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.
I Will Build a Custom AI Chatbot, LLM Agent or RAG Application
A thorough discovery session to map out your chatbot architecture, platform integrations, and data requirements. You receive a written proposal and technical recommendation you can act on immediately — whether with us or independently.
- Detailed 1-to-1 consultation
- Written architecture recommendation
- Platform and integration advice
- Technology stack guidance
- Source notes and next-steps document
A fully functional intermediate AI chatbot with LLM integration and RAG — built, tested, and delivered with source code. Ideal for businesses that need a capable, knowledge-aware bot live quickly.
- Everything in Consultation
- AI LLM model integration (GPT / Gemini / Anthropic)
- Retrieval-Augmented Generation (RAG) pipeline
- User authentication
- Multi-language support
- Platform integration (website, WhatsApp, Slack, etc.)
- Full source code delivered
End-to-end build, deployment, and one month of post-launch support. Includes CRM or database integration and full production deployment — the complete solution for teams that want zero technical headaches.
- Everything in Chatbot Build
- CRM and database integration
- Production deployment support
- One month post-launch maintenance
- Priority order chat support
- Full source code and setup documentation
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Full Description
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 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 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.
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Compare Packages
| Feature | Consultation | Chatbot Build | Full Deployment |
|---|---|---|---|
| Delivery Time | 1 days | 7 days | 14 days |
| Revisions | 0 | 1 | 2 |
| Detailed 1-to-1 consultation | ✓ | ✕ | ✕ |
| Written architecture recommendation | ✓ | ✕ | ✕ |
| Platform and integration advice | ✓ | ✕ | ✕ |
| Technology stack guidance | ✓ | ✕ | ✕ |
| Source notes and next-steps document | ✓ | ✕ | ✕ |
| Everything in Consultation | ✕ | ✓ | ✕ |
| AI LLM model integration (GPT / Gemini / Anthropic) | ✕ | ✓ | ✕ |
| Retrieval-Augmented Generation (RAG) pipeline | ✕ | ✓ | ✕ |
| User authentication | ✕ | ✓ | ✕ |
| Multi-language support | ✕ | ✓ | ✕ |
| Platform integration (website, WhatsApp, Slack, etc.) | ✕ | ✓ | ✕ |
| Full source code delivered | ✕ | ✓ | ✕ |
| Everything in Chatbot Build | ✕ | ✕ | ✓ |
| CRM and database integration | ✕ | ✕ | ✓ |
| Production deployment support | ✕ | ✕ | ✓ |
| One month post-launch maintenance | ✕ | ✕ | ✓ |
| Priority order chat support | ✕ | ✕ | ✓ |
| Full source code and setup documentation | ✕ | ✕ | ✓ |
Extra Information
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Frequently Asked Questions
You receive full ownership of all source code, configuration files, and setup documentation. Nothing is locked to our infrastructure — you can host and modify everything independently.
The Chatbot Build tier includes 1 revision and Full Deployment includes 2 revisions. Revisions cover adjustments within the agreed scope. If your requirements change significantly mid-project, we will discuss the impact transparently via order chat before proceeding.
Full Deployment clients receive one month of post-launch maintenance as standard. Additional months of support can be added via the add-on. Consultation and Chatbot Build clients can also purchase the support add-on separately.
This add-on delivers an AI voice agent capable of making and handling phone calls — built using Twilio and Vapi. It can be configured for outbound cold calling, appointment setting, or inbound call handling, and integrates with your existing chatbot or CRM.
We apply advanced Natural Language Processing (NLP) techniques and fine-tune prompting and retrieval strategies so the chatbot responds contextually and coherently. During testing we run edge-case scenarios to catch awkward or off-brand responses before launch.
We integrate with websites, WhatsApp, Facebook, Instagram, Slack, Discord, Telegram, Twilio, Vapi, and more. If you have a specific platform in mind, please mention it during consultation and we will confirm compatibility.
Please share your business goals, the platforms you want the chatbot on, any existing data sources or documents it should reference, and any CRM or database it needs to connect to. The more detail you provide upfront, the faster we can begin.
Every AI project has unique variables — data sources, platforms, compliance requirements, and scale. A quick conversation ensures we select the right tier, set accurate expectations, and hit the ground running from day one.
Customer Reviews
See what our customers say about this Zinn
Neil was very easy to work with. Very creative, has exceptional attention to detail and was able to brainstorm the project with me and made recommendations that made the system even better than planned. Look forward to continuing to work with Neil.
I've worked with a few AI freelancers before, but this one is different. They didn't just complete the task, they actually took the time to understand what I was trying to achieve and suggested better approaches I hadn't even considered. The quality of work was excellent, communication was clear and prompt, and they explained technical stuff in a way that finally made sense to me. If you need AI work done right the first time without the back-and-forth headaches, this is your person. Seriously, don't overthink it, just hire them.
Neil and his team are great to work with. Initially, aligning on the project details took some time, as is common with new projects. Once they understood the industry context and project specifics, the workflow became very smooth. They excel in communication, responding promptly and adapting quickly to changes. They are highly skilled and knowledgeable in their field. If you need assistance with Langchan, AI orchestration, or developing conversational AI bots, they are well-equipped to help. They can integrate solutions with your existing systems or any third-party CRMs or even develop a native solution from scratch. I highly recommend them and plan to continue doing business with them.
Great cooperation and teamwork! Neil is very knowledgeable in AI chatbots and automations. He quickly grasped the project brief and went above and beyond with the ideas and implementations! Highly recommended!!!
Went above and beyond, work was done to a great standard. Implemented additional features without any extra cost. Great on time and reccomend.
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