Copywriter

This is a conversion copywriting role — not brand copywriting, not long-form content marketing. You'll write the words that go inside experiments, landing pages, email campaigns, and paid ads across B2B, B2C, and nonprofit clients. Every line you write has a hypothesis behind it and a test in front of it. You'll also build and manage brand-specific AI writing agents that scale our copy output while preserving voice integrity. You'll work closely with strategists, designers, and analysts to produce copy that moves metrics, not just reads well.

This is a long-term fractional contractor role. Most contractors stay on contract — the relationship is designed to be sustainable at part-time hours. Conversion to full-time employment happens selectively when there's a clear business need and mutual interest. Either way, we're looking for someone we can build with long-term.

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About Cro Metrics

At Cro Metrics, we're on a mission to redefine growth for organizations and brands through unparalleled digital experiences that inspire action and deliver results. We are an experiment-led growth marketing agency that partners with mission-driven and high-growth companies to scale through data-driven experimentation. Our expertise spans A/B testing, personalization, paid media, lifecycle marketing, and full-funnel digital strategy — empowering clients to make smarter decisions that drive measurable results.

Our fully remote team of strategists, analysts, engineers, and creatives works across industries including eCommerce, fintech, nonprofit, and hospitality. We believe in autonomy, collaboration, and innovation as we help our clients grow smarter and faster.

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About the Role

The Copywriter: Conversion & Growth Copy is responsible for producing high-quality, hypothesis-driven copy across Cro Metrics' integrated service lines. You'll write headline variants for A/B tests, landing page copy, email and SMS campaigns, paid media ad copy, and product page rewrites — always grounded in a strategic rationale and designed to be tested. You'll work across B2B, B2C, and nonprofit clients, adapting messaging to audiences that range from enterprise buyers to individual donors to direct consumers.

This role is ideal for a copywriter who thinks in hypotheses, writes for conversion, and can shift between brand voices quickly and confidently — whether that's a nonprofit appeal, a B2B SaaS landing page, or a DTC promo campaign. You won't be writing blog posts or thought leadership — you'll be writing the copy that goes live inside experiments and campaigns, where every word has a measurable impact.

The first 5–10 business days of the engagement are a paid evaluation period. You'll do real client work at your full contract rate. At the end, we'll either continue the engagement, extend the evaluation for a few more days if we need more signal, or end the engagement — and in all three cases, we'll tell you why and pay for all hours worked.

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What You'll Do

• Write conversion-focused copy for A/B tests — headline variants, CTA copy, value proposition rewrites, and messaging hierarchy tests — each variant mapped to a clear hypothesis.
• Produce landing page copy from briefs and wireframes, collaborating with designers to ensure messaging and layout work together.
• Write email and SMS copy for lifecycle campaigns (welcome flows, abandoned cart, win-back, promotional sends) within client brand voice guidelines.
• Create paid media ad copy across platforms (Meta, Google, LinkedIn) — headlines, descriptions, and creative copy that drives clicks and conversions.
• Rewrite underperforming copy based on test results and analytics — diagnosing what's not working and proposing data-informed alternatives.
• Adapt quickly to new client brand voices, absorbing voice guides and existing copy to produce on-brand work from the first deliverable.
• Collaborate closely with strategists on hypothesis development — your copy is the execution layer of their experimentation roadmap.
• Manage your workload across multiple concurrent clients and projects, communicating proactively about capacity, timelines, and blockers.
• Use AI tools to accelerate drafting, variant generation, and research — while maintaining the craft, originality, and strategic rigor that make great copy.
• Build, train, and manage brand-specific AI writing agents — creating custom prompts, voice calibration files, and guardrails so AI output stays on-brand for each client. Maintain and iterate on these agents as client voices evolve.
• Write for nonprofit audiences with the same conversion rigor applied to commercial clients — donation pages, fundraising emails, advocacy campaigns, and impact-driven landing pages where the "product" is a mission.

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What We're Looking For

• 3–6 years of experience in conversion copywriting, direct-response writing, CRO copy, or performance marketing copy.
• A portfolio demonstrating copy that was written to be tested — headline variants, landing pages, email campaigns, or ad copy with clear strategic framing.
• Ability to write across multiple brand voices quickly and accurately — you can absorb a voice guide and produce on-brand copy on the first pass.
• Strong strategic instinct — you understand why copy converts, not just what sounds good. You think in hypotheses, value propositions, and objection handling.
• Experience writing for digital channels: web (landing pages, PDPs, funnels), email/SMS, and paid media (social and search ads).
• Experience writing for nonprofit or mission-driven organizations — you understand that conversion copywriting for nonprofits means donation optimization, fundraising appeals, and impact framing, not just "awareness."
• Comfort with volume and speed — you can produce multiple variants quickly without sacrificing quality or strategic thinking.
• Clear communication skills — you ask good questions about briefs, flag ambiguity early, and explain your copy rationale to non-writers.
• Advanced AI fluency — beyond using AI as a drafting tool, you can build and manage brand-specific AI writing agents. You know how to create system prompts, calibrate voice, set guardrails, and evaluate AI output quality. You treat AI agents as tools you maintain, not just chat windows you type into.
• Self-directed and reliable — you manage your time well, meet deadlines consistently, and don't need to be micromanaged.

AI is a hard requirement, not a preference. This role requires active, demonstrated use of AI tools in your daily workflow — and goes further. You'll be expected to build and manage brand-specific AI writing agents that the team can use at scale. You'll be asked to show concrete AI-integrated workflows and agent-building experience during the interview process. Candidates who cannot demonstrate practical AI tool use and agent creation will not advance.

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Must Haves

• Experience writing copy for CRO, experimentation, or growth marketing — not just brand or content marketing.
• Experience at an agency or in a multi-client environment where you managed competing priorities and fast turnarounds.
• Familiarity with A/B testing methodology — you understand control vs. variant, statistical significance, and how copy variables are isolated in tests.
• Experience writing email/SMS copy
• Experience writing paid media copy (Meta, Google, LinkedIn) with awareness of character limits, platform specs, and creative best practices.
• Experience writing for nonprofit clients — fundraising campaigns, donation page optimization, advocacy messaging, or grant-related communications.
• Demonstrated experience building AI writing agents — custom GPTs, Claude projects, or similar tools configured with brand voice, tone rules, and output guardrails for specific clients.

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What Success Looks Like

• You consistently deliver on-brand, hypothesis-driven copy on time and with minimal revision cycles.
• Strategists and designers trust your copy output and view you as a reliable creative partner.
• You manage a steady cadence of deliverables across multiple clients without quality or strategic rigor dipping.
• Every variant you write has a clear rationale — you can explain why each one should win.
• You proactively flag brief gaps, ask clarifying questions early, and communicate about capacity honestly.
• Over time, you build reusable copy frameworks and swipe files that make the whole team faster.
• You build and maintain AI writing agents that the team actually uses — they produce on-brand first drafts that save hours, and you keep them calibrated as client voices evolve.
• You move fluidly between nonprofit, B2B, and B2C clients without a quality drop — understanding that each requires different conversion psychology while applying the same testing rigor.

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How to Apply

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