Leasey
Solution

Retrieval-Augmented Generation

End-to-end RAG pipelines from ingestion to retrieval to answer generation, built for accuracy and cost control.

Ingest, embed, retrieve, generate — reliably

We build RAG systems that survive contact with real data: messy PDFs, changing sources, permissioned content, and long documents. Chunking strategy, hybrid retrieval, reranking, caching, and eval-driven iteration — we tune each layer against your data.

Outcomes

3-5x
retrieval hit rate vs naive baseline
50-80%
embedding cost reduction via caching
<5%
hallucination rate on eval set
How we build it

Our approach.

01

Corpus audit

We profile your data: doc types, sizes, churn rate, permissions, language. The shape of the corpus dictates the shape of the pipeline.

02

Chunk & embed

We pick chunking per content type (fixed, semantic, layout-aware), choose embeddings, and version both so you can A/B upgrades safely.

03

Hybrid retrieval + rerank

BM25 and vector search combined, then a reranker on top. We measure hit rate @ k against a gold set — if it's not measured, it's not tuned.

04

Generation, cache, iterate

Prompts versioned, generations cached where safe, faithfulness scored continuously. Every change goes through eval gates.

Capabilities

What you get.

Ingestion pipelines for PDF, HTML, Confluence, Notion, S3, SharePoint
Semantic + BM25 hybrid retrieval with reranking
Chunking strategies tuned per content type
Metadata filtering and permission-aware retrieval
Caching layers for embeddings, retrieval, and generation
Continuous eval on retrieval hit rate and answer faithfulness
What it looks like

Production-shaped, from day one.

retrieve.ts
// Hybrid retrieval with rerank + permission filter
const chunks = await retriever.search({
  query,
  topK: 40,
  filters: { tenant: user.tenant, acl: user.groups },
  hybrid: { semantic: 0.7, bm25: 0.3 },
})

const reranked = await rerank(query, chunks, { topK: 8 })
const answer = await generate({
  query,
  context: reranked,
  citeSources: true,
})
// -> { text, citations, hit_rate, faithfulness }
Architecture

A proven shape for this solution.

We adapt it to your cloud, data, and compliance requirements. Nothing here is boilerplate — every layer is justified by the numbers.

01
Ingestion workers (Lambda / Azure Functions / ECS)
02
Embedding pipeline with model versioning
03
Vector DB (Pinecone, Weaviate, pgvector, OpenSearch)
04
Reranker (Cohere, Voyage, cross-encoders)
05
Generation layer with prompt versioning and A/B routing
Use cases

Where this shows up.

  • Policy and compliance Q&A over regulated documents
  • Engineering knowledge search over code, tickets, and docs
  • Healthcare data lookup with permission-scoped retrieval
  • Sales enablement over contracts, decks, and call notes
Stack

What we use.

We’re not religious about tools. We pick what fits your constraints and team.

Pinecone
Weaviate
pgvector
OpenSearch
LlamaIndex
LangChain
Cohere Rerank
OpenAI Embeddings
Voyage AI
In production

Shipped examples.

Healthcare

Healthcare patient data mapping & health information chat

Mapped and normalized patient data to power a grounded chat experience where patients can ask questions about their own health information — safely.

AWS BedrockAnthropic ClaudepgvectorLangGraphLangfuse
Common questions

What teams usually ask.

Which vector database should we use?

+

If you already run Postgres, start with pgvector. If you need massive scale or hosted ops, Pinecone. If you want open-source control, Weaviate or Qdrant. We decide on the numbers, not the brand.

How do you handle documents that change over time?

+

Ingestion pipelines track source versions and re-embed only what changed. We keep an index of doc versions so old answers can still cite the exact version they saw.

How is retrieval quality measured?

+

Labeled gold sets for hit rate @ k, adversarial sets for edge cases, and production samples scored with an LLM-as-judge faithfulness metric. All versioned in the repo.

Ready to accelerate your tech growth?

Schedule your free consultation today and let's discuss how we can help your business scale efficiently.

Tech growth illustration
Ready when you are

Let’s ship your AI system.

Whether you’re scoping a new LLM product, hardening an existing one, or standing up the infra behind it — we’ll map the shortest path to production.

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