Launch Your AI SaaS in 5 Minutes Flat.
The ultimate enterprise foundation with Next.js 15 App Router, pgvector Contextual RAG, LangGraph Multi-Agent Workflows, Auth.js v5, and Stripe Subscriptions.
Decomposed goal into real-time Tavily search queries & factual synthesis schema.
Scoured 5 authoritative web sources; verified pgvector cosine similarity chunks.
Generated 4-part Executive Brief with clickable source citations.
Full-Stack Architecture
Everything You Need to Scale an AI Business
Battle-tested architectural modules built with clean domain boundaries, zero circular dependencies, and discriminated union error handlers.
Module 1: Auth & Stripe Billing
Auth.js v5 with Google OAuth & Resend Magic Links. 3-tier Stripe subscriptions ($19 Hobby, $49 Pro, $99 Team) with automated webhook reconciliation.
Module 2: AI Chat + pgvector RAG
Streaming chat via Vercel AI SDK v4. Text chunking (500 tokens), OpenAI text-embedding-3-small, and cosine similarity search directly inside PostgreSQL.
Module 3: LangGraph Multi-Agent
3-Node StateGraph (Supervisor, Researcher with Tavily web search, Summarizer). Real-time Server-Sent Events (SSE) streaming thoughts to the UI timeline.
Module 4: Teams & Admin Superuser
Multi-tenant B2B team management with JWT-signed invites. Role-gated Admin portal with user management, DB latency, and 24-hour token metrics.
DevOps & Observability
Pino structured JSON logging, Prometheus metrics (/metrics), pre-configured Grafana dashboard, and multi-stage Dockerfile.prod standalone build.
Token Accounting & Credits
Atomic credit deduction per query, exact cost calculation (in USD cents), and detailed UsageLog auditing per user and workspace.
Engineering Excellence
Production Clean Architecture
[Client / Browser (React 19, Tailwind, shadcn/ui)]
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[Middleware (Route Protection & Superuser Gating)]
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[API Layer (withValidation + Zod + Prometheus Metrics)]
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├──► [Services: RAG Ingest & pgvector Cosine Search]
├──► [Services: LangGraph StateGraph (Supervisor ➔ Researcher ➔ Summarizer)]
├──► [Services: AI Router (GPT-4o, Claude 3.7, Gemini 2.0)]
└──► [Services: Stripe Subscription & Webhook Reconciler]
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[Data Layer (Prisma ORM 6.4 + PostgreSQL 16 + Redis 7 + Pino)]Got Questions?
Frequently Asked Questions
What's included in this boilerplate?
Everything you need to launch: Next.js 15, Auth.js, Stripe subscriptions, LangGraph for AI workflows, pgvector for RAG, and an admin panel.
Is this production ready?
Yes. It uses strict TypeScript, proper error handling, a multi-stage Docker build, and robust API validation.
Do I need an active Stripe account?
You can use Stripe in test mode during development. For production billing, you will need to activate your Stripe account.
Ready to ship your AI SaaS today?
Clone the repository, configure your environment variables, and start serving paying customers immediately.