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

Mithun P.Status: Offline
Mithun P. Mithun P.
5.0
Preview imagePreview imagePreview imagePreview image

Let a pro handle the details

Buy Web Application Programming services from Mithun, priced and ready to go.
Mithun P.Status: Offline
Mithun P. Mithun P.
5.0
Preview imagePreview imagePreview imagePreview image

Let a pro handle the details

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

Project details

👋 Hi there! 🌟Are you looking for a Full Stack Developer who has extensive hands-on experience in both Front End Development & Back End Development ? Congrats! You are at the right place.

⭐ IMPORTANT: Every Client has custom requirements - let's talk in Upwork Chat before ordering

All Full Stack Development / Customization / Updates / Fixes will be done at $15/hr. Can give fixed price also after communication in Upwork messages. ⭐

After discussing your complete project requirements in the Upwork chat - Will share you fix price & timeline for project completion. Let's start talk with the Section below.

🚀My Services includes:

➥ MEAN stack-based development, including full-stack website development
➥ Website development and web application development using MERN, React.js, Node.js, and MongoDB, Next.js, Laravel
➥ Conversion of PSD/Xd/Figma designs into responsive websites using React.js, Next.js, Redux, and Node.js
➥ APIs development and integration to enhance website functionality
➥ Code debugging and optimization for fast loading and improved performance
➥ Ensuring mobile responsiveness and cross-browser compatibility for seamless user experience
➥ Fixing bugs and issues.
Programming Languages
JavaScript, TypeScript
Coding Expertise
Cross Browser & Device Compatibility, Performance Optimization, Design
What's included
Service Tiers Starter
$50
Standard
$250
Advanced
$1,500
Delivery Time 1 day 7 days 30 days
Number of Revisions
25Unlimited
Number of Pages
1415
Design Customization
-
Content Upload
-
-
Responsive Design
Source Code
Optional add-ons You can add these on the next page.
Fast Delivery
+$50 - $150
Additional Page (+ 1 Day)
+$30
Design Customization (+ 1 Day)
+$30

Frequently asked questions

5.0
7 reviews
100% Complete
(7)
1% Complete
(0)
1% Complete
(0)
1% Complete
(0)
1% Complete
(0)

MK

Mr M B K.
5.00
Aug 22, 2026
Fix AI Agent Message Response Issue - Nodejs, Nextjs & OpenAI Really impressed with the work. The issue was identified quickly, and the fix was handled with a thoughtful approach. Communication was easy throughout the project, and everything was completed on time with great attention to detail. The final result exceeded expectations, and I’d gladly work together again.

MK

Mr M B K.
5.00
Aug 18, 2026
AI SaaS project bug fixing I had a great experience working with Mithun. He understood the project requirements quickly and handled the AI SaaS development and bug fixes with a strong understanding of both frontend and backend development. He was easy to communicate with, paid attention to the details, and made sure everything was working properly before wrapping things up. I really appreciated his approach to solving problems and keeping the project moving forward. I’d be happy to work with him again on future projects.

MK

Mr M B K.
5.00
Aug 12, 2026
Full Stack Mern Developer - React/Nextjs, Nodejs, ExpressJs, MongoDb/PostgreSQL Great experience working with Mithun on our AI hiring SaaS platform. He handled full-stack development, automated interviews, AI-powered candidate screening and evaluation, dashboards, and workflow automation. His React/Next.js, Node.js, and AI integration skills were excellent. Reliable, responsive, and highly recommended for AI SaaS development.

JO

Joel O.
5.00
Jul 16, 2025
Full Stack Dev - React/NextJS

DL

Diane L.
5.00
Jul 12, 2025
Full Stack Event Management WebApp Development Job has been done as required and on time. so thank you. we are cheking to see for the next one
Mithun P.Status: Offline

About Mithun

Mithun P.Status: Offline
AI Agent Developer | LLM, RAG, LangChain & Python
100% Job Success
5.0  (7 reviews)
Dhaka, Bangladesh - 9:53 pm local time
Hi This is Mithun, I'm an AI Engineer and AI Agent Developer specializing in AI agents, LLM applications, RAG systems, LangChain, Python, and AI-powered SaaS products. I build production-ready AI solutions that automate workflows and solve real business problems.

