Recommended Tech Stacks for Agent Products
Next.js, Python, LangGraph, Vercel, Supabase - proven stacks for solo founders and small teams.
Full-stack JS path
Next.js + Vercel AI SDK + Postgres/Supabase + Stripe is the fastest path from zero to paying customers for solo founders. One language (TypeScript) end-to-end, excellent deployment story (git push to Vercel), and the AI SDK handles streaming, tool calling, and multi-step agents out of the box.
Best when: your agent logic is moderate complexity (5-10 tools, single-agent architecture), you want to ship UI and backend together, and your team is JS-native. The Vercel AI SDK supports OpenAI, Anthropic, and Google models with unified tool-calling interfaces.
Typical architecture: Next.js app with API routes for agent endpoints, Supabase for auth + database + pgvector for RAG, Inngest or Trigger.dev for background jobs, Stripe for billing. Total monthly infra cost under $100 until you have hundreds of users.
Python agent core
FastAPI or Modal for agent workers, LangGraph for state machines, Next.js or React frontend. Best when your agent logic is complex (multi-agent orchestration, custom eval pipelines, heavy data processing) or when your team has ML/Python expertise.
LangGraph excels at stateful agent workflows - loops, branching, human-in-the-loop checkpoints, and persistence across steps. If your agent needs to pause, wait for human input, and resume, LangGraph handles this cleanly. FastAPI serves agent endpoints; Modal or Railway handles deployment and scaling.
Typical architecture: Python backend (FastAPI + LangGraph) deployed on Modal, Next.js frontend on Vercel, Postgres + pgvector for storage, Redis for task queues. More moving parts than the JS path, but better for complex agent logic that would be awkward in TypeScript.
5 more sections in this article
- What to skip early
- Choosing between the two paths
- The parts you should not build
- Where teams regret their choice
- Worked example: the ticket triage agent
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Published 27 July 2026. Last reviewed 17 August 2026. We re-read this library on a schedule and date every article, so you can see for yourself how current it is.