Lesson 3: Building in Public
Course: The AI-First Startup Playbook
Estimated time: 20 minutes
Difficulty: Intermediate Builder
The best marketing channel for a solo builder costs nothing but transparency. You do the work anyway. You share what you're learning. People who find it interesting follow along. Some of them become customers. The ones who don't become customers share it with people who do. Over time, you have an audience that already trusts you before you ask them to buy anything.
Building in public is not a content strategy. It's a posture. The work is the content. You're just choosing to do it visibly.
Why This Works (The Actual Mechanism)
Building in public works because it compresses two things that normally take years: trust and reach.
Trust usually comes from time and repeated interactions. When you build in public, every post is an interaction. Someone sees you figure out a hard problem. They see you make a mistake and correct it. They see the real numbers, not the polished version. They see you care about the craft. By the time you launch, some portion of your audience has been watching you for months. They trust you before you ask them for anything.
Reach usually requires either existing relationships or a marketing budget. Building in public trades budget for consistency. One post a day for six months gets further than any ad campaign a solo builder can afford. The algorithm rewards consistency. More importantly, interesting progress posts get shared - by other builders, by people who found the content useful, by accounts larger than yours who share good stuff they see.
The compounding effect is what makes it work. Your 10th follower is less valuable than your 100th, which is less valuable than your 1,000th. The value of the audience accelerates as it grows. The posts that got you to 100 followers look embarrassing compared to what you'll write at 1,000. That's fine. You can't get to 1,000 without going through 100.
What to Share
The fear most builders have about building in public: "What if I don't have anything interesting to say?"
You're building something. Everything you learn along the way is interesting to someone who's about to learn the same thing. The bar is lower than you think.
What actually performs:
Revenue milestones and screenshots. Your first dollar, your first $100, your first $1k MRR. These resonate because they're specific and real. "I made my first $100 today" is more compelling than any polished marketing message.
Mistakes and what you learned from them. "I spent three days building a feature nobody wanted. Here's what I'd do differently." This performs because it's honest and useful. People learn more from your mistakes than from your wins.
Technical decisions and the reasoning behind them. "Why I chose X over Y for my tech stack" or "the architecture that let me build this in a weekend." Builders share this stuff because it's immediately useful.
Progress that shows real work. A screenshot of your dashboard growing. A graph of signups over time. A before/after of a feature you built. Visual proof of progress.
Observations from building. You're learning things about your market, your users, your tools. Share those observations. "Something weird I noticed: users who sign up on mobile never come back. Users who sign up on desktop have 70% retention. No idea why yet." That kind of specific, honest observation is interesting.
What doesn't perform:
Generic advice you read somewhere else. "The most important thing for startup success is solving a real problem." Everyone says this. It's not coming from your experience. Skip it.
Over-polished content that hides the reality. Building in public works because it's real. If you make it feel like a marketing brochure, it loses the thing that makes it work.
Complaints without resolution. Venting about how hard building is, without what you're doing about it, tends to attract energy that won't help you. Share the problem and what you're trying.
Where to Build in Public
The right platform depends on where your audience is. Here are the honest trade-offs:
X (formerly Twitter). Highest ceiling for reach in the builder and startup audience. The building-in-public community is largest here. Short-form posts get picked up by larger accounts. The algorithm rewards engagement and consistency. The downside: it's noisy and the signal-to-noise ratio on follower counts is low. An account with 500 engaged followers who are in your target market is worth more than 5,000 general followers.
Indie Hackers. Built specifically for this. Your target audience is already there looking for exactly what you're going to post. The community is engaged and comments are substantive. Slower audience growth than X, but the audience is much more targeted. Post your revenue milestones here. The monthly income threads get real engagement.
Newsletter. The owned channel. Email is where you convert followers into paying customers. Building a newsletter alongside your public posts means you have a direct line to your most interested followers that isn't controlled by an algorithm. Substack is the path of least resistance. Beehiiv is a stronger choice if you want detailed subscriber analytics.
LinkedIn. Underrated for certain audiences. If your product targets businesses, LinkedIn building-in-public posts are often less competitive than X and reach decision-makers directly. The engagement tends to be more professional, which matches some markets better.
