Building a SaaS MVP with Google Antigravity — Defining Your Idea, Implementing Core Features, Deploying on GitHub
Building a SaaS MVP — Defining Your Idea, Implementing Core Features, Deploying on GitHub
SaaS (Software as a Service) sounds like something only a development team can build — tools like Notion, Slack, and Figma come to mind. But combining Antigravity with free deployment platforms makes it genuinely possible for a non-developer to build and launch a working MVP entirely on their own. I tried it myself. This post walks through the full process of building a simple SaaS MVP from scratch with Google Antigravity and deploying it via GitHub and Cloudflare Pages.
▶ Table of Contents (click to expand)
Defining Your Idea — How to Scope Your MVP and Communicate It to Antigravity
What Is an MVP?
MVP stands for Minimum Viable Product — the simplest possible version of a product that includes only its core features. It's not a finished product; it's a starting point. For example, if you're building a food delivery app, the MVP might be nothing more than the ability to place an order. Payments, reviews, and real-time delivery tracking come later. The goal of an MVP is not to build something perfect — it's to launch quickly and learn from real user reactions.
Before building a SaaS MVP, the most important step comes first: deciding clearly what you're going to build. If the idea is too broad, the AI struggles to find direction — and the scope creeps until you can't finish.
The Core Principle of MVP — Start Small
The MVP principle is simple: include only the minimum features needed to deliver the core value. For example, if you want to build a team task management SaaS, your first MVP includes only these three features:
- Add a task
- Mark a task complete
- Assign a task to someone
Features like notifications, analytics dashboards, and file attachments come after the MVP.
Using User Scenarios to Communicate Your Idea
A good way to sharpen your idea is to write a user scenario first.
"When a user opens the app, they see a to-do list. Adding a new task makes it appear in the list. Each task can be assigned to someone. Checking a completed task turns it gray."
Paste this scenario directly into the Agent Manager and the AI understands the required features and data structure, then creates an implementation plan.
The key is to describe things from the user's perspective, not in technical terms. Instead of "Create a RESTful API to handle CRUD operations," say "Users need to be able to add, edit, and delete tasks." The AI picks the right technical implementation.
Implementing Core Features — Building a SaaS's Essential Elements Step by Step in Antigravity
Once your idea is defined, start building in Antigravity. Most SaaS MVPs share a set of common elements: user signup and login, a way to store and retrieve data, and a clean interface.
Step-by-Step Implementation Order
Trying to build all of this at once gets complicated. Working through it in stages is much more efficient.
Step 1 — Set up the UI structure
Instruct: "Create a layout with a sidebar on the left and a main content area on the right. The sidebar has menu items." The overall layout is complete.
Step 2 — Build the core feature screens
For a task management SaaS, you need a task list screen, a new task form, and a detail view. Request each screen in order.
Step 3 — Connect the data
To start, you can use the browser's local storage to persist data. Replace it with a real database later.
Build Small, Check Often
The habit of testing in the built-in browser and committing to GitHub after each step is important. Saving in small units makes it easier to find the cause of a problem and quickly return to a previous state. Asking the AI to build a complex feature all at once increases the chance of errors. Breaking it into small pieces and checking each one is faster overall.
Design Quality Tip — How You Ask Changes What You Get
When building UI through vibe coding, the result often looks plain or outdated. A small change in how you phrase the request can make a big difference. Instead of "add a button," try one of these:
- "Build this with a modern, trendy design" — generates a contemporary-looking UI overall
- "Use Tailwind CSS with a clean, minimal style" — emphasizes structured layout and whitespace
- "Make it look simple and professional, like Notion or Linear" — references a well-known SaaS design as a target
The more specific the style direction you give, the better the AI's design output. Including a design direction alongside every feature request is the simplest way to raise the quality of the finished product.
Deploying on GitHub — The Final Step to Share Your MVP with the World
Once MVP features are complete, it's time to deploy through Cloudflare Pages. There are important things to verify before deploying.
Pre-Deployment Checklist
- Feature validation — Confirm all core features work correctly in the built-in browser. Test signup, login, and data storage in sequence.
- Mobile compatibility — Switch to mobile view in the built-in browser and check for any broken layouts. If there are issues, ask the AI: "Fix this to be responsive so it looks good on mobile."
- Error handling — Confirm that the app shows appropriate guidance messages rather than crashing completely when invalid input or unexpected situations occur.
After Deployment Is Where the Real Work Begins
Once everything is ready, push the final commit to GitHub. Cloudflare Pages starts deploying automatically and a publicly accessible URL is generated within minutes.
An MVP is not a finished product. When people actually use it and give feedback, incorporating that feedback is the next step. Thanks to Antigravity and GitHub's automatic deployment, you can receive feedback, make fixes, and redeploy — cycling through that loop quickly.
Q&A — Frequently Asked Questions
Q. How long does it take to build a SaaS MVP?
It depends on scope, but for a simple MVP with three or fewer core features, you can have a working product within a day or two using Antigravity. Shipping quickly rather than building perfectly is the essence of an MVP.
Q. How do I add a login feature?
Ask the Agent Manager: "Add Google login functionality." The AI will implement social login using Firebase Authentication. No need to set up your own server.
Q. Will data saved in localStorage disappear if a different user opens the app?
Yes. localStorage is tied to the browser it was saved in, so it isn't shared across devices or users. For a SaaS intended for multiple users, you'll need to replace it with a cloud database like Firebase Firestore.
Q. How do I collect user feedback after deploying the MVP?
You can embed a Google Forms link inside the app, or add a simple feedback form to the bottom of the app. Just ask the Agent Manager: "Add a feedback submission form to the bottom of the app."
Conclusion
Combining Google Antigravity, GitHub, and Cloudflare Pages creates a complete pipeline from idea to publicly deployed SaaS MVP. Defining your idea, implementing features step by step, and deploying through Cloudflare Pages via GitHub is a flow anyone can follow — even without development experience. The important thing is not to target a perfect finished product from the start. Deploying an MVP with only core features quickly, then improving it based on real user reactions, is the more effective approach. The next post covers advanced usage — extending Antigravity with MCP integration.
Do you have a SaaS idea? Let us know in the comments what problem you'd like to build a service to solve.
Sources: Ali H. Salem — Master 80% of Google Antigravity in 27 Minutes / Wanderloots — What Is Google Antigravity? AI Coding Tutorial & Gemini 3 App Build
📅 First published: 2026-05-15 | 🔄 Last updated: 2026-05-30
📝 Changelog: h1 title added, FAQ section added, author information added, MVP concept explanation added, design quality tip added