You will get a custom RAG application using Python, LangChain, and OpenAI
Project details
You will get a custom RAG application built with Python, LangChain, and OpenAI that allows users to upload documents, search knowledge, and receive accurate, context-aware answers with source citations.
I can handle the complete RAG development process, including document ingestion, text chunking, embeddings, vector database setup, semantic search, prompt workflows, AI chat, source references, authentication, backend APIs, and deployment.
Your application can support PDFs, DOCX files, text files, websites, or other business data sources. Depending on the selected package, it may also include conversation history, metadata filtering, multiple document collections, user roles, an admin dashboard, analytics, and cloud deployment.
I focus on building reliable and maintainable RAG systems that retrieve the most relevant information before generating an answer, helping reduce hallucinations and improve transparency.
Please share your data sources, required features, expected users, and preferred interface before ordering so I can confirm the most suitable package and technical approach.
I can handle the complete RAG development process, including document ingestion, text chunking, embeddings, vector database setup, semantic search, prompt workflows, AI chat, source references, authentication, backend APIs, and deployment.
Your application can support PDFs, DOCX files, text files, websites, or other business data sources. Depending on the selected package, it may also include conversation history, metadata filtering, multiple document collections, user roles, an admin dashboard, analytics, and cloud deployment.
I focus on building reliable and maintainable RAG systems that retrieve the most relevant information before generating an answer, helping reduce hallucinations and improve transparency.
Please share your data sources, required features, expected users, and preferred interface before ordering so I can confirm the most suitable package and technical approach.
Programming Languages
PythonWhat's included
| Service Tiers |
Starter
$700
|
Standard
$1,500
|
Advanced
$3,000
|
|---|---|---|---|
| Delivery Time | 7 days | 14 days | 25 days |
Number of Revisions | 1 | 2 | 3 |
Number of Pages | 2 | 5 | 8 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code | - | - | - |
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AR
Ahmad R.
Aug 17, 2026
Python FastAPI Developer for AI Agent & Workflow Automation Backend
Ahsen did an excellent job on the FastAPI backend. He understood the requirements quickly and delivered clean, well-structured work with solid API integration, AI workflow handling, PostgreSQL, Redis, and Docker setup.
Communication was clear throughout the project, and he was proactive in handling technical details without needing constant guidance. Everything was delivered as expected, and the backend was easy to understand and work with.
I’d definitely recommend Ahsen for Python, FastAPI, AI integration, and backend development projects. I would be happy to work with him again.
Communication was clear throughout the project, and he was proactive in handling technical details without needing constant guidance. Everything was delivered as expected, and the backend was easy to understand and work with.
I’d definitely recommend Ahsen for Python, FastAPI, AI integration, and backend development projects. I would be happy to work with him again.
AF
Anthony F.
Oct 21, 2022
Help with a console application
About Ahsen
Python Developer | Django Developer | AI Developer
Copenhagen, Denmark - 8:30 pm local time
I’m a Sr. Python Developer, Django Developer and AI Developer specializing in production-ready backend applications, SaaS platforms, REST APIs, AI-powered apps, LLM integrations, and RAG systems.
I build secure and scalable Python applications using Django, FastAPI, Flask, PostgreSQL, Redis, Celery, Docker, and AWS, while integrating AI technologies such as OpenAI, Claude, LangChain, LlamaIndex, embeddings, and vector databases.
Whether you need a Django SaaS application, Python backend, REST API, AI application, private document assistant, RAG system, or an existing backend improved, I can take the project from architecture and development through integration and deployment.
Python & Django Development
- I build reliable backend applications and web platforms using Python and Django with a strong focus on maintainability, security, performance, and scalability.
✔ Python Development
✔ Django Development
✔ Django REST Framework
✔ FastAPI Development
✔ Flask Development
✔ SaaS Backend Development
✔ REST API Development
✔ PostgreSQL & MongoDB
✔ Authentication & Authorization
✔ Admin Dashboards
✔ Third-Party API Integrations
✔ Webhooks
✔ Celery & Redis
✔ Backend Debugging & Optimization
✔ AWS & Docker Deployment
Django & Backend Development
- I develop backend systems for SaaS products, dashboards, marketplaces, internal platforms, ecommerce applications, and API-driven web applications.