Discord / Slack communities. Share specific updates in communities your target audience is already in. Not spammy, value-adding shares. "I just built X to solve Y - curious if others in this community have the same problem." This converts better than any social post because the audience is already qualified.
The default recommendation: start with X and a newsletter. X for reach and discovery, newsletter for converting that reach into an owned relationship.
The Flywheel
Building in public creates a flywheel when done consistently:
You post about what you're building. Some people follow because they find it interesting. You post more. More people follow. A larger account shares one of your posts. You get a batch of new followers. Some of those followers become users. Users give you feedback. That feedback becomes a post ("users told me X, I built Y in response"). More people follow. The cycle repeats.
The flywheel accelerates when:
- Your content is specific and honest (not generic)
- You post consistently (daily or near-daily, not weekly)
- You engage with comments and replies (people who get a response remember you)
- You hit a milestone that's worth celebrating publicly (first revenue, first 100 users, etc.)
- You get a share from an account larger than yours
The flywheel stalls when:
- You post generic content that anyone could have written
- You post inconsistently (one burst, then silence)
- You stop engaging with your community
- You run out of things to say (usually because you stopped building, not because you actually ran out)
The Mechanics: Making It Sustainable
Building in public fails most often because builders treat it like a second job on top of building. That's not the model. The content comes from the building. The discipline is noticing what's worth sharing and sharing it quickly, not spending hours crafting posts.
A sustainable daily rhythm:
5-10 minutes: At the end of each work session, write one sentence about what you figured out today or what you're stuck on. Don't edit it. Just capture it.
10-15 minutes: Turn that sentence into a post. Add context, add a screenshot if you have one, add a question if you want engagement. Post it.
5 minutes: Reply to any comments or DMs from yesterday's post.
That's it. 20-30 minutes per day. The content doesn't need to be polished. It needs to be real and frequent.
Batch when you can't post daily. If you have a demanding day job, batch-write posts on the weekend. 5 posts on Sunday covers the week. Scheduling tools (Buffer, Hypefury) handle distribution.
Screenshot everything. Your analytics dashboard, your code editor when you shipped something, your terminal output when something finally worked, your Stripe dashboard when you get a payment. Screenshots convert better than text and take zero extra time to produce.
Revenue Transparency: How Far to Go
Sharing revenue is the highest-performing content type for building in public. It's also the one builders are most reluctant to share.
A few frameworks for thinking about it:
Share when it's meaningful to your audience, not just meaningful to you. Your first dollar matters. $100 MRR matters. $1,000 MRR matters. Your exact April revenue with percentages and breakdowns might be more information than useful. Share the milestones, not the full P&L.
Share in percentage terms when absolute numbers feel too exposed. "Revenue is up 40% this month" is honest without exposing exact numbers. As you grow a more engaged audience, transition to absolute numbers. They convert better because they're more concrete.
Don't share revenue you can't repeat. "I made $2,000 in one day because of a viral post" sets expectations your next post won't meet. Share the recurring, structural numbers that reflect the actual health of the business.
Exercise: Write Your First Build-in-Public Post
This exercise doesn't have a "right" format. The goal is to publish something real today.
Pick one of these prompts and write a post around it (300-500 words for a newsletter draft, shorter for X):
Option A: What you're building and why.
Not the marketing pitch version. The real story. What made you start this? What do you actually want to accomplish? What's harder than you expected so far?
Option B: Something you figured out this week.
A technical thing, a product insight, a market observation, a mistake you made. Be specific. Name the problem, describe how you found the answer, and say what it means for your project.
Option C: A decision you had to make.
What were the options? What did you choose? Why? What might change your mind later?
Write the draft. Then do this before posting:
- Read it out loud. If any sentence sounds like it was written for a press release, rewrite it.
- Remove any sentence that could have been written by someone who wasn't you, in your situation, this week.
- Check that it contains at least one specific detail (a number, a tool name, a platform, a decision) that proves it's real.
Post it. Somewhere. It doesn't have to be perfect. It has to be published.
Key Takeaway
Building in public is the cheapest and most effective marketing channel for solo builders - because the content comes from work you're doing anyway. The only thing you have to change is choosing to do it visibly.
What's Next
You're building in public, which means you'll have an audience by launch. Lesson 4 covers the hardest transition: turning what you've built from a side project into a real business - pricing it, selling it, and knowing when it's time to go all-in.