Saas Trinity

Building SaaS apps is slow and repetitive, with developers spending months rebuilding the same foundations. Kiro solves this by providing a fast, AI driven way to build fully functional SaaS platforms

Comment

SaaS Trinity: Our Skeleton Crew Hackathon Journey

https://github.com/viks120/Saas-Trinity

đź’ˇ Inspiration

As developers, we've all felt the pain of starting new SaaS projects. Every single time, you rebuild the same foundation: authentication, subscription tiers, admin panels, feature gates. It's exhausting and time-consuming.

When we discovered Kiro's Skeleton Crew hackathon, we saw an opportunity to test a bold hypothesis: What if AI-assisted development could let us build three complete SaaS applications in the time it normally takes to build one?

We wanted to prove that AI isn't just a coding assistant—it's a force multiplier that can fundamentally change how fast we ship production-ready software.

🎯 What We Built

We created three fully functional, production-ready SaaS applications:

1. Subscription Starter Kit

A reusable foundation that every SaaS needs:

  • JWT authentication with secure session management
  • Three-tier system (Free, Pro, Enterprise)
  • Feature gating based on subscription levels
  • Admin dashboard for user and tier management
  • Role-based access control

2. Smart PDF Processor

An intelligent document processing platform:

  • PDF upload and text extraction using PyPDF2
  • AI-powered text analysis and summarization
  • Tier-based word limits (500/5000/unlimited)
  • Document library with search and filtering
  • Real-time processing status tracking

3. Browser Gaming Platform

A casual gaming platform with monetization:

  • Three complete browser games (Tic-Tac-Toe, Whack-a-Mole, Memory Match)
  • Tier-based game access control
  • Global leaderboards with score tracking
  • Real-time statistics and analytics
  • Game catalog with filtering

🛠️ How We Built It

Tech Stack

  • Backend: Python FastAPI with async support
  • Frontend: React with modern hooks and context
  • Database: MongoDB with Beanie ODM
  • Authentication: JWT tokens with bcrypt hashing
  • Deployment: Docker Compose orchestration
  • Testing: Property-based testing with Hypothesis

Development Process

1. Spec-Driven Development We used Kiro's spec workflow to create detailed requirements and design documents for each application. This upfront planning paid massive dividends later.

2. Iterative Implementation Rather than building everything at once, we:

  • Started with the subscription starter kit as our foundation
  • Reused the authentication and tier system across all three apps
  • Built each application incrementally, testing as we went

3. Property-Based Testing We didn't just write unit tests—we implemented property-based tests to verify correctness across all possible inputs. For example:

  • Round-trip testing for PDF text extraction
  • Invariant testing for tier-based access control
  • Metamorphic properties for game score calculations

4. Modern UI/UX We invested in beautiful, modern interfaces:

  • Gradient backgrounds with smooth animations
  • Responsive design that works on all devices
  • Consistent design system across all three apps
  • Intuitive navigation with clear user feedback

🚧 Challenges We Faced

Challenge 1: Docker Service Conflicts

Problem: All three applications initially used the same service names in Docker Compose, causing port conflicts and networking issues.

Solution: We prefixed all service names with the application name (e.g., fun-games-backend, smart-pdf-mongodb) and carefully managed port mappings.

Challenge 2: Tier System Consistency

Problem: Each application needed tier-based access control, but implementing it three times would be error-prone.

Solution: We created a reusable FeatureGate component and backend service that could be shared across applications with minimal modifications.

Challenge 3: Property-Based Testing Learning Curve

Problem: Writing effective property-based tests requires a different mindset than traditional unit testing.

Solution: We focused on common patterns like round-trip properties, invariants, and metamorphic properties. The investment paid off with higher confidence in our code.

Challenge 4: PDF Processing Reliability

Problem: PDF extraction can fail with malformed files or unusual encodings.

Solution: We implemented robust error handling, fallback strategies, and clear user feedback when processing fails.

Challenge 5: Real-Time Game Communication

Problem: Browser games needed to communicate scores back to the parent application securely.

Solution: We used the postMessage API with origin validation to create a secure communication channel between iframes and the main app.

đź“š What We Learned

1. AI-Assisted Development is Transformative

Kiro didn't just help us write code faster—it helped us think through architecture, catch edge cases, and maintain consistency across three separate applications.

2. Spec-Driven Development Works

Taking time upfront to write detailed requirements and design documents made implementation smoother and reduced back-and-forth.

3. Reusability is Key

Building the subscription starter kit first gave us a solid foundation. We reused 60-70% of the authentication and tier logic across all three apps.

4. Property-Based Testing Catches Real Bugs

We found several edge cases in our PDF processing and game scoring logic that traditional unit tests would have missed.

5. Modern UX Matters

Even in a hackathon, investing in beautiful, intuitive interfaces makes the difference between a demo and a real product.

6. Docker Orchestration is Powerful

Being able to spin up all three applications with a single docker-compose up command made development and testing dramatically easier.

🎉 What's Next

These aren't just hackathon projects—they're production-ready applications. Our next steps:

  • Deploy all three applications to cloud infrastructure
  • Add payment integration (Stripe) to the subscription system
  • Expand the game library with more titles
  • Add more AI features to the PDF processor
  • Create comprehensive documentation and tutorials
  • Open source the starter kit for other developers

🏆 The Bottom Line

We proved our hypothesis: AI-assisted development with Kiro enabled us to build three production-ready SaaS applications in days, not months.

This isn't about replacing developers—it's about amplifying what we can accomplish. With Kiro, solo developers and small teams can now build what previously required large engineering organizations.

The future of software development is here, and it's faster, more ambitious, and more accessible than ever before.

Built with ❤️ using Kiro for the Skeleton Crew Hackathon

Share this project:

Updates