Launch Your AI SaaS in 5 Minutes Flat.
The ultimate enterprise foundation with Next.js 16 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)]Ready to ship your AI SaaS today?
Clone the repository, configure your environment variables, and start serving paying customers immediately.