Full Stack & GenAI Developer

I build production-grade AI applications and full-stack platforms using OpenAI (GPT-4o, Realtime API, Assistants, Vector Store) and xAI Grok — from AI voice assistants to multi-tenant EdTech platforms.

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Full Stack

End-to-end development

GenAI Apps

OpenAI · xAI Grok

Modern Web

Latest technologies

15+

Completed Projects

Ongoing Projects

15+

Happy Clients

Years Experience

Ready to Build Something Amazing?

Let's discuss your project and turn your vision into reality with cutting-edge technology.

Available for new projects

Response time: Usually within 24 hours

What I Can Do For You

From simple websites to complex AI-powered applications, I provide comprehensive development services to bring your ideas to life.

Full Stack Web Development

Complete web applications using React, Next.js, Node.js, and modern databases.

Responsive Design
SEO Optimized
Fast Performance
Scalable Architecture

GenAI Application Development

Production-grade AI apps using OpenAI (GPT-4o, Assistants API, Vector Store) and xAI Grok with structured outputs, RAG pipelines, and multi-LLM support.

Multi-LLM Integration (OpenAI, Grok)
Function Calling & Tool Use
Structured JSON Outputs
RAG with Vector Store

AI Voice & Realtime Systems

Live speech-to-speech AI assistants using OpenAI Realtime API and WebRTC for natural, low-latency voice interactions.

OpenAI Realtime API
Speech-to-Speech (WebRTC)
Live AI Interview Systems
Real-time Feedback

E-commerce Solutions

Complete online stores with payment integration, inventory management, and admin panels.

Payment Gateway
Inventory System
Order Management
Analytics Dashboard

Backend API Development

Robust REST APIs and GraphQL endpoints with authentication and data validation.

RESTful APIs
Authentication
Data Validation
Documentation

Custom Web Applications

Tailored web solutions for specific business needs and requirements.

Custom Features
Third-party Integration
Cloud Deployment
Maintenance

Technical Expertise

Proficient in modern web technologies and GenAI integration — building production AI apps with OpenAI and xAI Grok.

Frontend Technologies

HTML595%

CSS390%

JavaScript95%

React.js90%

Next.js85%

Backend Technologies

Node.js90%

Express.js85%

MongoDB80%

MySQL85%

REST APIs90%

GenAI & AI Integration

OpenAI API (GPT-4o, Assistants, Vector Store)90%

xAI Grok78%

Function Calling & Structured Outputs85%

Prompt Engineering88%

Realtime / Voice AI (WebRTC)82%

Integrations & Services

Nodemailer / SMTP (Gmail, Azure)90%

PayU Payment Gateway85%

Razorpay78%

Twilio72%

NextAuth.js / OAuth85%

Featured Projects

Here are some of my recent projects showcasing different technologies and solutions.

PrepAI – AI Learning & Career Platform

Production-grade EdTech platform with AI chat, quizzes, personalized lessons, live mock interviews, resume builder with ATS scoring, and organization-level candidate management.

Next.js 14MongoDBOpenAI APISocket.ioNextAuth.jsPayU

Live Demo

ColdSend AI – Personalized Cold Email Platform

An AI-powered platform that generates and sends highly personalized cold emails at scale using resumes and job descriptions.

Next.js (App Router)Node.jsOpenAI Responses APIMongoDB + GridFSNodemailerTailwind CSSshadcn/ui

Live Demo Code

Screenshot coming soon

Sagar – Brand Studio Portfolio (Freelance)

Animated portfolio for a branding and design studio with fluid GSAP animations, 3D WebGL light ray effects, and interactive bento grid. Built for a freelance client.

Next.js 16React 19GSAP 3Three.jsReact Three FiberTailwind CSS v4

Live Demo Code

Screenshot coming soon

FixCvNow – AI Resume Optimizer (Freelance)

A no-login resume SaaS where users upload a CV, choose a professional template, and pay to download or AI-optimize it. Built for a freelance client.

Next.js 14OpenAI GPT-4oTailwind CSSshadcn/uiZod

Meera Clinic – AI Appointment Assistant

AI-powered web app for booking, rescheduling, and managing clinic appointments with chat and speech-to-speech support.

Next.jsNode.jsOpenAI APIMongoDBTailwind CSS

Live Demo Code

Screenshot coming soon

Haldia Guest House – Booking System

Full-stack guest house booking and management system with role-based access, OTP email authentication, and complete booking lifecycle — built during work.

Next.js 15MongoDBJWTNodemailershadcn/ui

AI Career Coach

An AI-powered career assistant that gives real-time resume feedback and role recommendations.

Next.jsOpenAI APITailwind CSS

Live Demo

Mock Interview AI

Live speech-to-speech mock interview tool simulating real recruiter questions and feedback.

ReactSocket.ioOpenAIRealtime API

Live Demo

iPhone 15 Website Clone

A high-fidelity iPhone 15 landing page clone with scroll animations and interactive 3D model using GSAP and Three.js.

ReactThree.jsGSAPTailwindCSS

Live Demo Code

View All Projects

What Clients Say

Don't just take my word for it. Here's what my clients have to say about working with me.

"I run a clothing business in Kolkata and needed a proper online store. Raj built the full website with a smooth payment setup and an AI bot that handles customer queries automatically. Since the launch, our sales have improved and I don't have to spend all day answering basic questions. Very happy with the results!"

Debraj Chakraborty

Business Owner, Kolkata

"He managed the complete backend for my astrology app. From real-time notifications to automated alerts using cron jobs, everything works perfectly. The best part is the system never lags, even with many users. I've already started discussing the Version 2.0 update with him because his work is top-notch."

Suman Das

Client from Kolkata

"As a tax professional, I handle a lot of private financial papers. I needed a tool to split and compress large PDFs without uploading them to any random website. The tool Raj built works entirely on my computer, so my data stays safe. It's fast, simple, and has made my daily paperwork much easier."

Ashish Mohan

Tax Consultant

Ready to Start Your Next Project?

Let's discuss your ideas and create something amazing together. I'm here to help bring your vision to life with cutting-edge technology.

Get Started Today View Portfolio