RAG chatbotdevelopment for assistants that answer from your own content, and admit it when they can't.

We build chatbots that look up the answer in your help center, policies, product docs and tickets before they reply. Every answer links to its source. When the content doesn't cover the question, the bot says so and passes the conversation to a person with the full context.
Discuss your chatbot

A chatbot is only as good as what it does when it doesn't know.

A language model on its own will often answer a question even when it has no facts for it. A RAG-based chatbot first retrieves passages from your content and is instructed to write the reply from those passages only. The engineering work is in the cases around that: the question nobody documented, two articles that contradict each other, a customer who needs a person and not a paragraph. Those cases decide whether people keep using the bot.

Why company chatbots lose people's trust

01

Confident answers that are wrong

The bot invents a refund rule or a feature that doesn't exist, and a customer acts on it.
02

No way to check the answer

Replies come without a source, so agents and customers can't tell a correct answer from a plausible one.
03

Dead ends instead of handoff

The bot keeps rephrasing the same reply while the customer asks for a human for the third time.
04

Answers from outdated pages

An old pricing article or a retired policy is still in the index, and the bot quotes it as current.
05

Everyone sees everything

An internal bot answers from HR or finance documents that the person asking has no right to open.
06

Nobody knows how well it works

There is a count of conversations, but no measure of how many were answered correctly or where the bot failed.

Three bots, three different jobs

A support bot, a helpdesk bot and a sales assistant share the same retrieval core, but differ in content, permissions and what counts as a good answer.

Customer support bot

  • Answers from help center and product docs
  • Looks up order or account status through your API
  • Opens a ticket with the transcript attached

Internal helpdesk

  • HR, IT and process questions in Slack or Teams
  • Sees only documents the employee may open
  • Routes unanswered questions to the owning team

Sales assistant

  • Product, pricing and comparison questions
  • Answers from approved material only
  • Passes qualified leads to your CRM

In-product assistant

  • Lives inside your web or mobile app
  • Knows the user's plan and current screen
  • Links straight to the right setting or guide

Signs a RAG chatbot is worth building

A chatbot tends to pay off when the answers already exist in writing and people still have to ask for them.

1

The same questions fill the queue

A large share of tickets is answered by pasting a link to an article that already exists.

2

Your docs are good but nobody reads them

The help center has the answer, but search returns a list of pages and people give up.

3

New hires ask in chat all day

Senior people answer the same process and policy questions in Slack or Teams every week.

4

Sales waits on product experts

Reps can't answer a technical or pricing question on a call without pinging an engineer.

5

A scripted bot ran out of scripts

Your decision-tree bot handles a handful of flows and sends everything else to a form.

6

A generic AI bot embarrassed you

You tried a model with a prompt and no retrieval, and it made things up in front of customers.

What we build

Everything a RAG AI chatbot needs to go live

Content audit and ingestion

We connect your help center, wiki, PDFs and ticket history, remove duplicates and outdated pages, and split the rest into passages the bot can retrieve.

Retrieval tuned on your questions

Keyword and vector search combined, with reranking where it helps, tested against real questions your customers or staff have asked.

Answers with citations

Each reply is written from the retrieved passages and links to the articles it used, so anyone can open the source and check.

"I don't know" behavior

When retrieval finds nothing relevant, the bot says it has no answer and offers the next step. It does not fill the gap with a guess.

Handoff to a human

Rules for when to escalate, and a transfer to your help desk or live chat that carries the conversation and the sources the bot looked at.

Channels

A website widget, an assistant inside your web or mobile app, a Slack or Teams bot, all served by one backend and one knowledge base.

Permissions and safety

Retrieval is filtered by what the user is allowed to see. We test the bot against prompt injection and attempts to pull out other people's data.

Quality dashboard

A test set of real questions that runs on every change, plus a view of unanswered questions, escalations and feedback from live conversations.

What happens between a question and an answer

Three decisions the bot makes on every message. Each one is designed, tested and visible in logs.

Find

Rewrites the question using the conversation so far

Searches only content this user may see

Prefers current pages over archived ones

Decide

Checks that the passages actually cover the question

Asks a clarifying question when the request is vague

Declines topics you have ruled out, such as legal advice

Answer or hand off

Replies from the passages and cites them

Says it doesn't know when the content is missing

Transfers to a person with the full transcript

Technology for a RAG-based chatbot

A Python backend for retrieval and generation, React and TypeScript for the widget and admin screens. The model provider and the vector store are chosen with you per project: a hosted model or one you run yourself, vector search inside PostgreSQL or a dedicated vector database.

