Insights

Practical notes on building RAG, OCR and document AI.

Articles written from the work: retrieval design, evaluation methods, legal and regulated documents, and where controlled agents belong. Each one is grounded in public sources or in what we have built, and says so.

New articles are added as we finish them. Subscribe to the RSS feed, or start with the pieces below.

Latest

Articles

OCR · 17 September 2026

Invoice OCR is the easy part. Validation is what lets finance trust the result.

A worked example on one scanned invoice: the fields OCR read, the nine checks applied, the one low-confidence field that fails, and what the reviewer sees. Plus the checks every invoice pipeline should run and how to evaluate one.

Read the article
Legal RAG · 14 September 2026

Why legal RAG needs hybrid search: reciprocal rank fusion, explained with lawyers' queries

Lawyers ask two kinds of question that no single retrieval method answers well. How hybrid retrieval fixes it, how reciprocal rank fusion merges the results, and what fusion still cannot do: reranking, chunking, temporal validity and permissions.

Read the article

Related reading

The reference material behind the articles.

RAG development services

How we design ingestion, retrieval, citation and evaluation for permission-aware knowledge systems.

Explore RAG services

Planning guide

Checklists for documents, evaluation, security, integrations and pilot scope before a project starts.

Open the planning guide

Legal and compliance documents

The workflow for clause extraction, cited policy retrieval and expert review.

See the legal workflow

Your documents

Bring a question you cannot currently answer from your documents.

We will show how retrieval performs on your own material and what a pilot would need to prove.