Neptik
Turning Years of Expertise Into a Scalable AI Asset
Lead generation lives or dies on copy quality. Neptik had perfected theirs over years—but couldn't scale beyond what one person could write. We trained AI on their proven data and built agents that generate full campaigns 95% faster, turning hard-won expertise into a growth engine.
Overview
For lead generation agencies, email copy is everything. The difference between messages that land in inboxes and get responses versus those that hit spam folders and get ignored comes down to craft—and Neptik had spent years perfecting that craft.
The problem: their expertise had become a constraint. The distinctive style that made campaigns successful couldn't be delegated, and growth was limited by content production capacity. We built AI agents fine-tuned on Neptik's proprietary data, turning hours of work into minutes while preserving the quality that drives results.
Who are Neptik?
Neptik is a UK-based lead generation agency specialising in cold email outreach for B2B companies. They help businesses build pipeline through carefully crafted email sequences that cut through the noise and generate genuine responses.
Their track record speaks for itself: consistently high open rates, strong response rates, and clients who stay because the campaigns actually work. But that success created its own challenge—demand was outpacing their ability to deliver without compromising on quality.
The Challenge
Email deliverability is a constant battle. Spam filters are sophisticated, and sending similar content at scale is a fast track to the junk folder. Neptik's solution was systematic content variation: for every client campaign, they'd create multiple versions of each email sequence, ensuring every message was sufficiently different to avoid detection while maintaining the same core messaging.
The variation problem. A typical client campaign might have 5-7 emails in a sequence. But that's just the starting point. To send at scale without triggering spam filters, Neptik needed multiple variations of that entire sequence—each email meaningfully different from its counterparts, while still delivering the same approved message.
Expertise that couldn't be delegated. Over years of testing and iteration, Neptik had developed a distinctive style that consistently avoided spam filters while generating responses. They'd tried delegating: copywriters, agencies, AI tools, ChatGPT. Nothing captured the nuances that made their copy work. The style wasn't just about tone—it was about specific patterns, structures, and word choices refined through tens of thousands of sent emails.
Content became the bottleneck. Writing a single campaign with all its variations could take 8 hours or more. As the client base grew, content creation consumed more and more capacity—time that couldn't be spent on strategy, sales, or scaling the business.
Our Solution
Generic AI tools couldn't solve this problem because Neptik's style was the product. We took a different approach: we built AI that writes like Neptik.
Fine-Tuning on Proprietary Data
We trained models on Neptik's library of tens of thousands of sent emails—the actual copy that had been tested, refined, and proven to work. This wasn't about teaching AI to write good emails generally; it was about capturing the specific patterns that made Neptik's emails effective.
Intelligent Campaign Generation
We built a suite of AI agents that handle the complete campaign creation workflow:
Campaign Drafting Agent. Takes client inputs—their offering, target audience, pain points, desired outcomes—and generates a complete initial campaign. This agent combines Neptik's structural approach (how to open, build interest, close) with the fine-tuned style that avoids spam triggers.
Quality Assurance Agent. Every draft runs through automated spam checking and an evaluation agent that critiques the output against Neptik's standards. The result is polished copy that matches what manual production would deliver.
Variation Generation Agent. Once the primary campaign is approved, regeneration agents create the required variations. Each version maintains the core message while being sufficiently different to avoid deliverability issues—all automatically checked and refined.
Integrated Workflow
The complete system was built into a custom portal that integrates with Neptik's existing tools, making AI-assisted campaign creation a seamless part of their delivery process rather than a bolted-on extra step.
Results
Campaign creation: 8 hours → 25 minutes. What previously consumed most of a working day now happens in under half an hour, with quality that matches manual output.
The bottleneck removed. Content creation is no longer the limiting factor on growth. Neptik can take on more clients without capacity becoming the constraint.
Leadership capacity recovered. Senior time previously spent on content production is now available for strategy, client relationships, and business development.
Quality preserved at scale. The fine-tuned approach means every campaign maintains the standards that made Neptik successful. Clients get the same quality, delivered faster.