Python
FastAPI
PostgreSQL
TypeScript
React
Node.js
AWS
Docker
Who is this for

For teams whose answers already exist in writing

Support leaders

You want fewer repeat tickets without customers getting stuck in a bot that won't let them through.

SaaS product teams

You want an assistant inside the product that knows your docs and the user's account.

Operations, HR and IT

You answer the same internal questions every week and the wiki isn't solving it.

Sales and success teams

You need accurate product answers during a call, taken from approved material.

Where are you now?

No bot yet

Find out if your content can support one, and what it would take.

Replacing a scripted bot

Keep the flows that work, add answers from your content.

A prototype that makes things up

Add retrieval, citations and refusal rules to a bot that guesses.

Adding a channel

Bring a working website bot into your app, Slack or Teams.

Connecting your help desk

Handoff, ticket creation and account lookups through your APIs.

Internal bot with access rules

Answers that respect who may read which document.

How a RAG chatbot project runs

01

Questions and content

We collect real questions from tickets and chat logs, review the content that should answer them, and list the gaps where no answer is written down.

02

Test set and prototype

We agree on a set of questions with expected answers, then build a working bot on a slice of your content and measure it against that set.

03

Build

Full ingestion, retrieval, citations, refusal and handoff rules, the channel clients and the integration with your help desk or CRM.

04

Pilot

A limited release to your own team or a share of traffic. We read the transcripts with you and fix what the test set missed.

05

Launch and upkeep

Rollout to everyone, with content sync on a schedule and the test set run before each change to prompts, models or content structure.

How we work

Two ways to start

Discovery Sprint

most popular

2-week fixed-price start

Fixed price.

For teams that want to see the bot answer their own questions before committing to a full build.

Review of your content and its gaps

Test set built from real questions

Prototype bot on a slice of your docs

Measured results and failure examples

Scope and estimate for the full build

Start with discovery

Dedicated team

Engineers on your chatbot from build to launch

Monthly, team-based.

For a production chatbot with several channels, integrations and ongoing improvement after launch.

Python and AI engineers

Frontend and mobile developers for the clients

QA that tests answers, not only screens

Regular demos with transcript reviews

Team size adjusted as scope changes

Discuss your team

AI products we've built and rescued

Data MANAGEMENT & payroll

AI Payroll Platform (NDA)

Europe

An AI-powered payroll validation platform that extracts data from salary slips, verifies payroll calculations, and automates reporting and approval workflows for HR and finance teams

Before
→
after
↓
Manual payroll validation
↑
17% fewer salary calculation errors
↓
Complex PDF extraction
↑
AI-powered PDF data extraction
↓
Manual approval workflows
↑
Automated payroll validation and reporting workflows
↓
 Limited processing scalability
↑
Scalable platform for payroll processing
AI Commerce PlatformE

QLode

USA
Europe

An AI-powered fashion commerce platform that helps retailers deliver personalized shopping experiences through virtual styling, AI recommendations, image search, and intelligent product discovery.

Before
→
after
↓
AI search didn't scale
↑
AI-based recommendation engine developed
↓
Scalable infrastructure needed
↑
Image & text search implemented
↓
Complex retailer integrations
↑
Multi-retailer integration architecture built
↓
Product discovery wasn't production-ready
↑
High-performance backend for AI-driven flows
AI CONSUMER APPS

AI Mobile Editors

Global
4M+
DOWNLOADS COMBINED
Before
→
after
↓
Existing  codebase required stabilization
↑
Both apps stayed instore
↓
AI features broken or misleading
↑
AI rebuilt to production quality
↓
App Store compliance at risk
↑
App Store compliance restored
↓
Reviews declining fast
↑
Product stabilized 

What clients say about working with Gilzor

Verified reviews from Clutch. The products differ, the way we work does not.

“They were incredibly fast and efficient at scoping the project and then delivered within very tight deadlines.”
Clement Nevoret CEO, Pointblank GmbH Mobile app development · $10,000 to $49,999 Verified review on Clutch
“I was impressed with how quickly we got a stable and well-designed product.”
Natalia Burakova Senior Product Manager, Impala Studios Mobile app development and support · $200,000 to $999,999 Verified review on Clutch
“The team met all commitments, aligning with our company's objectives.”
Verified client Individual entrepreneur, IT company Mobile app, API and UX/UI design · $50,000 to $199,999 Verified review on Clutch

