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AI content writer, prompt engineer, and LLM evaluator designing adversarial prompts and structured human feedback to improve reasoning, accuracy, and safety in large language models. Former U.S. Marine Corps distribution management specialist known for exceptional attention to detail, independent execution, and process improvement in high-accountability environments. I combine analytical problem-solving with long-form writing, documentation, and quality assurance to evaluate AI-generated outputs, rank multiple responses objectively, and provide actionable error analysis for model improvement.…AI content writer, prompt engineer, and LLM evaluator designing adversarial prompts and structured human feedback to improve reasoning, accuracy, and safety in large language models. Former U.S. Marine Corps distribution management specialist known for exceptional attention to detail, independent execution, and process improvement in high-accountability environments. I combine analytical problem-solving with long-form writing, documentation, and quality assurance to evaluate AI-generated outputs, rank multiple responses objectively, and provide actionable error analysis for model improvement.

Joshua Hepner

AI Prompt Engineer, AI Evaluator, Data Annotator, +2

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AI content writer, prompt engineer, and LLM evaluator designing adversarial prompts and structured human feedback to improve reasoning, accuracy, and safety in large language models. Former U.S. Marine Corps distribution management specialist known for exceptional attention to detail, independent execution, and process improvement in high-accountability environments. I combine analytical problem-solving with long-form writing, documentation, and quality assurance to evaluate AI-generated outputs, rank multiple responses objectively, and provide actionable error analysis for model improvement.…AI content writer, prompt engineer, and LLM evaluator designing adversarial prompts and structured human feedback to improve reasoning, accuracy, and safety in large language models. Former U.S. Marine Corps distribution management specialist known for exceptional attention to detail, independent execution, and process improvement in high-accountability environments. I combine analytical problem-solving with long-form writing, documentation, and quality assurance to evaluate AI-generated outputs, rank multiple responses objectively, and provide actionable error analysis for model improvement.

Available to hire

AI content writer, prompt engineer, and LLM evaluator designing adversarial prompts and structured human feedback to improve reasoning, accuracy, and safety in large language models. Former U.S. Marine Corps distribution management specialist known for exceptional attention to detail, independent execution, and process improvement in high-accountability environments.

I combine analytical problem-solving with long-form writing, documentation, and quality assurance to evaluate AI-generated outputs, rank multiple responses objectively, and provide actionable error analysis for model improvement.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Work Experience

Data Annotation Specialist – AI Model Evaluation at DataAnnotation Tech

May 1, 2026 - Present

Evaluate and improve Large Language Models (LLMs) through adversarial prompt engineering, response evaluation, and structured human feedback to enhance reasoning, accuracy, safety, and conversational quality. Engineered adversarial prompt scenarios to identify hallucinations, policy violations, and instruction-following failures, and evaluated AI responses against complex contextual requirements. Compared and ranked multiple model outputs using objective evaluation criteria, documenting contradictions, missed constraints, reasoning failures, formatting issues, and policy compliance problems with actionable feedback.

Warehouse Associate at Jetpack Shipping

January 1, 2024 - January 1, 2025

Supported fast-paced warehouse and shipping operations with a focus on productivity and accuracy. Increased packing throughput from about 300 to over 500 orders per day through workflow improvements, improved efficiency from 88% to 92%, developed improved picking methods that exceeded team averages, and maintained accuracy in high-volume operations.

Distribution Management Specialist at United States Marine Corps

January 1, 2016 - January 1, 2020

Managed mission-critical inventory receiving, storage, and global distribution operations with strict accountability and operational readiness. Supervised an eight-person receiving team processing 400+ inventory items daily, improved receiving efficiency by 16% via redesigned scanning procedures, and authored/updated Standard Operating Procedures (SOPs) to reflect changing requirements. Created quick-reference documentation that doubled workflow efficiency for common requests and maintained strong operational efficiency and inventory accuracy.