How to Brief a Developer When You Have a Vibe-Coded Prototype

You've spent time building a prototype in Lovable, Bolt, or Rork. You have something real — screens that make sense, flows that work, a concept that's no longer just an idea. And now you've decided it's time to bring in a real developer to take it to production.

This is a great position to be in. Your prototype has already answered the most expensive questions in product development: what does this look like, how does this flow, what matters to users. You've eliminated the discovery phase that accounts for 20–30% of a typical professional build.

The question is how to hand this off in a way that captures all that value. A bad briefing means a developer starts from the same confusion you started with. A good one means they start from the knowledge you spent weeks building.

This guide is the handoff playbook.

What the Developer Actually Needs to Know

The instinct most founders have is to hand over the codebase and say "here's what I built." That's a reasonable starting point, but it leaves out most of what a developer needs to build the right production version.

A developer who only has the code knows what your prototype does. They don't know:

• What you wanted it to do vs. what you had to compromise on
• What users actually responded to in testing
• What flows matter most vs. what was exploratory
• What you explicitly decided to leave out of v1
• What your technical constraints and preferences are

The brief fills all of that in.

Before the First Developer Conversation

Do these three things before you contact anyone.

Export to GitHub

Export your project from Lovable, Bolt, or Rork to a GitHub repository in your account. This is the first thing any developer will ask for, and doing it before the conversation starts signals that you're organized and serious.

In Lovable: Project settings → GitHub → Connect repository. In Bolt: Export code → GitHub. In Rork: Export → GitHub.

If you don't have a GitHub account, create one (it's free) and set up the repository there.

Record a Walkthrough

Before you forget the context that's currently in your head, record a 10–15 minute Loom walking through the prototype. Narrate as you click:

• "This is the landing page. Users arrive here and the main CTA is..."
• "After signing up, they land here. The main thing I want them to do is..."
• "This flow is the core of the product — everything else supports this..."
• "This part doesn't work properly yet — I know it needs to be rebuilt..."
• "This is what users responded most positively to in testing..."

You're capturing product knowledge that lives in your head, not in the code. This video becomes a reference document your developer can return to throughout the build.

Write Down What You Learned From User Testing

If you've tested the prototype with real users (even informal tests), document what you observed. What did they do that you expected? What surprised you? What confused them? What did they ignore? What did they ask for that doesn't exist yet?

This information shapes product decisions throughout the build. A developer who has it makes better choices. One who doesn't is working without the context you spent weeks gathering.

The Briefing Document

Write a brief before your first developer meeting. It doesn't need to be a formal document — a Google Doc with these sections is exactly right.

Section 1: What This Product Is

Three sentences: who uses it, what problem it solves, and how. This is the grounding context for every decision that comes next.

Example: "Prolly is a financial research tool for individual investors. It takes earnings transcripts and filing documents and surfaces the key signals using AI. The target user is a serious retail investor who does their own research and wants to do it faster."

Section 2: The Core User Journey

Write out the primary user flow step by step. Not a feature list — a sequential story of what a user does from arrival to value.

Example:

1. User arrives at the landing page and clicks "Start research"
2. User creates an account with email and password
3. User is taken to the search dashboard
4. User enters a company ticker or name
5. The app surfaces relevant earnings transcripts and filings
6. User can filter by date range and filing type
7. User clicks a document and sees the AI-generated summary
8. User can save documents to a personal library for future reference

This is the flow that must work perfectly in v1. Everything else is secondary.

Section 3: What's in v1 vs. v2

List v1 features and v2 features explicitly. Be specific about what's excluded.

Example v1:

• User authentication (email/password)
• Company search
• Document retrieval and display
• AI-generated summary for each document
• Personal saved documents library

Example v2 (explicitly not in v1):

• Social sharing / collaboration features
• Email alerts for new filings
• Portfolio tracking
• Mobile app (web-first for now)
• Admin panel

Having this list in writing prevents scope creep during the build. When someone suggests "what if we also added X," the answer is "that's on the v2 list — we can discuss it after launch."

