You will get Build AI Full Stack Applications | FastAPI Backend + Next.js Frontend
Project details
š AI-POWERED FULL STACK DEVELOPMENT | FastAPI + Next.js + LLM
Are you looking to build a smart, AI-powered web application?
I specialize in end-to-end AI full stack development ā from
intelligent backends to modern, responsive frontends.
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š§ WHAT I BUILD
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ā AI Chatbots & Assistants (ChatGPT, Claude, Gemini API)
ā Agentic AI Systems (LangChain, CrewAI, AutoGen)
ā FastAPI REST APIs with AI/ML model integration
ā Next.js frontends with real-time AI features
ā RAG (Retrieval-Augmented Generation) systems
ā Document Q&A, Image AI, and Data Analysis tools
ā AI SaaS MVPs and Prototypes
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š ļø MY TECH STACK
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Frontend ā Next.js, React, Tailwind CSS
Backend ā FastAPI, Python, REST & WebSockets
AI/LLM ā OpenAI, Anthropic Claude, LangChain,
LlamaIndex, FastAI
Database ā PostgreSQL, MongoDB, Supabase, Pinecone
Deploy ā Vercel, Railway, AWS, Docker
Are you looking to build a smart, AI-powered web application?
I specialize in end-to-end AI full stack development ā from
intelligent backends to modern, responsive frontends.
āāāāāāāāāāāāāāāāāāāāāāāā
š§ WHAT I BUILD
āāāāāāāāāāāāāāāāāāāāāāāā
ā AI Chatbots & Assistants (ChatGPT, Claude, Gemini API)
ā Agentic AI Systems (LangChain, CrewAI, AutoGen)
ā FastAPI REST APIs with AI/ML model integration
ā Next.js frontends with real-time AI features
ā RAG (Retrieval-Augmented Generation) systems
ā Document Q&A, Image AI, and Data Analysis tools
ā AI SaaS MVPs and Prototypes
āāāāāāāāāāāāāāāāāāāāāāāā
š ļø MY TECH STACK
āāāāāāāāāāāāāāāāāāāāāāāā
Frontend ā Next.js, React, Tailwind CSS
Backend ā FastAPI, Python, REST & WebSockets
AI/LLM ā OpenAI, Anthropic Claude, LangChain,
LlamaIndex, FastAI
Database ā PostgreSQL, MongoDB, Supabase, Pinecone
Deploy ā Vercel, Railway, AWS, Docker
Programming Languages
JavaScript, Python, TypeScriptCoding Expertise
Cross Browser & Device Compatibility, Performance Optimization, DesignWhat's included
| Service Tiers |
Starter
$100
|
Standard
$250
|
Advanced
$500
|
|---|---|---|---|
| Delivery Time | 5 days | 10 days | 30 days |
Number of Revisions | 3 | 5 | Unlimited |
Design Customization | |||
Content Upload | |||
Responsive Design | |||
Source Code |
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TM
Tom M.
Feb 21, 2026
eBay Search App Development
harsh helped build an app with great success, took feedback well and executed on changes quickly!
TM
Tom M.
Feb 12, 2026
eBay Search Tool
Harsh was able to build a web app from the ground up, using multiple data sources. There were tech challenges along the way that were expected and Harsh was able to research them and figure out ways to allow the systems to work properly. He was very resourceful and committed to creating a great visual product. He completed things in a timely manner and would send daily updates of his progress towards the finish line.
About Harsh
Full-Stack Developer & Systems Architect | React, FastAPI | Blockchain
New Delhi, IndiaĀ - 2:53 am local time
A lot of systems work well in controlled environments but start failing under **real traffic, unreliable APIs, or concurrency pressure**. My work has consistently focused on stabilizing such systems and making them behave predictably in production.
I focus less on quick implementations and more on building systems that can **run reliably without constant intervention**.
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š„š²š¹š²šš®š»š šš š½š²šæš¶š²š»š°š²:
ā š²šš®š š¦š²š®šæš°šµ šš“š“šæš²š“š®šš¼šæ š¦š®š®š¦
Built and deployed a scalable platform using **React, FastAPI, AWS, Docker, and NGINX**, designed to handle large volumes of data with consistent performance.
ā šš¹š“š¼šæš¶ššµšŗš¶š° š§šæš®š±š¶š»š“ š¦šššš²šŗš
Developed and maintained trading bots (**Binance & DHAN**) handling real capital. Focused on **low-latency execution, async processing, and API reliability**.
ā šš»šš²šæš½šæš¶šš² šš„ š¦š®š®š¦
Worked for 2+ years on a production **C# .NET backend** used across Ireland. Involved in **API development, performance tuning, and resolving live issues**.
ā šŖš²šÆšÆ / š£šæš²š±š¶š°šš¶š¼š» š š®šæšøš²š š¦šššš²šŗš
Experience with **wallet-based authentication, CLOB interactions, and on-chain data handling**. Built systems requiring **precise state management and consistent execution**.
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šš¼šæš² š¦šš®š°šø:
šš®š°šøš²š»š±: FastAPI, Django, C# .NET, Node.js
ššæš¼š»šš²š»š±: React.js, Next.js
šš®šš®šÆš®šš²š: PostgreSQL, MongoDB, Redis
šš»š³šæš®šššæšš°šššæš²: AWS, Docker, NGINX
šššš¼šŗš®šš¶š¼š»: Python, Selenium, BeautifulSoup, n8n
šŖš²šÆšÆ: ethers.js, web3.py
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I am typically brought in when systems need to be **made reliable**, or when something that works in development needs to be **made production-ready**.
Steps for completing your project
After purchasing the project, send requirements so Harsh can start the project.
Delivery time starts when Harsh receives requirements from you.
Harsh works on your project following the steps below.
Revisions may occur after the delivery date.
Developement