How a Solo Founder Used AI to Build a $1.8B Business (Solopreneur Playbook)

I stopped scrolling mid-feed this week. The headline: a solo founder, working from his living room in LA, built a company tracking toward $1.8 billion in revenue this year. No VC funding. No team of fifty. Just one guy, his brother, and a stack of AI tools.

I have read a lot of bold AI claims over the past two years. Most of them dissolve when you look at the details. This one did not. And the lessons inside this story are ones I think every small business owner needs to hear.

What Matthew Gallagher Actually Did

In September 2024, Matthew Gallagher launched Medvi, a GLP-1 telehealth startup, from his home in Los Angeles. He started with $20,000 and zero employees.

Medvi sells GLP-1 weight-loss drugs online. But Gallagher did not build a pharmaceutical company in the traditional sense. He outsourced the doctors, prescriptions, and shipping to existing telehealth platforms , CareValidate and OpenLoop. The entire operation took two months and $20,000 to stand up.

The results in his first full year: $401 million in sales. 250,000 customers. A 16.2% net profit margin. His only hire was his brother Elliot, plus a handful of contract engineers and account managers.

Now he is tracking toward $1.8 billion in 2026 revenue. Sam Altman predicted in 2024 that a one-person billion-dollar company would happen. Matthew Gallagher may be the proof.

And here is the part that fascinates me: the first real example of this is not some revolutionary AI product. It is a guy selling weight-loss drugs from his living room.

The AI Stack: Every Tool and What It Replaced

This is the part I want you to pay attention to, because this is where the playbook lives. Gallagher did not just "use AI." He replaced entire departments with specific tools. Let me break it down.

ChatGPT and Claude , Replaced: Developers and Copywriters

Gallagher used ChatGPT and Claude to write the code for Medvi's website and customer-facing systems. He also used them for marketing copy, email sequences, and business operations. Where a traditional startup would hire a development team and a copywriter, he had AI handle both.

Midjourney and Runway , Replaced: Creative Agency

For ad creatives, product imagery, and video content, Gallagher turned to Midjourney for image generation and Runway for video. No design team. No agency retainer. No three-week review cycles. He could go from concept to finished creative in hours.

ElevenLabs , Replaced: Voice Talent and Audio Production

For any audio or voice needs in ads and customer communications, ElevenLabs handled AI-generated voiceovers. Another line item that would normally require contractors or an agency.

Custom AI Agents , Replaced: Customer Service Team

This is the big one. Instead of hiring a customer service team to handle 250,000 customers, Gallagher built custom AI agents to manage customer inquiries, follow-ups, and support. Think about the math: at that customer volume, you would normally need dozens of support reps. He replaced them with AI.

CareValidate and OpenLoop , Replaced: Medical Staff and Logistics

The telehealth platforms handled the doctors, prescriptions, and shipping. This is not AI per se, but it is the same principle: outsource what you do not need to own.

What This Means for You

I want to be clear about something: the lesson here is not "go build a billion-dollar company." Most of us are not going to do that, and that is perfectly fine.

The real lesson is this: AI lets you operate way above your weight class. A solopreneur can now do what used to require a team of twenty. A two-person operation can compete with companies that have entire departments for marketing, customer service, design, and development.

Think about your own business for a second. How many of these apply to you?

• You are spending money on a designer or agency for basic creative work that AI image tools could handle
• You are writing all your marketing copy from scratch instead of using AI to draft and refine
• You are answering the same customer questions over and over instead of building an AI-powered FAQ or chatbot
• You are manually doing admin tasks , scheduling, follow-ups, data entry , that AI agents could automate
• You are not growing because you cannot afford to hire, but you have not explored what AI could replace

Gallagher did not have some secret advantage. He had $20,000 and a willingness to let AI do the work that used to require people. That same willingness is available to every business owner reading this right now.

The Honest Take

I would not be doing my job as your AI coach if I did not add some context here.

Medvi operates in the GLP-1 telehealth space, which is one of the hottest and most controversial markets in healthcare right now. Demand for weight-loss drugs is enormous. The regulatory landscape is still catching up. And there are real questions about the long-term sustainability of this specific business model.

Not everyone will build a Medvi. Not everyone should try. The GLP-1 gold rush has its own risks, and this story may look different in two years.

But here is what does transfer to your business, regardless of your industry:

• Use AI to replace expensive labor where possible. You do not need a full-time employee for every function. Start with the tasks that are repetitive, predictable, and high-volume.
• Move fast. Gallagher went from zero to a live business in two months. AI compresses timelines dramatically. If you are spending six months on a launch, ask yourself what AI could cut that to six weeks.
• Stay lean. Every hire is a fixed cost. Every AI tool is a variable cost that scales with you. Build your business on a stack, not a headcount.

Those three principles , replace, accelerate, stay lean , are industry-agnostic. Whether you are a coach, a consultant, a service provider, or a product business, the same logic applies. AI is the leverage that lets a small team punch way above its weight.

Your Next Step

If this story has you thinking , good. That is the point. You do not need to go build a billion-dollar company tomorrow. But you should be asking yourself one question: where am I still paying for work that AI could handle?

Maybe it is your marketing copy. Maybe it is customer support. Maybe it is the admin work that eats three hours of your day. Whatever it is, there is almost certainly an AI tool that could do it faster, cheaper, and at scale.

The gap between businesses that adopt AI and businesses that do not is widening every month. A year from now, the companies that moved early will have compounding advantages in cost, speed, and capability. The ones that waited will be playing catch-up.

I do not want you to be in the second group.