The people you will talk to

Art Scherbakov
Art ScherbakovCo-Founder
Andrew Laminsky
Andrew LaminskyCTOLinkedIn
Yuri Rudenya
Yuri RudenyaHead of Mobile Development at GilzorLinkedIn
Alena Timofeeva
Alena TimofeevaProduct Marketing LeadLinkedIn

Make the most of the experienced team

We are a global team of
creative
and
strategic thinkers
who specialize in building custom digital products
from scratch. Our main goal is to
deliver high-quality solutions
that meet our clients' needs.
We are a global team of
creative
and
strategic thinkers
who specialize
in building custom digital products
from scratch. Our main goal is to
deliver high-quality solutions
that
meet our clients' needs.
Learn more
85%
recurring customers
12M
the biggest fundraising round by one startup
X3 MRR
growth of partner's business in 5 mos
2 weeks
for project start
5+ years
av. partnership duration with SMBs and product companies

Why Gilzor

A chatbot is a product, not a model call: clients on several channels, a backend, integrations and content that changes every week. We build all of those parts in one team.

What we bring

AI and app engineering together

We build web, mobile and backend products and the AI features inside them, so the widget, the API and the retrieval come from one team.

AI work on real documents

On an AI payroll platform we built, data extraction from salary slips with automated validation led to 17% fewer salary calculation errors.

Track record

70+ products launched for startups, SMBs and product companies. 85% of clients come back.

Verified reviews

Rated 5.0 on Clutch from 5 verified reviews.

Quick start

Projects can start in about two weeks.

What makes us different

Measured before it ships

You see results on a test set of your own questions, not a demo on hand-picked ones.

Refusal is a feature

We design and test what the bot does when it has no answer, and treat a wrong answer as a bug.

Handoff from day one

The path to a human is part of the first version, not something added after complaints.

Honest about your content

If your docs can't support a bot yet, we tell you which articles to write first.

Overlap with US hours

Our team in Europe overlaps with part of the US working day.

What our clients
frequently ask

What does RAG chatbot development include?

Preparing and indexing your content, building the retrieval and answer logic, citations, rules for refusing and for handing off to a person, the chat clients for your channels, integrations with your help desk or CRM, and a test set that measures answer quality. You can hire us for the whole chatbot or for the backend only, if you already have a chat interface.

How is an AI chatbot with RAG different from a regular AI chatbot?

A regular model answers from what it learned in training, which usually doesn't include your internal policies, current prices or product details. With RAG, the bot searches your content for each question and writes the reply from the passages it found. That makes answers checkable, because each one points to a source, and updatable, because once an updated article is re-indexed, the answer changes without retraining anything.

Will the chatbot still make things up?

Retrieval lowers the risk but does not remove it. We reduce it further by instructing the model to answer only from retrieved passages, by refusing when nothing relevant is found, and by testing on questions your content cannot answer. Citations let a reader verify what remains.

How does handoff to a human work?

We agree on the triggers with you: the user asks for a person, the bot has no answer, the topic is on your list of sensitive ones, or the user repeats the question. The conversation then moves to your live chat or becomes a ticket in your help desk, with the transcript and the sources attached, so the agent doesn't ask the customer to start over.

Which channels can the bot run on?

A widget on your website, an assistant inside your web or mobile app, and bots for Slack or Microsoft Teams are the common ones. All of them call the same backend, so answers and permissions stay consistent and you maintain one knowledge base.

What content do we need before we start?

Written answers to the questions people ask: help articles, product docs, policies, internal wiki pages, resolved tickets. It doesn't have to be tidy. Part of the first two weeks is finding duplicates, outdated pages and questions with no written answer, and you get that list whether or not you continue with the build.

How is a RAG chatbot priced, and what does it cost to run?

The Discovery Sprint is a fixed price. The build is either a fixed price for an agreed scope or a monthly dedicated team. Running costs are separate and paid to your providers: model usage that grows with the number and length of conversations, plus hosting. We estimate both from your expected volume during discovery and design the bot to keep them down, for example by sending the model only the passages it needs.

Who can see our data, and can the bot leak restricted documents?

We agree upfront where content is stored, which model provider may process it and who on our side has access. For internal bots, each document keeps its access rules in the index and retrieval is filtered by the user's identity, so the model does not receive a passage the user may not read. We also test the bot with prompts written to get around those rules.

No sales pitch

Tell us what your chatbot should answer

Describe who will ask, where your content lives and which channel you need first. We'll reply with an approach and a quote. If your content isn't ready for a bot, we'll tell you what to fix first.

Next, a few optional questions so the first call is useful. We use your details only to reply to your request. Privacy Policy