Skip to content
Start a conversation Talk to us Menu
Start a conversation

Make data and AI useful

Get answers from your own documents, with the sources

An assistant that searches the documents your team is allowed to see and answers with references, so people spend less time searching through folders and old threads.

In short

A knowledge assistant uses retrieval-augmented generation (RAG). It searches only the documents a person is authorized to see, gives the model that context, and returns an answer that cites its sources where retrieval supports them. When the evidence is thin, it says so and points to a person.

Last updated

01 The problem

What problem does this solve?

Policies, manuals, runbooks and past answers live in different tools. Finding the right one takes time, so people ask the colleague who knows instead, and that colleague answers the same questions again and again.

A general chatbot cannot see your documents, and pasting them in raises access and privacy questions. A useful assistant has to respect who is allowed to see what, and say when it does not know.

02 What we build

What do we build?

  • Document ingestion with parsing, chunking and metadata enrichment
  • Retrieval that searches only what each user is authorized to see
  • Hybrid search and reranking, tuned on your real questions
  • Answers with source references and an escalation path
  • An evaluation set of representative business questions
  • Monitoring of answer quality, latency and cost per answer

03 Architecture

What does a typical architecture look like?

Typical architecture of a knowledge assistant The flow runs from top to bottom. Your knowledge: Policies, manuals and wikis, Databases and tickets. Ingestion: Parsing and chunking, Metadata and embeddings. Retrieval: Permission-filtered search, Hybrid search, reranking. Model: Hosted foundation model, Output and policy checks. Application: Answers with sources, Escalation on thin evidence. Identity, audit and evaluation on every layer. YOUR KNOWLEDGE Policies, manuals and wikis Databases and tickets INGESTION Parsing and chunking Metadata and embeddings RETRIEVAL Permission-filtered search Hybrid search, reranking MODEL Hosted foundation model Output and policy checks APPLICATION Answers with sources Escalation on thin evidence Identity, audit and evaluation on every layer
Documents are indexed with their permissions, retrieval searches only what the user may see, and the answer is checked before it reaches them.

04 How it goes

How does the work usually go?

  1. Collect the real questions

    We gather the questions your team actually asks and agree what a good answer looks like. These become the test set.

  2. Prepare the sources

    We inventory the documents, confirm who may see what, and set up ingestion that keeps the index current.

  3. Build and test retrieval first

    Retrieval quality decides answer quality, so we measure it against the test set before tuning prompts or models.

  4. Pilot with agreed criteria

    A time-boxed pilot with success criteria, known limitations and a clear decision to proceed, revise or stop.

  5. Launch and keep measuring

    We release with monitoring of quality, latency and cost, and review the results as documents and questions change.

Talk through an AI idea

30 minutes, video call. Prefer to write? Send a message

05 Capabilities and stack

Which capabilities and technologies are involved?

  • LangGraph
  • LlamaIndex
  • PostgreSQL with pgvector
  • OpenSearch
  • Amazon Bedrock
  • Google Vertex AI
  • FastAPI

The final stack follows your requirements and what you already run. How we choose technology

06 A typical situation

What does this usually look like?

A services firm with years of proposals, policies and project notes depends on the few people who know where things are.

A pilot on one team's documents, tested against their real questions, shows whether an assistant helps.

07 Questions

Questions people ask

Retrieval is filtered by the signed-in user's permissions before the model sees any content, and we test for unauthorized disclosure as part of the evaluation before launch.

Not by default. A hosted foundation model with good retrieval is the starting point, and we consider fine-tuning only where testing shows retrieval alone cannot reach the quality you need.

The assistant should say the evidence is insufficient and point to a person or team instead of guessing. We include these cases in the test set.

08 Who it suits

Who does this suit?

Talk through an AI idea

Start with the business problem. We will help you decide whether AI fits, what a first version could look like, and when simpler automation is the better answer.

30 minutes, video call. Prefer to write? Send a message

What happens next

  1. You pick a time, or send us a message.
  2. A person at Nexstella reads what you shared before we talk.
  3. You leave with a clear next step, even when that step is to wait.