+ years technical or analytical experience; open to applicants in specified countries.
Posted Jul 16, 2026
Evaluate and improve AI-generated code while building verification systems for cutting-edge language models. This flexible contractor role is open to software engineers in the US, Canada, and select Western European countries.
Posted Jul 16, 2026
Evaluate real Rust repositories and GitHub issues to help measure how LLMs solve software bugs. This part-time contractor role offers 20+ hours per week for engineers experienced with Rust, Git, Docker, and local testing.
Posted Jul 16, 2026
Help evaluate how AI models solve real-world software bugs by triaging GitHub issues, configuring repositories, and testing Python codebases. This part-time contractor role requires 20+ hours per week and is open in select countries.
Posted Jul 16, 2026
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.
Posted Jul 16, 2026
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.
Posted Jul 16, 2026
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).
Posted Jul 15, 2026
Join OpenTrain to implement C++ checker solutions during a live competitive programming contest — $45–$65/hr, 20+ hrs/week, one-time live participation with estimated project earnings of $7,200–$10,400. Remote, contractor-friendly role for skilled C++ competitive programmers.
Posted Jul 11, 2026
Build C++ checkers and test suites that validate complex competitive-programming submissions for next-generation AI training. Remote, contract role for strong competitive programmers who can design problems, write reference solutions, and document edge-case logic.
Posted Jul 11, 2026
Design RL environments that test AI models on original competitive programming problems by building C++ checkers, reference solutions, and robust test suites. Remote, part-time contractor role (20+ hrs/week) paying $45–$65/hr for English speakers worldwide.
Posted Jul 11, 2026
Join OpenTrain as a remote Software Engineer Code Reviewer working 20+ hrs/week to write, review, and rate Go, Python, and TypeScript code to train and evaluate AI systems. Competitive contractor pay ($100–$130/hr) and flexible scheduling.
Posted Jul 10, 2026
Build pixel-perfect responsive web components from design screenshots and style guides using TypeScript and CSS3 in a remote contract role. 20+ hrs/week, $40–50/hr; strong English communication and ability to work independently required.
Posted Jul 9, 2026
Join OpenTrain as an iOS Code Review and AI Training Engineer: review AI-generated iOS code, write reference answers, and rate model responses. Contract role, $110/hr, 20+ hours/week, remote (listed countries), English required.
Posted Jul 9, 2026
Review AI-generated Vue and Nuxt code, rate model responses, and create high-quality reference implementations to teach models best frontend practices. Remote contract, ~20 hours/week for ~8 weeks, country-specific pay up to $90/hr.
Posted Jul 9, 2026
Lead QA for AI-generated TypeScript code: review implementations, provide precise written feedback, maintain quality workflows, and support onboarding. Remote contractor role for US-based contributors — up to $70/hour, 20+ hours/week.
Posted Jul 9, 2026
Computer Science subject-matter work in AI training can involve reviewing or writing code, judging the quality of technical model responses, evaluating search results, labeling data, or applying computing knowledge to other examples used to prepare and assess AI systems. The exact responsibilities depend on the project. Read each individual live posting carefully for its stated scope, qualifications, eligibility, pay, hours, schedule, location rules, and client-specific requirements.
OpenTrain is the hiring organization for the public roles on OpenTrain. Candidates apply through OpenTrain, and successful candidates may be placed with or referred to the client whose project they will support. Hiring details are specific to each live posting, so review the relevant listing for the requirements and terms attached to that opportunity.
