Open-Source RAG Assistant Code Released With LangChain And LangGraph

Original post

We should build a church for people who open-source their code so everyone can learn from it.

Here is the complete source code of a RAG assistant to navigate airline policies.

You get the complete source code and video from @lenadroid, walking you through everything she did (I'm linking to the video in the first comment below).

The fact that you can watch every engineering decision that Lena made when building this app is pure gold.

A few things you'll pick up from this:

• It uses LangChain for the retrieval pipeline • It uses LangGraph for conversation state • It stores embeddings in Postgres with pgvector • It indexes documents to ground answers in the source text • It uses Terraform to stand up the infrastructure

I'm linking to the video walkthrough and the source code below.

7:35 AM · Jun 24, 2026 · 5.1K Views

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Santiago@svpino

There are a ton more examples on the @Akamai Developer Hub.

They have a ton of free resources for developers: code samples, tutorials, and walkthroughs like this one. They also run a Discord with office hours and weekly build sessions if you'd rather build alongside people than read alone.

Here is the link to the Developer Hub: https://fandf.co/4eQpigB

And here is the video walkthrough. You'll find the link to the source code in the description:

https://www.youtube.com/watch?v=ETVwGljIVV4

Super worth following Lena @lenadroid and team, who are pumping out a ton of great content like this!

Thanks to the Akamai team for partnering with me on this post.