Copywriter - Remote in Cardiff

In this hourly, remote contractor role, you will work as a Copywriting & Content Subject Matter Expert (SME) to review AI-generated marketing/content-writing outputs and/or create expert copy and content, evaluating reasoning quality, intent alignment, and step-by-step writing decisions while providing precise written feedback. You will assess solutions for accuracy, clarity, brand fit, tone, and adherence to the prompt; identify issues in logic, messaging, audience targeting, claims/compliance risk, structure, and style; fact-check statements where needed; write high-quality explanations and model outputs that demonstrate strong copywriting technique; and rate and compare multiple responses based on effectiveness, correctness, and reasoning quality.

This role is with a fast-growing AI Data Services company delivering training data for many of the world’s largest AI companies and foundation-model labs. Your copywriting expertise directly helps improve the world’s premier AI models by making their writing more persuasive, accurate, on-brand, and clearly explained.

Important: There is no immediate project for this role; however, if qualified, you will be among the first experts we reach out to when relevant opportunities arise. This will also provide you with access to future projects available through our expert network.

Your Profile

• Bachelor’s degree (or higher) in Communications, Marketing, Journalism, English, or a related field (or equivalent professional experience).
• 5+ years of professional experience in copywriting, content writing, editorial, content marketing, or brand storytelling.
• Strong command of brand voice, tone adaptation, and audience-aware writing (B2B and/or B2C).
• Ability to evaluate and improve writing for clarity, structure, persuasion, and consistency, including headlines, CTAs, and narrative flow.
• Demonstrated ability to spot and correct factual errors, weak reasoning, overclaims, and potential compliance issues (especially in regulated domains).
• Familiarity with common content formats: landing pages, email campaigns, blog posts, ads, social posts, product copy, scripts, and long‑form guides.
• Comfort providing specific, actionable feedback and writing gold‑standard rewrites with rationale; minimum C1 English proficiency.
• Reliable, self‑directed, and able to deliver consistent quality in an hourly, remote contractor workflow across time zones.
• Prior experience with AI data training/annotation, content QA, editorial operations, or style‑guide governance is strongly preferred.

Key Responsibilities

• Develop AI Training Content: Create detailed prompts and gold‑standard copy/content across multiple formats and industries to guide AI learning.
• Optimize AI Performance: Evaluate and rank AI responses to improve clarity, persuasion, tone match, and factual reliability.
• Ensure Model Integrity: Test AI outputs for inaccuracies, hallucinated claims, bias, unsafe advice, and brand‑risk issues; validate reliability across use cases.