RAG
Development
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RAG

RAG Development Services for AI Answers Your Teams Can Verify

Our RAG development services connect large language models to your documents, databases and business apps, so every answer cites its source. Senior engineers take enterprise RAG past the demo and into production, the point where most pilots start to hallucinate.

200+ enterprises transformed
500+ domain trained professionals
US & India delivery centres
TYPICAL TARGET ARCHITECTURE
Docling + Unstructured
Ingestion
PostgreSQL 18 + pgvector
Hybrid retrieval
LangGraph 1.x + Claude or GPT
Agentic layer
Ragas + Langfuse
Evaluation
Trusted by enterprise clients who demand real-world impact
IS .NET RIGHT FOR YOU

Where RAG Is the Right Choice, and Where It Isn't

RAG development services cover the design, build and operation of retrieval-augmented generation systems. Engineers connect a large language model to your approved data and index it for search. For each question, the system finds the most relevant passages. The model answers from those alone, with citations and access controls applied.

Choose RAG when

✓  Your answers live in documents that keep changing. Policies, contracts, product specs and SOPs change every week. RAG picks up a change as soon as the document is re-indexed, with no model retraining.

✓  Someone will ask where an answer came from. In banking, insurance and healthcare, an answer without a source is a liability. RAG returns the passage behind every claim, which gives reviewers and auditors something to check.

✓  Knowledge is scattered across systems and permissions. SharePoint, Confluence, Salesforce and a shared drive each hold part of the answer. RAG can search them together while honoring each source's permissions, and it should sit inside your cybersecurity and compliance controls, not beside them.

✓  You want to swap models without starting over. Your knowledge stays in your index, not in model weights. When a better or cheaper LLM ships, you change the generation layer and keep the retrieval you already tuned.

Where we'd tell you not to

> Your corpus is small and rarely changes. Below a few hundred pages, long-context prompting with prompt caching is simpler and cheaper. There's no index to maintain and nothing to go stale.

> The answer is a number in a table. "What was Q3 churn by region?" is a query, not a retrieval problem. Text-to-SQL over a governed semantic layer answers it more reliably, and that starts with solid data engineering and analytics.

> You need different behavior, not more knowledge. If the model must write in a fixed format, follow a house style or label tickets your way, fine-tuning fits better. Many teams end up with both, and generative AI consulting up front is how you decide the split.

WHAT WE BUILD

Our RAG Development Services

Six kinds of RAG work enterprise teams bring us, each with the stack we'd actually reach for.

Custom RAG Development Services

We build RAG applications around one high-value workflow first, such as policy Q&A, contract review or support deflection. We tune chunking, embeddings and prompts to your documents, then connect the system to your wider enterprise AI solutions roadmap.

LlamaIndex, LangChain, Docling, OpenAI embeddings, Cohere Rerank

RAG Implementation and Pilot Rescue

Plenty of RAG pilots score well in testing and drift in production. We rebuild the weak layer, usually parsing, chunking or ranking. Then we add hybrid search and a reranker, and test every change against a golden question set.

Unstructured, BM25 + vector hybrid search, Cohere Rerank, Ragas

RAG-as-a-Service on Your Own Cloud

For teams that want a managed RAG service without running the pipeline themselves. We deploy and operate it inside your cloud account on a managed platform. We also handle ingestion, tuning and monitoring as your content grows.

Amazon Bedrock Knowledge Bases, Azure AI Search, Vertex AI Search, Terraform, Kubernetes

Enterprise Integration and Permission-Aware Retrieval

We connect RAG to the systems where knowledge actually lives and sync each source's access rules into the index. A user only retrieves what they could already open, enforced at query time rather than by a prompt.

Microsoft Graph API, Confluence API, Salesforce, ServiceNow, Okta

RAG Evaluation, LLMOps and Support

We score retrieval and answers on faithfulness, relevance and context recall. Those scores run in CI, so a regression blocks the release. After launch, tracing, cost dashboards and drift alerts run on the same MLOps services foundation.

Ragas, DeepEval, Langfuse, Arize Phoenix, GitHub Actions

Agentic RAG Implementation

Some questions need more than one lookup. We build agents that plan the search, query several sources, check their own evidence and call tools through MCP. It becomes the retrieval core of wider agentic AI framework integration.

LangGraph, Model Context Protocol (MCP), LlamaIndex Workflows, Claude, GPT
PROOF

RAG and Enterprise Retrieval Work We've Delivered

Three engagements with numbers attached. Every card leads with the outcome, not the technology.

95%+

Sustained 95%+ data extraction accuracy across growing document volumes

Healthcare and Payer Operations

Accelerating Prior Authorization Processing with AI-Driven Data Extraction

Entrans used OCR and large language models to extract and structure data from unstructured authorization documents, then validated it with a configurable rule engine, accelerating processing by 3X.

Read the case study →

70%

70% faster access to critical patient data, with 100% traceability of all retrieval actions

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Healthcare

Streamlining Clinical Data Access for a Leading Healthcare Provider

For a multi-location hospital network, Entrans built a FHIR-compliant API gateway with logging and access control, automating real-time retrieval of lab results, imaging and prior history.

Read the case study →

1

Single point of access for all search queries across hospital systems

Healthcare

Streamlining Hospital Data Retrieval for Faster, Smarter Decision-Making

Entrans built an AI chatbot that runs semantic, role-aware search across EHR, hospital information, pharmacy and document systems, then summarizes results for doctors, nurses and analysts.

