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Fiverr Pro
English
$
USD
I will build ai powered systems llm integrations, intelligent automation
Zellur Rahman
4.7
4.7
About this gig
With 8+ years of backend engineering experience and hands-on AI development, I specialize in building intelligent systems that solve real business problems. I have built AI-assisted workflows for enterprise platforms, developed document intelligence systems, and I am actively building SaaS products powered by LLMs.
Whether you need a simple ChatGPT API integration, a full RAG pipeline over your documents, or a multi-agent system that automates complex workflows I deliver clean, scalable, production-ready code with full documentation and source code handover.
What I can build for you
- RAG pipelines - document Q&A, knowledge base search, semantic retrieval over your data using Pinecone, ChromaDB, or pgvector
- AI agents & automation - LangChain, CrewAI, or custom agent frameworks with tool use and multi-step reasoning
- Document AI - intelligent document extraction, classification, OCR processing, and structured data output
- LLM API integration - OpenAI GPT-4, Anthropic Claude, Google Gemini, Mistral, or local models via Ollama
- AI microservices - Java Spring Boot or Python Flask backends with AI-assisted workflows, fully REST API documented
- AI SaaS products - Web Application
Get to know Zellur Rahman
Zellur Rahman
Software Engineer , Machine Learning , Java , Javascript , Python
- FromThailand
- Member sinceJun 2020
- Last delivery2 years
Languages
English, Bengali, German
Senior software engineer with 8+ years of backend experience, now specializing in production-grade AI systems. I build RAG pipelines, LLM-powered APIs, AI agents, document intelligence, and microservices with AI-assisted workflows — not just demos, but real deployable systems used at enterprise scale
FAQ
Do I need to send a message before ordering?
Yes — please send a custom quote request before placing an order. Every AI project is different in scope, data requirements, and complexity. Messaging me first allows me to confirm feasibility, recommend the right approach, and give you an accurate delivery timeline and price.
Which LLMs and AI models do you work with?
I work with all major LLM providers — OpenAI (GPT-4o, GPT-4 Turbo), Anthropic Claude, Google Gemini, Mistral, and open-source models via Ollama or HuggingFace. I will recommend the best model for your use case based on cost, latency, and capability requirements.
What is a RAG pipeline and do I need one?
RAG (Retrieval-Augmented Generation) allows an AI to answer questions based on your own documents, database, or knowledge base — instead of relying purely on the model's training data. If you want your AI to "know" your product data, internal docs or any custom content, you need a RAG pipeline
Will I receive the full source code?
Yes, always. You will receive the complete source code via a GitHub repository or ZIP file
What backend technology will you use?
For Python-based AI projects I use FastAPI or Flask. For enterprise Java projects I use Spring Boot. For full-stack AI SaaS products I use Next.js on the frontend with Python or Java on the backend. I will recommend the best stack for your project
Can you integrate AI into my existing system?
Yes. I can integrate AI features into your existing codebase without a full rewrite. Share your current stack and architecture details when you message me and I will assess the best integration approach
Do you handle cloud deployment?
Deployment is included in the Enterprise package and available as an add-on for Standard. I work with AWS (EC2, Lambda, S3), Azure (App Service, Azure AI), and Google Cloud. I also provide Docker and Docker Compose setup for all projects so you can deploy anywhere easily.
How do you handle data privacy and confidentiality?
I take data privacy seriously. I am happy to sign an NDA before starting work. For sensitive data, I can architect solutions that keep your data local — using on-premise vector databases and local LLMs via Ollama — so your data never leaves your infrastructure.
What if I am not satisfied with the delivery?
I offer revisions as part of every package (1 for Basic, 3 for Standard, unlimited for Enterprise). If something is not working as expected or does not match the agreed requirements, I will fix it within the revision period. I communicate throughout the project to avoid surprises at delivery
How long does a typical AI project take?
Timeline depends on complexity and how quickly you provide requirements and feedback. Rush delivery is available on request.
Reviews
23 reviews for this Gig
| (18) | ||
| (4) | ||
| (0) | ||
| (0) | ||
| (1) |
Rating Breakdown
- Seller communication level
- Recommend to a friend
- Service as described
Sort By
Most relevant
J jisan9
Canada
very quick and skilled seller. Delivered ahead of time. Really happy with his work
Helpful?S sandman8888
Singapore
Great communication and on time delivery
Helpful?A ashly2557
United States
Zellur delivered EXACTLY what I needed, He really knows his stuff, he delivered earlier than expected and was able to clarify and answer any questions I had. I will definitely reach out to him again. I didn't need any revisions which says a lot about how well of a job he did!
Helpful?W wale0_
United States
Amazing Work!
Helpful?M 
martinnasse
France
zellur is absolutely passionate about his job.. he knows exactly what he is supposed to do .. takes his time initially to understand the requirements and only if he is confident he takes up the project or doesn't hesitate to say he will pass it on .. great work .. we will work more in the future
Helpful?
Reviews
23 reviews for this Gig
| (18) | ||
| (4) | ||
| (0) | ||
| (0) | ||
| (1) |
Rating Breakdown
- Seller communication level
- Recommend to a friend
- Service as described
Sort By
Most relevant
J jisan9
Canada
very quick and skilled seller. Delivered ahead of time. Really happy with his work
Helpful?S sandman8888
Singapore
Great communication and on time delivery
Helpful?A ashly2557
United States
Zellur delivered EXACTLY what I needed, He really knows his stuff, he delivered earlier than expected and was able to clarify and answer any questions I had. I will definitely reach out to him again. I didn't need any revisions which says a lot about how well of a job he did!
Helpful?W wale0_
United States
Amazing Work!
Helpful?M martinnasse
France
zellur is absolutely passionate about his job.. he knows exactly what he is supposed to do .. takes his time initially to understand the requirements and only if he is confident he takes up the project or doesn't hesitate to say he will pass it on .. great work .. we will work more in the future
Helpful?
