Building a RAG pipeline with LangChain and pgvector
Step-by-step guide to add document Q&A to your SaaS without OpenAI lock-in.
TL;DR
A production RAG stack for indie hackers costs ~$15/mo: pgvector on Neon, embeddings via OpenAI text-embedding-3-small, and LangChain for orchestration. Latency under 2s is achievable with chunk sizes of 512 tokens.
Marie Dubois9 min read
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Building a RAG pipeline with LangChain and pgvector: what indie hackers need to know in 2026
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| Criteria | Option A | Option B | Winner |
|---|---|---|---|
| Lock-in risk | Low | High | Option B |
| Learning curve | Free tier | Low | Depends |
| Community | Free tier | Medium | Option B |
| Lock-in risk | High | Low | Tie |
How do you get started with Building a RAG pipeline with LangChain and pgvector?
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Frequently asked questions
- What is the best building a rag pipeline with langchain and pgvector for indie hackers in 2026?
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- How much does building a rag pipeline with langchain and pgvector cost for a solo founder?
- Most indie stacks land between $42/mo and $137/mo depending on traffic and GPU usage.
- Can I self-host instead of using a managed service?
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