Read the case study →
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ENGAGEMENT & COST

How You Engage Us, and What Drives the Cost

Three commercial shapes, and an honest account of what moves the number. You shouldn't have to fill in a form to learn how a partner charges.
WHAT ACTUALLY MOVES THE NUMBER
Seniority mix
An architect-heavy team costs more per month and usually less overall. The wrong mix shows up as rework, not as an invoice line.
Scope certainty
Fixed price needs fixed scope. Where the requirement is still moving, time and materials beats the contingency a fixed bid has to carry.
Compliance requirements
Regulated environments add evidence, review cycles and audit trails. That is real work, and it belongs in the estimate rather than in a surprise.
Integration surface
The number of systems you must talk to predicts effort better than feature count. Ten integrations is a different project from two.
Looking to hire
RAG
developers for your own team instead?
HOW WE DELIVER

Our Enterprise-Ready Delivery Framework

The same five steps on every engagement.
STEP 01
Contextual Readiness
Ready-to-deploy solutions for your environment. We map the existing estate, its dependencies and its constraints before proposing anything.
STEP 02
Seamless Vendor Onboarding
Rapid integration with existing vendor ecosystems. Access, environments, security review and ways of working, handled so engineering time isn't spent on procurement.
STEP 03
Platform-Agnostic Engineering
Works across any technology stack. We build on the stack that earns its place. We won't force a technology decision to suit our bench.
STEP 04
Flexible Engagement Model
Scalable team structures to your needs. The commercial shape can change as the work does, without renegotiating the relationship.
STEP 05
Hybrid Global Delivery
Onshore, nearshore and offshore delivery, with overlap hours that make standups worth attending.
WHEN WE'RE STAFFING A TEAM
Curated profiles · 24 to 48 hrs
Onboard & kickoff · 48 to 72 hrs
Our published staffing SLAs, from the point a requirement is agreed. You interview the engineers before committing.
HOW IT RUNS IN PRACTICE
Two-week sprints, demoable increments, a backlog your product owner controls
Peer review on every change and quality gates that block rather than warn
Canary and blue-green releases with rollback, so a bad deploy is a non-event
TRUST

Built on Trust. Proven in Delivery.

200+
Enterprises Transformed
150+
AI Projects Delivered
$500M+
Business Value Generated
500+
Domain Trained Professionals
“
We have been working with Entrans for the last two years and they have played a key role in building our solution. Their expertise and professionalism were evident throughout the development cycle, and we were very pleased with the final product.
Nikolay Prokopiev
Chief Executive Officer
“
Entrans has been a trusted outsourced product development partner for 2 years now, providing a pool of good quality software engineers to tap into. Their team has a strong customer first orientation, is open to feedback and is a pleasure to work with.
Subramanian Visvanathan
Chief Executive Officer
RECOGNIZED, CERTIFIED & PARTNERED
AWS
Partner Network
Microsoft Azure
Partner
NASSCOM
Member
Databricks
Partner
Denodo
Partner
Google Cloud
Partner
Confluent
Technology Partner
ISO 27001:2022
Certified
MongoDB
Cloud Partner
TiE
Member
SICCI
Member
SOC 2 Type II
Certified
FAQS

RAG Development FAQs

Still have a question?
Ask a senior engineer directly. We reply within one business day.
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Is RAG still relevant now that LLMs have million-token context windows?

Yes, RAG is still relevant, because long context windows handle small, stable document sets but do not replace retrieval at enterprise scale. Sending a whole knowledge base with every question is slow and expensive. Models also miss facts buried deep inside very long prompts. RAG also applies per-user permissions and attaches a citation to each answer, which a stuffed prompt cannot do.

What is the difference between RAG as a service and custom RAG development?

RAG as a service means a provider runs a managed retrieval pipeline for you, while custom RAG development builds one tuned to your data that your team owns. Managed platforms such as Amazon Bedrock Knowledge Bases or Azure AI Search get a first version live quickly. Custom builds win when documents are complex, accuracy targets are strict, or you need control over chunking, ranking and cost. When you compare RAG as a service providers, ask where your data is stored and how they measure answer accuracy.

What is agentic RAG, and when is it worth implementing?

Agentic RAG is a RAG system in which an AI agent decides what to retrieve, from which sources and in what order, instead of running one fixed search. It pays off on multi-step questions, such as checking a claim against current policy and the customer's history. The trade-off is higher latency and cost per answer, plus more places for errors to hide. Start with standard RAG, measure where it fails, and add agentic steps only for those question types.

How long does a RAG implementation take?

A focused RAG implementation on one document set typically reaches a usable pilot in four to eight weeks. Production takes longer. The timeline depends less on the model than on the data. It turns on how many sources you connect, how messy the documents are and how strict the permissions are. Evaluation takes time too. You need a golden set of real questions with agreed answers before anyone can call the system accurate.

Can RAG work with private or on-premise data without sending it to a public LLM?

Yes, a RAG system can run inside your own environment, so documents never reach a public model API. The index, embeddings and retrieval can sit in your VPC or data center. The language model can be a private deployment on Azure OpenAI or Amazon Bedrock, which do not train on your data. It can also be an open-weight model like Llama, served on your own GPUs with vLLM. The choice comes down to answer quality, hosting cost and how much data may leave your network.

NEXT STEP

Start your RAG project brief

Tell us the shape of the problem. A senior engineer reads it and replies. You won't get a templated capability deck.

Reply within one business day
Every engineer signs an NDA before day one
You own the code from the first commit
You interview the engineers before committing