I help startups, SaaS companies, and growing businesses design and build intelligent AI systems from AI agents and RAG applications to AI chatbots, workflow automation, and full-stack AI products.

I create and implement AI agents, AI integration, chatbots, automation systems, AI SaaS solutions, custom web applications, AI-powered MVPs, AI healthcare solutions, AI writing tools, GPT clone, full stack application, multi-tenant and unique AI solutions in production.

Before writing a single line of code, I design a full-fledged AI strategy for your company, so you will have a clear understanding of what to build, how much it will cost, and what to exclude. Most mistakes related to AI budgets are related to development of the wrong things first.

Primary Expertise:
* AI Agent Development
* AI Automation
* LLM Application Development
* RAG Systems
* AI Chatbot Development
* Generative AI
* Multi-Agent Systems
* AI SaaS Development
* OpenAI API Integration
* LangChain Development
* Python AI Development
* Full-Stack AI Applications

Supporting Expertise:
* React.js
* Next.js
* TypeScript
* Node.js
* Express.js
* REST APIs
* WebSockets
* SaaS Architecture
* Multi-Tenant Applications

Technical Stack:
AI & LLM Development:
Python | AI Agents | LLMs | Generative AI | OpenAI API | LangChain | LlamaIndex | RAG | Multi-Agent Systems | Prompt Engineering | NLP | AI Chatbots

Backend Development:
Python | Node.js | Express.js | REST APIs | GraphQL | WebSockets | JWT Authentication | API Integration

Frontend Development:
React.js | Next.js | TypeScript | Tailwind CSS | Redux | Context API

SaaS & Application Development:
AI SaaS | Multi-Tenant SaaS | SaaS Architecture | RBAC | Subscription Systems | Billing Integration | Admin Dashboards

WHAT I'VE SHIPPED IN PRODUCTION:

1. AI Interview: AI Hiring Assistant SaaS Platform with Automated Interviews & Smart Candidate Screening
* AI-powered automated interviews 24/7
* Reduces hiring time by almost half
* SaaS dashboard
* Features: Interview recording, playback, bias-free screening, parallel processing
AI Hiring Platform | AI SaaS | Automated Interviews | Candidate Screening | AI Evaluation | Recruitment Automation

2. Multi-Agent Autonomous SEO Publishing Engine
* 6 Synchronized AI Agents working autonomously
* Automated daily SEO publishing
* Fact-checking AI built-in
* 23 schema types, 30+ language support
AI Agents | Multi-Agent Systems | AI Automation | Autonomous Agents | Generative AI

3. Chat SEO: SaaS SEO Chat Platform with Google Search Console Intelligence System
* AI-powered SEO chat interface
* Replaced 5 SEO subscriptions with one tool
* Full SaaS with billing, team management, affiliate tracking
* Live GSC integration, competitor analysis, crawl error detection
Generative AI | SEO Automation | AI Agents | Google Search Console | SaaS

4. Appointment AI Automation Platform with Social DM Lead Qualification
* AI lead qualification from Instagram DMs
* Converted DMs into sales calls
* Full SaaS platform (plans, billing, affiliate tracking)
* Multi-channel routing, ROI calculator
RAG | AI Chatbot | Knowledge Base | LangChain | LLM | OpenAI API

Send me your requirements, existing architecture, or product idea. I'll outline the recommended architecture, AI approach, and development roadmap before we start.

Steps for completing your project

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

Delivery time starts when Mithun receives requirements from you.

Mithun works on your project following the steps below.

Revisions may occur after the delivery date.

Gather Requirements & Analysis the Requirements

Start doing R&D and ERD for Database

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