Building a Complete Freelance Website with Google Antigravity Free AI
How I built a production-ready Next.js freelance portfolio website from scratch using Google's free Antigravity AI powered by Claude Sonnet 4.5, including SEO optimization, blog system, and AWS deployment.
In November 2025, Google released Antigravity, a revolutionary AI coding assistant that's completely free and powered by Anthropic's Claude Sonnet 4.5. After using it to build my entire freelance portfolio website, I'm convinced it's a game-changer for developers.
What is Google Antigravity?
Google Antigravity is a free AI-powered coding assistant developed by Google DeepMind's Advanced Agentic Coding team. Unlike traditional coding assistants, Antigravity uses Claude Sonnet 4.5 as its underlying model and operates in an "agentic" mode - meaning it can plan, execute, and verify complex coding tasks autonomously.
The Challenge: Building a Complete Portfolio Website
I needed a professional freelance website with specific requirements:
- Modern Next.js 14 with TypeScript
- JSON-based content management (no database)
- Comprehensive SEO optimization
- Full blog system with RSS feeds
- Client project showcase
- AWS Lambda deployment
- Recruiter-specific contact section
Instead of spending weeks coding this manually, I decided to test Google Antigravity's capabilities.
The Antigravity Experience
What impressed me most was Antigravity's systematic approach. Using Claude Sonnet 4.5's advanced reasoning, it:
1. Planning Phase
Antigravity created a detailed implementation plan, breaking down the entire project into manageable components. It proposed the tech stack (Next.js 14, TypeScript, Tailwind CSS), content structure, and deployment strategy - all in a structured markdown document for my review.
2. Execution Phase
Once I approved the plan, Antigravity autonomously:
- Set up the Next.js project with optimal configuration
- Created JSON content schemas for all pages
- Built type-safe content loading utilities
- Implemented all page components (Home, About, Services, Work, Blog, Contact)
- Added comprehensive SEO features (metadata, structured data, sitemap, RSS)
- Created AWS Lambda deployment infrastructure with Terraform
3. Verification Phase
Antigravity tested the build, verified all routes were generated correctly, and created detailed documentation of everything implemented.
Key Features Built by Antigravity
JSON-Based Content Management
Instead of a complex CMS, Antigravity created a simple JSON-based system where all content lives in version-controlled files. This makes updates as easy as editing a JSON file - no database, no admin panel, just straightforward content management.
SEO Optimization
The SEO implementation was particularly impressive. Antigravity added:
- Dynamic sitemap generation
- RSS feed for blog posts
- Structured data (JSON-LD) for all content types
- Open Graph and Twitter Card metadata
- Proper semantic HTML throughout
Blog System
A complete blog with tag filtering, related posts, reading time calculation, and RSS feed - all generated from simple JSON files.
AWS Deployment
Antigravity created production-ready Terraform configuration for deploying to AWS Lambda, optimized for the free tier with ARM64 architecture and efficient resource allocation.
Why Claude Sonnet 4.5 Makes a Difference
The power of Claude Sonnet 4.5 is evident throughout the code. The AI understood context across the entire project, maintained consistency in coding patterns, and made intelligent architectural decisions. It's not just generating code snippets - it's thinking through problems like an experienced developer.
Customization and Iteration
What's remarkable is how easy it was to customize. When I asked for changes like:
- Removing company names from project showcase
- Adding skills from my resume
- Adjusting page layouts
- Changing service offerings
Antigravity understood the context and made precise changes without breaking existing functionality.
The Free Advantage
The fact that Google Antigravity is completely free is incredible. You get access to Claude Sonnet 4.5's reasoning capabilities at no cost, making professional-grade AI coding assistance accessible to everyone.
Real-World Results
After our coding session, I have:
- A production-ready Next.js website
- 10 real project showcases
- Complete blog system
- Full SEO optimization
- AWS deployment infrastructure
- Clean, maintainable TypeScript code
All built in a single session with an AI assistant.
Tips for Using Antigravity Effectively
1. Be Specific
Antigravity works best when you provide clear requirements. Instead of "build me a website," specify technologies, features, and constraints.
2. Review the Plan
Antigravity creates implementation plans for complex tasks. Review these carefully - it's your chance to guide the direction before code is written.
3. Iterate Freely
Don't worry about getting everything perfect upfront. Antigravity excels at making adjustments and refinements based on feedback.
4. Leverage Context
The AI maintains context across the entire session. Reference previous work, ask it to check your existing files, and build incrementally.
Conclusion
Google Antigravity, powered by Claude Sonnet 4.5, represents a new era in AI-assisted development. It's not just a code completion tool - it's a collaborative partner that can plan, build, and verify complete applications.
For freelance developers, this is transformative. What used to take weeks can now be accomplished in hours, with professional-grade results. And the fact that it's completely free makes it accessible to developers at any level.
If you haven't tried Google Antigravity yet, I highly recommend giving it a shot. Whether you're building a portfolio, a client project, or just experimenting with new technologies, Antigravity can accelerate your development workflow while maintaining high code quality.
The future of coding is agentic, intelligent, and surprisingly - free.