Section 4: Third-Party Dependencies

Everything your app connects to or needs to connect to:

• Authentication: Email/password, or social login (Google, GitHub)?
• Database: Supabase (if already using it), or open to recommendations?
• Payments: Stripe? Which products — one-time, subscription, or freemium?
• Email: Which provider (Resend, Postmark, Mailgun)?
• AI features: Which providers (OpenAI, Anthropic, Gemini)?
• External APIs: Any data sources the app pulls from?
• File storage: Supabase storage, AWS S3, Cloudflare R2?

List the accounts you already have and the decisions that are still open.

Section 5: What the Prototype Does Well (and Poorly)

Be honest. This helps the developer decide what to extend vs. what to rebuild.

Example:

• The overall layout and navigation structure is good — I'd like to keep this general approach
• The search UX is close to what I want — the logic needs to be rebuilt but the interaction pattern is right
• The auth flow needs to be completely rebuilt — it doesn't handle edge cases
• The document viewer is rough — I have a clearer vision for this than what's currently there

This section saves your developer from spending time analyzing a codebase you already know the verdict on.

Section 6: What Users Said

A bullet list of the most useful things you learned from user testing:

• "5/5 testers found the main search immediately and knew what to do"
• "3/5 testers were confused by the filtering options — it wasn't clear what each filter did"
• "All testers said the AI summaries were the most valuable part — this is what they'd pay for"
• "Nobody used the saved library feature — might be a v2 feature or might need redesigning"

This gives your developer product priorities grounded in real data rather than assumptions.

Section 7: Launch Goal

What does a successful build look like?

• "Ready to charge 10 paying customers"
• "Ready to demo to seed investors in 6 weeks"
• "Ready for a Product Hunt launch with 500 sign-ups as the goal"
• "A private beta for 50 invited users to get structured feedback"

The build should be optimized for this goal. Different goals require different quality and feature thresholds.

The First Developer Meeting

With the brief prepared and the prototype exported to GitHub, your first developer meeting becomes much more productive.

What to do: Walk them through the prototype live (not the code — the product). Show them each screen, narrate what it does, point out what works and what doesn't. Send them the Loom recording afterward.

What to ask them:

• After seeing the prototype: "What would you keep and what would you rebuild?"
• "Do you see any architectural concerns in the existing codebase?"
• "Given the v1 scope, what's your initial sense of timeline and approach?"
• "What clarifying questions do you have about the brief?"

What to notice:

A developer who asks good questions about your users, your constraints, and your v2 plans is paying attention to the right things. One who dives immediately into the technical implementation without understanding the product context is going to make product decisions without you.

Common Briefing Mistakes

Treating the prototype as the spec. The prototype shows one version of your product. The brief captures the product thinking behind it — what you intended, what you learned, what decisions are still open. Both are required.

Skipping the v2 list. Without an explicit v2 list, every meeting surfaces new "what about" questions that don't have a clear answer. The v2 list is a parking lot that keeps the scope honest.

Not documenting user testing findings. If you tested the prototype and have insights, document them. Otherwise your developer is making product decisions based on their assumptions about your users — which is worse than their own judgment.

Telling the developer how to implement things. Your brief should describe what you want, not how to build it. "The search should return results as the user types" is a product requirement. "We should use debouncing with a 300ms delay on the search input" is an implementation detail that might be right or wrong depending on context. Let the developer make implementation decisions — it's what you're paying for.

Underestimating what "done" means. Your launch goal shapes the entire build. "Done" for a 10-person private beta is different from "done" for a public launch. Define it clearly so the developer can optimize toward it.

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We work with founders who come in with prototypes all the time — and the quality of the brief they bring is one of the biggest predictors of how well the build goes. Book a free call and we'll walk through your prototype together, give you our honest read on the code, and tell you exactly what the production build would look like. Book a free call →