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You will get Full Stack Web Developer | MERN | Node JS | React JS | MongoDB

Talwinder S.Status: Offline
Talwinder S. Talwinder S.
5.0
Top Rated
Preview imagePreview image

Let a pro handle the details

Buy Web Application Programming services from Talwinder, priced and ready to go.
Talwinder S.Status: Offline
Talwinder S. Talwinder S.
5.0
Top Rated
Preview imagePreview image

Let a pro handle the details

Buy Web Application Programming services from Talwinder, priced and ready to go.

Project details

⭐ Every project is unique! Let's discuss your requirements in Upwork Chat first, so I can provide a clear timeline and a fixed price or estimated hours. ⭐

Looking for a scalable, high-performance web application? As a Full Stack Developer, I specialize in building modern, responsive, and secure web apps using the MERN Stack (MongoDB, Express.js, React.js, Node.js). Whether you need a custom web app, API development, I’ve got you covered!

My Full Stack Development Services:
✅ Custom Web Applications – Scalable, fast & fully optimized solutions
✅ MERN Stack Development – MongoDB, Express.js, React.js, and Node.js expertise
✅ Frontend Development – Pixel-perfect, responsive UI with React & Next.js
✅ Backend Development – Secure & efficient APIs with Node.js & Express
✅ Database Management – MongoDB design, optimization & data security
✅ Third-Party API Integration – Stripe, PayPal, CRM, and automation tools
✅ Bug Fixes & Performance Optimization – Faster load times & secure apps

I build robust, high-performance web solutions tailored to your business needs. Let’s discuss your project today—send me a message to get started!

NOTE: Mentioned prices are just a PLACEHOLDER !!!
Programming Languages
HTML & CSS, JavaScript, TypeScript
Coding Expertise
Cross Browser & Device Compatibility, Performance Optimization, Design
What's included
Service Tiers Starter
$149
Standard
$799
Advanced
$2,999
Delivery Time 2 days 15 days 30 days
Number of Revisions
01Unlimited
Number of Pages
21020
Design Customization
-
Content Upload
Responsive Design
-
-
Source Code
5.0
174 reviews
98% Complete
(170)
2% Complete
(3)
1% Complete
(1)
1% Complete
(0)
1% Complete
(0)

SS

Sumit S.
5.00
Jul 6, 2026
AI Full Stack Developer | Next.js, Node.js, OpenAI, Automation Workflows I would confidently recommend Talwinder to any client looking for an experienced full-stack developer and would be happy to work with him again on future projects.
Communication was clear and proactive, deadlines were met as mentioned, and he has a solution-oriented mindset.
His technical skills, and reliability made them a valuable part of the project.

AJ

Alice J.
5.00
Jun 29, 2026
Senior Full Stack Developer | React.js, Next.js, Node.js, TypeScript, AWS SaaS Expert If you're looking for a reliable Senior Full Stack Developer with experience in modern JavaScript frameworks, backend development, cloud infrastructure, API integrations, and scalable SaaS applications, I highly recommend working with Talwinder. I would definitely hire him again for future projects.
He demonstrated strong expertise in React.js, Next.js, Node.js, TypeScript, and AWS while delivering a high-quality, scalable SaaS solution. Communication was clear and proactive throughout the project.

DG

Dharinder G.
5.00
Jun 8, 2026
Senior Full Stack Developer | React.js, Next.js, Node.js, TypeScript, AWS, AI Integration Talwinder is outstanding Senior Full Stack Developer an very quickly he delivered the work. Demonstrated strong expertise in React.js, Next.js, Node.js, TypeScript, AWS, and AI integration. Delivered high-quality, scalable, and responsive solutions with excellent communication. Highly recommended for full-stack web development, cloud applications, SaaS platforms, and AI-powered projects.

DG

Dharinder G.
5.00
May 7, 2026
Full Stack AI Developer | LLM, React, Node.js | AI SaaS & Chatbot Development Worked with an excellent Full Stack AI Developer who demonstrated strong expertise in LLM integrations, React, and Node.js development. He delivered high-quality AI SaaS and chatbot features with clean architecture, responsive communication, and attention to detail. The freelancer was proactive in solving technical challenges, met deadlines consistently, and contributed valuable ideas throughout the project. Highly recommended for AI-powered web applications, chatbot systems, and scalable full-stack development.

SS

Sumit S.
5.00
Apr 22, 2026
Full-Stack developer needed for AI-Powered Chatbot with RAG (MERN) Great experience working with this full-stack AI developer. Strong expertise in AI integrations, automation, and backend/frontend development. Delivered a smooth workflow. Communication was clear, and the project was completed efficiently. Highly recommended for AI-powered solutions, API integrations, and scalable web applications.
Talwinder S.Status: Offline

About Talwinder

Talwinder S.Status: Offline
Full-Stack SaaS Developer | AI-Powered MVPs | Claude, AI Agents Expert
100% Job Success
5.0  (174 reviews)
Nangal, India - 4:46 am local time
Most businesses spend weeks searching for a developer who can actually deliver a working AI product not just talk about models and frameworks. I build production-ready AI applications, autonomous agents, and full-stack web apps that solve real business problems, not demos that fall apart after handoff.

