Snapshot
- Company: EightCountyDigital Ltd (eightcountydigital.com), founded by Charles Revill, a UK manufacturing engineer a decade into his career.
- Use case: E.L.I, an "Improvement Companion" that digitizes lean manufacturing tools (5S audits and roughly 15 more), guides novices through them, and connects users to suppliers in an in-app marketplace.
- Before: lean improvement ran on paper checklists that shop-floor staff misfiled, mis-filled, and lost. The idea sat in Charlie's diary for two years behind a wall called "learn to code."
- After: built in about four weeks on Bolt.new with Supabase and Stripe, live with engineers, production managers, and suppliers, and a limited company founded around it within a month.
- Key metric: idea to functioning paid product in four weeks, around a full-time engineering job.
The idea diary
Charlie Revill keeps a diary of ideas. He's an engineer, ten-odd years of it, first on trains and now in manufacturing, and the occupational hazard of that career is seeing broken processes everywhere. "I'm always looking at things that think, oh, how could we do that better?" he said. "It's kind of annoying actually, because it's hard to switch off from it."
He wears it lightly. Charlie is easy company, the kind of interviewee who laughs off a glitchy meeting link with "even the technology thinks it's Monday" and then, two minutes later, is walking you through waste-elimination methodology with obvious affection for it. The cheerfulness is real, and so is the ambition underneath.
The ideas went into the diary and stayed there, because the toll gate on every one of them was the same. "I've had all these crazy ideas," he said. "I've always had loads of really cool ideas and then I've never actually been able to do very much with them." Building any of them meant learning to code, which meant time he didn't have, or hiring developers, which meant money that made no sense for a side project.
One idea refused to leave the diary. It had been in there about two years. So he asked Google Gemini how a person might build it. Gemini pointed him to Bolt.
The clipboard problem
The idea came from the lean side of his work. Lean improvement, the Toyota-lineage discipline of stripping waste out of how things get made, runs on a set of standard tools, and Charlie had used them across his whole career. The workhorse is the 5S audit: walk a production area, checklist in hand, and make the workspace efficient piece by piece. Hospitals use it. Factories live by it.
And nearly everywhere, in 2026, it's still paper. There's an irony in that worth sitting with: the discipline that taught the world's factories to hunt waste still travels through those factories on the most wasteful medium in the building. AI writes software now. The 5S audit rides a clipboard. "It's a checklist activity and it's pretty time consuming," Charlie said. "People on the shop floor don't want to use it and don't use it properly and it's hard to trace and things get lost."
An engineer with a decade of lean methods in his hands knew exactly what the digital version should do. He just couldn't build it. Then he could.
Efficiency, lean, improvement
E.L.I stands for those three words, and it's built as a companion rather than a form. An apprentice or a novice engineer opens an audit and E.L.I walks them through it step by step, catches sections filled out wrong, and prompts fixes before bad data gets saved. The platform now holds 15 or 16 digitized lean tools, each one Charlie has used on real shop floors.
The cleverest part happens mid-audit. If the audit turns up something missing, 5S tape, say, E.L.I points the user to a supplier that sells it, inside an e-commerce marketplace Charlie built into the app. Real suppliers are already on it. "They've got a resolution rather than going to the manager of a problem," he said. "They've got everything solved there and then."
It's the kind of idea that sounds obvious the moment you hear it and somehow didn't exist: the audit finds the gap, and the same screen fills it. A decade on shop floors went into knowing that's where the process breaks.
Four weeks, and it all worked
Charlie is an engineer; coding was new territory for him. "I'm not a coder at all," he said. His first taste of AI building was dropping some AI-generated code into the StackBlitz editor and watching it assemble in front of him. Then he tried Bolt.new, an AI app builder, typed in the idea, and it started to build.
The infrastructure came together in about four weeks. Supabase, the database platform, was new to him and connected without drama. He bought a domain early. Then came the moment that sold him: a Stripe test purchase that unlocked a gated area of his own tool. "I had my own database in Supabase. I had Stripe set up where people could make payments and get access. And it all worked," he said. "And I got it done so quickly. That was unbelievable."
The reaction from friends he showed it to matched his own. "Every time I get the same reaction I had. It's like, I can't believe it. Something that would take us weeks, months to do, you just type what you want and it does it very, very well."
A company within a month
Charlie founded a limited company around E.L.I within a month of starting the build. Not because the product was finished, but because he could see where it was going. "This is the thing which I know will save people hours, therefore it's saving money," he said. "I was coming from the field, it was quite easy for me to go, right, I need to get ahead of this."
Engineers use it. Production managers use it. Suppliers joined for the marketplace. The feedback so far has been good enough that his biggest problem is restraint. "The biggest problem I've had actually is scope control, because each time I go and create something within E.L.I, I want to make more and more," he said. "It's too good."
The day job stays, for now, and he's honest about why. "There's a lot of risk. I really do like my day job as well." But building E.L.I gives him something the day job structurally can't. At a big manufacturer, an engineer owns a small slice of a very long process. "Now I'm having control over the whole process."
The niche is the moat
Ask Charlie what stops a bigger company from building E.L.I and he doesn't talk about code. "Before, having a developer was really hard to acquire and expensive, but you still have the niche expert who would direct the developer," he said. "Now you've got that within Bolt. So I have the niche knowledge of what I know will help people, so I can use Bolt as the developer to build it."
He's watched larger companies ship fragments of what E.L.I does. "I think I've done a better job than them," he said, "without blowing my own head up too much." And he thinks incumbents everywhere should take note: "There's going to be a lot more as people come to grips with this sort of technology. People trying to make their own thing with the niche knowledge that they've got."
His advice for anyone with their own idea diary takes one line. "They need to log on and give it five minutes, and that will change completely, because that's all it takes. You don't even have to spend a penny."
