You will get AI Web App Development | GPT-4, LangChain & RAG | React & Node.js
Project details
⚡ Add real AI to your web app — not a chatbot widget, but a feature built into your product's core.
I build AI-powered web applications using GPT-4, LangChain, and RAG architecture. Smart dashboards, document analysis tools, AI automation features, and intelligent SaaS products — built production-ready.
I've integrated OpenAI API into 10+ web products. I know which AI approach fits which problem — and I'll tell you if a simpler solution works better.
What I build:
✅ GPT-4 / GPT-4o integration inside your web app
✅ RAG systems — AI trained on your own documents and data
✅ LangChain agents for multi-step AI workflows
✅ OpenAI Whisper for voice and transcription features
✅ AI-powered analytics and smart recommendations
✅ Streaming responses for real-time AI UX
✅ 30 days free support after launch
Tech: React · Node.js · OpenAI API · LangChain · Pinecone · PostgreSQL · Supabase · Vercel
I build AI-powered web applications using GPT-4, LangChain, and RAG architecture. Smart dashboards, document analysis tools, AI automation features, and intelligent SaaS products — built production-ready.
I've integrated OpenAI API into 10+ web products. I know which AI approach fits which problem — and I'll tell you if a simpler solution works better.
What I build:
✅ GPT-4 / GPT-4o integration inside your web app
✅ RAG systems — AI trained on your own documents and data
✅ LangChain agents for multi-step AI workflows
✅ OpenAI Whisper for voice and transcription features
✅ AI-powered analytics and smart recommendations
✅ Streaming responses for real-time AI UX
✅ 30 days free support after launch
Tech: React · Node.js · OpenAI API · LangChain · Pinecone · PostgreSQL · Supabase · Vercel
AI Algorithms
Large Language Model, Multimodal Large Language Model, Transformer ModelAI Applications
AI Chatbot, AI Content Creation, AI Text-to-Image, AI Text-to-Speech, Anomaly Detection, Automatic Speech Recognition, Conversational AI, Image Upscaling, Natural Language Generation, Natural Language Understanding, Object Detection, Text RecognitionAI Development Language
PythonAI Tools
Azure OpenAI, Gradio, Hugging FaceAI Models
ChatGPT, GPT-3, GPT-4, LLaMA, Stable Diffusion, WhisperWhat's included
| Service Tiers |
Starter
$999
|
Standard
$2,499
|
Advanced
$4,999
|
|---|---|---|---|
| Delivery Time | 7 days | 21 days | 42 days |
Number of Revisions | 1 | 2 | 3 |
AI Model Integration | |||
Batch Normalization | - | - | |
Database Integration | |||
Detailed Code Comments | |||
Image Upscaling | - | - | - |
MLOps | - | - | |
Model Deployment | - | ||
Model Documentation | - | ||
Model Monitoring | - | - | |
Model Testing & Optimization | - | - | |
Model Tuning | - | - | - |
Natural Language Processing | - | ||
NLP Tokenization | - | - | - |
Pre-Training | - | - | - |
Prompt Engineering | |||
Setup File | - | - | - |
Source Code |
Frequently asked questions
About Abhi
SaaS & MVP Full Stack Developer | React, Next.js, Node.js | AI Apps
Surat, India - 5:57 am local time
Send me your idea and I'll send back a scope and quote within 24 hours.
WHAT I BUILD
→ SaaS platforms — multi-tenant architecture, Stripe subscription billing, role-based access, admin panels
→ AI web apps — GPT-4o features inside your product: document analysis (RAG), AI analytics, smart automation
→ Startup MVPs — scoped to v1 essentials, launched fast, built to scale when you grow
→ B2B dashboards — real-time data, reporting, team management, API integrations
RESULTS CLIENTS CARE ABOUT
→ Average MVP delivery: 6 weeks (Next.js 14 + PostgreSQL + Prisma sprint framework)
→ Cut clients' manual work 60–80% with AI automation modules
→ 18+ production web apps across SaaS, AI, and B2B — every one delivered with clean code, GitHub handover, and full documentation
→ 200+ GitHub stars on my open-source SaaS boilerplates and AI tools (linked on this profile — check the code yourself)
TECH STACK
Frontend: React, Next.js 14, TypeScript, Tailwind CSS, shadcn/ui
Backend: Node.js, Express, NestJS, Python, FastAPI
Database: PostgreSQL, MongoDB, Supabase, Prisma
Payments: Stripe (subscriptions, webhooks, billing portal), Paddle
AI: OpenAI API (GPT-4o), RAG, vector embeddings
AI-assisted development: Claude Code, Cursor — I ship faster without shipping sloppy
Cloud: AWS, Vercel, Railway, Cloudflare
HOW I WORK
1. Discovery call — scope your MVP in 30 minutes
2. Architecture plan — stack and database design agreed upfront
3. Sprint development — live demo every Friday, zero surprises
4. QA and launch — I handle deployment and go-live
5. Post-launch — 30 days of free bug fixes
I overlap 4+ hours with US Eastern time every working day.
IF YOU NEED
→ A SaaS MVP launched in 4–8 weeks
→ AI features added to an existing web app
→ A B2B platform with subscriptions and billing
→ A custom dashboard built on your data
Message me your requirements — scope + quote within 24 hours.
Full stack developer for SaaS development, MVP development, AI web app development, Next.js and React web applications.
Steps for completing your project
After purchasing the project, send requirements so Abhi can start the project.
Delivery time starts when Abhi receives requirements from you.
Abhi works on your project following the steps below.
Revisions may occur after the delivery date.
AI Architecture & Prompt Design
I define the AI feature scope, design the prompt engineering strategy, choose the right model and tools (LangChain, RAG, vector DB), and agree on the integration plan.
API Integration & Backend Build
I build the Node.js AI backend — OpenAI API calls, context management, streaming responses, error handling, and rate limiting for production reliability.