---
title: "I Will Build a Custom AI Chatbot, LLM Agent or RAG Application"
url: https://zinnhub.com/zinns/ai-chatbot-gpt-rag-llm-ai-agent-ai-voice-bot-cold-call-ai-saas/
description: "London-based ML engineers with 5+ years' experience building bespoke AI chatbots, LLM agents, RAG pipelines, and voice bots — delivered worldwide to your exact requirements."
published: 2025-12-25T14:47:12+00:00
modified: 2026-10-19T17:40:54+00:00
language: en-GB
---

# I Will Build a Custom AI Chatbot, LLM Agent or RAG Application

Zinn Digital® specialises in end-to-end AI conversational solutions built by a Lead ML Engineer with a research background and 5+ years of hands-on machine learning experience. We have delivered 15+ production applications for clients across industries, and we are based in London, England.

Whether you need a straightforward customer-support chatbot, an enterprise RAG pipeline connected to your knowledge base, or an AI voice agent making outbound cold calls, we build it to your exact specification — cleanly coded, thoroughly tested, and ready to scale.

\*\*What We Build\*\*

— [Custom AI chatbots](https://zinnhub.com/zinns/develop-ai-chatbots-ai-agents-ai-websites-custom-gpt-apps/) for customer support, lead generation, and user engagement
 — Large Language Model (LLM) agents with tool-calling and memory
 — Retrieval-Augmented Generation (RAG) systems connected to your documents or database
 — AI voice bots for outbound cold calling and inbound handling (via Twilio and Vapi)
 — Multi-platform integrations: website, WhatsApp, Facebook, Instagram, Slack, Discord, Telegram, and more
 — CRM and database integrations for fully automated workflows
 — User authentication and multi-language support

\*\*Technology Stack\*\*

Flowise · Google AI / Gemini · Vertex AI (Agent Builder & Tools) · Google Cloud Services · Python · LangChain · OpenAI / Anthropic APIs · Twilio · Vapi · PostgreSQL / vector databases

\*\*How We [Build Your](https://zinnhub.com/zinns/build-your-custom-ai-website-rag-chatbot-or-gpt-app-python-langchain-ml-dl/) Chatbot\*\*

1. Consultation — We discuss your goals, audience, platforms, and data sources in detail before any code is written.
 2. Proposal — You receive a clear scope document outlining architecture, integrations, timeline, and deliverables.
 3. Development — Our ML engineer builds and iterates against the agreed spec, committing clean, documented code throughout.
 4. Testing — Functional, edge-case, and performance testing ensures the bot handles real-world conversations reliably.
 5. Handover — We deliver source code and setup documentation via the order manager. Premium clients also receive deployment support and one month of post-launch maintenance.

\*\*Why Choose Zinn Digital®?\*\*

— Research-grade ML expertise applied to practical business problems
 — Full source code ownership — you keep everything we build
 — Transparent communication via order chat at every stage
 — Worldwide delivery from a London-based studio
 — Ongoing support available for clients who need it

Please message us to discuss your requirements before placing an order — this ensures the right package is selected and we can hit the ground running from day one.