AI Workflow Engineer (LLM Integration & Prompt Engineering)

About OpenTrainOpenTrain is the #1 platform for finding and building careers in AI training and data labeling. The platform helps people start and grow careers teaching AI — discover projects, build a profile, and apply in minutes. Creating an OpenTrain account is free. Work with real-world AI training projects that shape how models behave.Flexible, remote work that fits around studies, other jobs, or family commitments.About AI Training WorkAI training (also called data labeling or human feedback work) is the human side of building modern AI: people annotate, evaluate, and refine model outputs so systems perform safely and usefully. Contributors work on tasks from prompt design and response scoring to fine-tuning and RLHF. This role sits at the intersection of engineering and annotation: you will create automation flows that rely on LLMs, then systematically evaluate and improve their outputs so they're reliable in production. Hands-on work that directly influences model quality and user-facing behavior.Accessible remote work with opportunities to specialize in prompt engineering and LLM integrations.Role OverviewWe're hiring an AI Workflow Engineer to develop, test, and refine LLM prompts and evaluation criteria for automation pipelines. This contract, part-time role requires ~20+ hours per week and focuses on content generation, personalized outreach flows, and communication automation. You'll integrate LLMs via APIs/SDKs and automation tools, design instruction-led prompts and chains, structure inputs and templates, and run rubric-based QA and evaluation to improve output quality and reliability. Employment type: Contractor, Part-time.Time requirement: 20+ hours/week.Compensation: Hourly pay $15–$45 (posted top rate $45/hr).Data type: Text; label types include evaluation rating, fine-tuning, RLHF, coding/function-calling annotations.What You'll DoYou will design and iterate on prompt strategies and multi-step chains, implement input templating and cleaning, and integrate LLMs into automation pipelines using REST APIs, SDKs, or tools like Zapier. You'll also define evaluation rubrics and perform systematic reviews of model outputs. Create and refine prompts, instruction sets, and chained prompts for consistent structured outputs.Integrate LLMs using REST APIs, SDKs, webhooks, and automation tools.Perform rubric-based QA, evaluation ratings, and labeling to support fine-tuning and RLHF.Review outputs for content quality, reliability, and legal reasoning where applicable.Build and improve templates, input cleaning, and data-structuring processes to reduce error rates.RequirementsYou must have hands-on experience evaluating LLM outputs, strong prompt engineering skills, and prior work integrating LLMs into automation workflows. This is an intermediate-level role; we expect demonstrable experience rather than only theoretical knowledge. Experience evaluating LLM outputs for legal reasoning quality.Hands-on text annotation, evaluation, or rubric-based QA experience.Experience integrating LLM APIs via REST APIs, SDKs, or automation tools (e.g., Zapier).Strong prompt engineering background: instruction design, chaining, and structured outputs.Skilled in building AI-powered content automation for communication and outreach flows.Proficient at data structuring, templating, and input cleaning.Knowledge of LLM limitations and mitigation methods.CV must be in English, state your English proficiency level, and include email address and phone number.Location & EligibilityThis project is available worldwide except for a set of restricted locations. Applicants located in those places cannot be acquired for this role. Restricted countries: Iran, Cuba, North Korea, Syria, Sudan, Venezuela, Myanmar, Russia, Belarus, Palestine.Restricted single-country: Switzerland.Restricted locations: China, Taiwan.Restricted single-country: Kenya.Restricted U.S. states: Alaska, Arkansas, California, Connecticut, Delaware, Georgia, Hawaii, Illinois, Indiana, Kansas, Louisiana, Maine, Maryland, Massachusetts, Nebraska, Nevada, New Hampshire, New Jersey, New Mexico, Ohio, Oregon, Tennessee, Utah, Vermont, Washington, West Virginia.Restricted territories and special regions: Antarctica; Aruba; Åland Islands; Saint Barthélemy; Bonaire, Sint Eustatius and Saba; Bouvet Island; Cocos (Keeling) Islands; Democratic Republic of the Congo; Cook Islands; Christmas Island; Western Sahara; Falkland Islands (Malvinas); French Guiana; GuadWho Should ApplyApply if you're an intermediate-level practitioner who enjoys blending prompt engineering with systems thinking — building reliable automation that uses LLMs and improving outputs through structured evaluation. Ideal candidates have real integration experience and a track record of rubric-driven QA or annotation work. Good fit: prompt engineers, ML engineers with LLM experience, annotation leads, or automation builders with LLM API experience.Not required: formal ML degrees — relevant hands-on e