Next.js + Vercel + Postgres SaaS stack
A pragmatic SaaS architecture for a small team: Next.js App Router on Vercel, Postgres (Neon/Supabase), S3 for files, Stripe billing, Resend for transactional email, and Upstash Redis for caching and rate limits.
Architecture previewNext.js + Vercel + Postgres SaaS stack
Recreate this in Raltey
Copy this prompt
Paste this into Raltey's AI agent to generate the same diagram, then tweak it on the canvas.
Prompt
Create an architecture diagram for a Next.js SaaS on Vercel. The user browser hits Next.js on Vercel, which reads from a Neon Postgres, an Upstash Redis cache, and an S3-compatible store. Vercel calls Stripe for billing, and Stripe sends webhooks back. Vercel sends transactional email through Resend. Errors and source maps go to Sentry.
Context
- - Single Next.js codebase (App Router) serves UI and API.
- - Postgres as primary DB, Redis as cache and rate limiter.
- - Third parties handle email and payments.
Patterns
- - Single deployment unit (Next.js) keeps team small.
- - Edge cache + Postgres = good defaults for most pages.
- - Webhooks (Stripe) come back into Vercel API routes.
Diagram structure
Nodes and connections
User browseractor
Next.js on Vercelservice
Postgres (Neon)db
S3-compatible storagestorage
Upstash Rediscache
Stripeexternal
Resend (email)external
Sentryexternal
Connections
User browserNext.js on Vercel
Next.js on VercelPostgres (Neon)
Next.js on VercelUpstash Redis
Next.js on VercelS3-compatible storage
Next.js on VercelStripeAPI
StripeNext.js on Vercelwebhook
Next.js on VercelResend (email)
Next.js on VercelSentry
Notes from the field
- Use a separate database branch per preview deploy if Postgres provider supports it (Neon does).
- Keep image uploads behind signed S3 URLs to avoid Vercel egress.
- Add a Sentry source-map upload to your deploy hook.
Frequently asked
Is Vercel a single point of failure?
In practice, yes for this stack. For higher availability, add a fallback deployment on Fly.io or Cloud Run and a DNS-level failover.
Why Upstash Redis?
It is HTTP-based which plays nicely with Vercel functions (no persistent connections needed). For long-lived workers, regular Redis is fine.
More templates
FlowchartSaaS onboarding email flowFlowchartCustomer support runbook flowFlowchartPayment webhook retry and error flowFlowchartGitHub PR review and merge flowFlowchartLogin with magic link flowArchitectureThree-tier SaaS architecture on AWSArchitectureMicroservices architecture on KubernetesArchitectureReal-time data pipeline on GCP
Open this template in Raltey
Edit it on the canvas, ask the AI agent to extend it, then share or export.
Start for free