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$
USD
I will develop a custom ai chatbot or ai assistant app with openai gpt
Sohel Rana
About this gig
I lead a 20+ engineer team that has shipped AI assistant apps to 100,000+ users and a GPT-powered iOS app rated 4.7 across 52,000 reviews. I build AI chatbots that survive real traffic, not demos.
WHAT YOU GET
- A chatbot trained on YOUR content, not generic answers
- - RAG so it cites your docs instead of hallucinating
- - Deployed to your website, app, WhatsApp, Telegram or Slack
- - Admin panel to update the knowledge base without code
- - Full source code. You own everything.
WHY THIS MATTERS
Most AI chatbots fail two ways: they make things up, and they cost more every month. RAG grounds every answer in your documents, and I architect caching and model routing so your inference bill stays predictable as you grow.
STACK
OpenAI GPT-4o, Claude, DeepSeek, LangChain, Node.js, TypeScript, React, Python. Deployed on AWS, Azure or GCP.
BEFORE YOU ORDER
Message me with what your bot must do and what content it learns from. I will tell you honestly which package fits, or if you do not need one at all.
17+ years engineering. TDD by default.
Get to know Sohel Rana
Sohel Rana
CEO and Founder
- FromBangladesh
- Member sinceAug 2026
- Avg. response time1 hour
Languages
Bengali, English
Software engineer turned founder - 19+ years building products companies actually run on. I lead NerdDevs, a 20+ engineer team shipping AI-powered apps, EdTech/LMS platforms, SaaS and mobile products for clients across the US, Europe and Asia.
I also build and operate my own multi-tenant platforms - an LMS for coaching centres, a CRM with call recording, a project management tool - so I know what it takes to run software, not just ship it.
Stack: TypeScript, Node.js, React, Next.js, Vue, MongoDB, AWS/Azure/GCP. TDD by default.
Tell me the business problem, not the feature list.
My Portfolio
FAQ
Who pays for the OpenAI API usage?
You do, on your own API key, so you keep full control and pay cost price. I will size the expected monthly spend before we start and design caching and model routing to keep it low.
Do I get the source code and can my team maintain it?
Yes, full source code in every package, with a README and handover call. It is standard TypeScript and Node.js, not a locked no-code platform, so any competent developer can take it over.
