How I Built a Multi-Provider AI Contract SaaS

I recently finished a major version of ContractAI, an AI-powered contract automation platform.
Instead of building a simple "prompt → contract" application, I wanted to build the surrounding workflow as well.
The architecture now covers:
AI contract generation
Risk analysis
AI negotiation
Rich text editing
E-signatures
Template marketplace
Stripe billing
REST API
Bulk generation
Team collaboration
Admin tools
Multi-provider AI
The application supports five providers:
OpenAI
Anthropic
Google Gemini
Groq
xAI
This allows the application to switch providers instead of depending entirely on one model vendor.
Marketplace
The platform currently contains 185+ contract templates across categories including business, SaaS, employment, real estate, finance, marketing and IP.
Templates can be free or purchased through Stripe.
Stack
Next.js
TypeScript
PostgreSQL
Prisma
TipTap
Stripe
Resend
BullMQ / Redis
Docker
Vercel
The live application is available here:
https://aicontract.live
The demo can be explored without creating an account.
I'm currently considering transferring the project to another founder rather than continuing to operate it myself, so I'm also interested in hearing what developers think the most interesting direction for the product would be.