Get a fully functional AI chatbot — web, mobile, or WhatsApp — built by senior London-based developers using OpenAI, RAG, and custom LLM integrations, with full source code ownership.
I Will Build a Custom AI Chatbot or WhatsApp AI Chatbot
A streamlined AI chatbot with essential core features, optimised for web, iOS, or Android. Perfect for MVPs and proof-of-concept builds.
- AI LLM model integration
- Pre-set conversational journey
- User authentication
- Full commented source code
- Web, iOS & Android compatible
Everything in Starter, plus Retrieval-Augmented Generation, multi-language support, and AI model training for a more capable, knowledge-driven chatbot.
- Everything in Starter
- Retrieval-Augmented Generation (RAG)
- Multi-language support
- AI model training & advanced classification
- Full commented source code
The full production-grade solution: RAG, multi-language support, CRM/database integration, and extensive data fine-tuning with a custom-trained LLM.
- Everything in Growth
- CRM / database integration
- Extensive data fine-tuning
- Custom LLM training
- Cloud deployment guidance (AWS or GCP)
- Full commented source code
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Value Position
AI Model Flexibility
Delivery Timeline
Ownership & Code Access
Scalability Path
What You'll Receive
Full Description
Looking for a senior AI software developer to build a smart, scalable chatbot for your web app, mobile app, or WhatsApp channel? You're in the right place.
We're senior AI chatbot developers at Zinn Digital™, based in London, England. We specialise in AI chatbot development, ChatGPT integration, custom LLM applications, WhatsApp AI chatbots, Botpress, Discord bots, Telegram bots, ManyChat automation, WhatsApp Business API, and AI SaaS solutions. We build smarter, faster platforms and seamlessly integrate AI into your existing software using OpenAI, Llama, Gemini, Deepseek, Whisper, n8n, Zapier, and Make.com.
**AI Services We Offer**
- AI Chatbot App Development (web, iOS & Android)
- AI Integrations and Fine-Tuning
- Custom GPT Applications
- Vapi AI or Bland Agent Call Bots
- AI Chatbot Development using OpenAI LLM and ChatGPT
- AI Applications in Healthcare (App and Website)
- Integrating Chatbots into Existing Systems
- Cloud-Based AI Deployment (AWS & GCP)
- AI SaaS Solutions
- WhatsApp AI Chatbot via WhatsApp Business API
**Why Choose Zinn Digital™?**
- Extensive AI, mobile, and web development expertise
- Full, commented source code delivered to you — you own it completely
- Fast communication and responsive support throughout the project
- Post-launch assistance available to keep things running smoothly
- Experience across healthcare, SaaS, e-commerce, and service businesses
**Our Three Tiers at a Glance**
- **Starter** — A streamlined AI chatbot with core features, ready in 4 days. Ideal for MVPs and proof-of-concept builds.
- **Growth** — Adds Retrieval-Augmented Generation (RAG), multi-language support, and AI model training for more capable, knowledge-driven bots.
- **Scale** — The full solution: RAG, multi-language support, CRM/database integration, and extensive data fine-tuning with a custom LLM — ideal for production-grade deployments.
**My Process**
1. **Discovery** — Once your order is placed and your requirements are submitted, we review your platform, LLM preferences, and integrations to scope the project precisely.
2. **Design & Architecture** — We map the conversational journey, data flows, and integration points before writing a single line of code.
3. **Development** — We build iteratively, keeping you updated through the order manager at each milestone.
4. **Testing & Refinement** — The chatbot is tested across target platforms and edge cases; revisions are addressed promptly.
5. **Handover** — You receive the full, commented source code, deployment notes, and a brief walkthrough via the order manager so your team can maintain and extend the bot confidently.
**Important Notes**
- Third-party API costs (e.g., OpenAI, WhatsApp Business API, Vapi) are the client's responsibility.
- WhatsApp Business API access requires approval by Meta; we guide you through this but cannot guarantee Meta's timeline.