✔ Django Web Applications
✔ Django REST APIs
✔ Backend Architecture
✔ Database Design
✔ User Authentication
✔ Role-Based Access Control
✔ Payment Integrations
✔ Business API Integrations
✔ Background Processing
✔ Database Optimization
✔ Existing Django Application Improvements
✔ Production Deployment
AI Development & LLM Integration
- I build practical AI applications that connect language models with business data, documents, APIs, databases, and existing workflows.
✔ AI Application Development
✔ OpenAI API Integration
✔ Claude API Integration
✔ LLM Applications
✔ AI SaaS Development
✔ AI Chatbots
✔ AI Assistants
✔ AI Agents
✔ Prompt Engineering
✔ LangChain
✔ LlamaIndex
✔ AI Workflow Automation
✔ AI Features for Existing Applications
RAG & AI Knowledge Systems
- I develop Retrieval-Augmented Generation systems that allow AI applications to securely search, retrieve, and answer questions using private or business-specific information.
✔ RAG Development
✔ Document Chatbots
✔ AI Knowledge Bases
✔ Semantic Search
✔ Vector Search
✔ Document Processing
✔ Embeddings
✔ PDF & Document Retrieval
✔ Pinecone
✔ Weaviate
✔ Qdrant
✔ PostgreSQL / pgvector
✔ Private Data AI Applications
Relevant Project Experience
Python & Django SaaS Platform — developed scalable backend functionality using Python, Django, PostgreSQL, REST APIs, authentication, and third-party integrations.
FastAPI Backend Application — built high-performance APIs, business logic, database integrations, webhooks, validation, and secure application workflows.
AI & RAG Application — developed document retrieval, AI search, chatbot, and knowledge-base functionality using OpenAI, LangChain, embeddings, and vector databases.
AI Workflow Automation — integrated LLMs with APIs, business data, background tasks, and existing workflows to automate structured processes.
Production Backend Systems — worked with Celery, Redis, PostgreSQL, Docker, AWS, APIs, and cloud infrastructure for scalable production applications.
⭐Core Technologies
Python, Django, Django REST Framework, FastAPI, Flask, PostgreSQL, MongoDB, Redis, Celery, REST APIs, OpenAI API, Claude API, LangChain, LlamaIndex, RAG, embeddings, vector databases, Pinecone, Weaviate, Qdrant, pgvector, Docker, AWS, React, Next.js
Why Clients Hire Me
✔ Python, Django & Backend Development Expertise
✔ Production-Ready SaaS Application Development
✔ REST API & Third-Party Integration Experience
✔ AI, LLM & RAG Application Development
✔ PostgreSQL & Database Development
✔ Celery & Redis Background Processing
✔ Existing Python & Django Application Improvements
✔ Secure and Maintainable Backend Architecture
✔ AWS, Docker & Production Deployment
✔ Clear Communication & Reliable Delivery
✔ Full Ownership From Architecture to Deployment
I focus on building Python and AI applications that are reliable, maintainable, scalable, and ready for real users rather than demos that need to be rebuilt before production.
Whether you need a Python Developer, Django Developer, AI Developer, FastAPI Developer, Backend Developer, RAG Developer, or AI SaaS Developer, send me your requirements, existing application, or current technical challenge.
I’ll review what you need and recommend the most practical way forward.
SEO Keywords: Python Developer, Django Developer, AI Developer, Python Backend Developer, Django REST Framework Developer, FastAPI Developer, Backend Developer, SaaS Developer, AI App Developer, AI SaaS Developer, LLM Developer, RAG Developer, OpenAI
Steps for completing your project
After purchasing the project, send requirements so Ahsen can start the project.
Delivery time starts when Ahsen receives requirements from you.
Ahsen works on your project following the steps below.
Revisions may occur after the delivery date.
Requirements & Data Review
RAG Pipeline Development