With 6+ years in software development and deep specialization in AI engineering, I've built everything from RAG-based knowledge systems and multi-agent automation pipelines to AI SaaS platforms and voice AI agents. If it involves LLMs, Python, or full-stack development — I've built it and shipped it.

WHAT I DELIVER (Services) :
► AI CHATBOTS & CONVERSATIONAL AI
Custom chatbots using OpenAI GPT-4, ChatGPT API, LLaMA 3, and Mistral. Integrated into websites, apps, and messaging platforms with context memory and multi-turn conversations.

► AI AGENT DEVELOPMENT :
Autonomous multi-agent systems with LangChain, CrewAI, AutoGen, and LlamaIndex. Agents that research, process data, make decisions, and execute workflows without constant human oversight.

► RAG PIPELINES & KNOWLEDGE SYSTEMS :
Retrieval-Augmented Generation with vector databases (Pinecone, Weaviate, FAISS, ChromaDB). Enterprise search, document Q&A, and AI knowledge bases with source attribution.

► LLM FINE-TUNING & ALIGNMENT :
Custom model training using LoRA, QLoRA, PEFT. RLHF and DPO alignment for domain-specific accuracy and brand-safe outputs.

► VOICE AI AGENTS :
Speech-to-text and text-to-speech integration. Voice assistants for customer support, operations, and telephony with real-time response handling.

► AI SAAS PRODUCT DEVELOPMENT :
End-to-end product build: system architecture, API design, React/Node frontend, Python backend, deployment. From MVP to scalable production platform.

► CUSTOM GPT & OPENAI INTEGRATION :
GPT-4, GPT-4o, and Assistant API integration into existing platforms. Function calling, structured outputs, and enterprise-grade prompt engineering.

► FULL-STACK WEB APPLICATIONS :
React.js, Node.js, Next.js, MongoDB, REST/GraphQL APIs. Real-time apps, dashboards, marketplaces, and automation platforms.

► PYTHON BACKEND & AUTOMATION :
FastAPI, Flask, Django APIs. Web scraping, data mining, n8n workflows, Telegram bots, trading bots, and Binance API automation.

► AI DEPLOYMENT & INFRASTRUCTURE :
Production deployment on AWS, RunPod, DigitalOcean. Docker containerization, CI/CD pipelines, GPU optimization, and scaling strategy.

PROVEN RESULTS (Why Clients Trust Me) :
✓ $100,000+ earned on Upwork across 233 successful contracts
✓ 100% Job Success Score — every client satisfied, every project delivered
✓ 7,305+ hours of verified development work
✓ Top Rated status — consistently high feedback and on-time delivery
✓ Repeat clients who return for additional AI features and scaling

My clients are startup founders, product teams, and businesses who need AI built properly with clean architecture, real documentation, and zero handholding after delivery. I don't disappear after launch. I make sure it works in production the way it worked in development.

HOW I WORK :
1. REQUIREMENTS — I listen first. Understanding your business goal is more important than the tech stack.
2. ARCHITECTURE — I design the system before writing code. Scalable, documented, and production-ready.
3. BUILD — Weekly updates, transparent progress, demo-ready milestones.
4. DELIVERY — Deployed, tested, monitored, with 30 days post-launch support.


READY TO BUILD?
If you need an AI agent, a RAG system, a chatbot, a full-stack AI app, or a Python automation tool — send me your requirements. I respond within hours with exactly how I'd build it and how long it will take.

Let's turn your AI idea into a working product.

Thanks, — Talwinder | Full-Stack Developer, MERN Stack, RAG, React/Node, AI-Powered SaaS, AI-Powered Healthcare SaaS Platform | SaaS Builder, SaaS Developer, Full-Stack Developer, MERN Stack, Next.js Developer, React.js Developer, Node.js Developer, AI Model Integration, AI Developer, OpenAI, GPT, Chatbot Integration, Task Automation, API Integration, Stripe Integration, Payment Gateway, MongoDB, PostgreSQL, Tailwind CSS, Shadcn/UI, MVP Developer, Startup, Web Application Developer | Full Stack Developer, SaaS Developer, Marketplace Developer, Custom Web Application Developer, Startup MVP Developer, Product Engineer, Platform Developer, CRM Developer, Dashboard Developer, Workflow Automation, Business Systems, API Development, Multi-Tenant SaaS, Scalable Web Applications

Steps for completing your project

After purchasing the project, send requirements so Talwinder can start the project.

Delivery time starts when Talwinder receives requirements from you.

Talwinder works on your project following the steps below.

Revisions may occur after the delivery date.

Requirements Gathering

Before starting any development work, I will take the time to understand your requirements in detail.

Development

With your approval of scope, I will begin the development process. This will include Full Stack new development MERN updates / customization & fixes

Review the work, release payment, and leave feedback to Talwinder.