- Scope changes after development begins may affect delivery time and price — these are agreed in writing before any extra work starts.
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Compare Packages
| Feature | Starter | Growth | Scale |
|---|---|---|---|
| Delivery Time | 4 days | 7 days | 10 days |
| Revisions | -1 | -1 | -1 |
| AI LLM model integration | ✓ | ✕ | ✕ |
| Pre-set conversational journey | ✓ | ✕ | ✕ |
| User authentication | ✓ | ✕ | ✕ |
| Full commented source code | ✓ | ✓ | ✓ |
| Web, iOS & Android compatible | ✓ | ✕ | ✕ |
| Everything in Starter | ✕ | ✓ | ✕ |
| Retrieval-Augmented Generation (RAG) | ✕ | ✓ | ✕ |
| Multi-language support | ✕ | ✓ | ✕ |
| AI model training & advanced classification | ✕ | ✓ | ✕ |
| Everything in Growth | ✕ | ✕ | ✓ |
| CRM / database integration | ✕ | ✕ | ✓ |
| Extensive data fine-tuning | ✕ | ✕ | ✓ |
| Custom LLM training | ✕ | ✕ | ✓ |
| Cloud deployment guidance (AWS or GCP) | ✕ | ✕ | ✓ |
Extra Information
My Process
Tools I Use
Perfect For
Frequently Asked Questions
Starter covers AI LLM integration, a pre-set conversational journey, user authentication, and full source code — great for MVPs. Growth adds Retrieval-Augmented Generation (RAG), multi-language support, and AI model training. Scale adds CRM/database integration, extensive data fine-tuning, and custom LLM training for production-grade deployments.
Yes. Post-launch assistance is available to ensure everything runs smoothly after deployment. You can add a 30-day support package as an add-on when placing your order.
Third-party API subscription and usage costs (e.g., OpenAI, WhatsApp Business API, Vapi) are the client's responsibility. We'll advise you on which services are needed and their likely costs before work begins.
Yes. WhatsApp AI chatbots require access to the WhatsApp Business API, which is managed and approved by Meta. We guide you through the setup process, but Meta's approval timeline is outside our control. We recommend starting the application early.
We scope the project carefully at the start using your requirements. If additional features or changes arise during development, we discuss the impact on timeline and price openly and agree everything in writing via the order manager before proceeding — no surprise charges.
Absolutely. You will receive 100% ownership of the fully documented, commented source code across all tiers. There are no licensing restrictions or ongoing fees from us.
Yes. We specialise in seamlessly integrating AI features — including chatbots, LLMs, and automation workflows — into your existing mobile app, web software, or business tools.
Yes. We can deploy your AI chatbot securely on AWS or GCP. Cloud deployment guidance is included in the Scale tier and available as an add-on for Starter and Growth orders.
Customer Reviews
See what our customers say about this Zinn
We've worked with them for multiple years, and the app has been very successful for us.
I have been working with Neil and his team on an ongoing MVP project and I am very happy with the quality of work, professionalism, competency and flexibility from everyone involved. I would certainly recommend them to other start-up owners who need to get a product off the ground with a highly able team.
Absolutely delighted with the work Assort Tech delivered. The entire team worked professionally and delivered a great product really quickly. Excited to work with them in the future! Thank you!
Working with Assort Tech as a Web Developer has been an exceptional experience. Their team demonstrates a rare combination of technical expertise, clear communication, and a genuine commitment to quality. Every stage of the development process was handled with professionalism and efficiency, making collaboration smooth and productive. Assort Tech consistently provided valuable insights, innovative solutions, and timely support, all of which contributed to a seamless workflow and a successful web development outcome. I truly appreciate their dedication and the trust they placed in my work. I’m genuinely excited about the next phase of our collaboration and look forward to the development of the mobile app and the continued progress of our project. With the strong foundation we’ve built together, I’m confident the final product will be outstanding. Highly recommended for anyone seeking a reliable and forward-thinking tech partner!
Highly professional, easy communication and a willingness to work together to find solutions that work for both parties.
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