You will get Full Stack Developer | Legacy Code Refactor | React + Node.js Modernization
Project details
Breathe new life into legacy applications with a Full Stack Developer experienced in modernization projects. Over time, older codebases accumulate technical debt, slowing feature development and increasing maintenance costs. I transform these systems into modern, maintainable applications using React, Node.js, and TypeScript.My modernization approach is risk-averse-I migrate incrementally, running old and new systems in parallel before switching traffic. This eliminates downtime and prevents data loss. I upgrade databases, refactor business logic, improve security, and add testing frameworks that protect against future regressions.The result? Faster feature releases, easier hiring (developers prefer modern tech), reduced hosting costs, and improved performance. Legacy applications often run 10x slower than necessary-migration unlocks that efficiency.
Programming Languages
HTML & CSS, JavaScript, TypeScriptCoding Expertise
Cross Browser & Device Compatibility, Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$500
|
Standard
$1,500
|
Advanced
$2,500
|
|---|---|---|---|
| Delivery Time | 10 days | 16 days | 23 days |
Number of Revisions | 0 | 0 | 0 |
Design Customization | - | - | - |
Content Upload | - | - | - |
Responsive Design | - | - | - |
Source Code | - | - | - |
About Nasir Uddin
Full Stack Developer | SaaS MVP & AI Agents (Next.js, React, Node.js)
Gilgit, Pakistan - 1:29 pm local time
Specializing in AI Agents, LLM-powered applications, and automation systems, I integrate OpenAI, ChatGPT, and Claude APIs to build intelligent features like chatbots, workflow automation, content generation tools, and AI assistants that improve productivity and scale businesses.
With strong expertise in full-stack development, I build complete solutions from frontend to backend, including architecture design, APIs, databases, authentication, and cloud deployment. Every application is designed to be secure, scalable, and performance-optimized.
Core Expertise:
• SaaS MVP Development (from idea to launch)
• AI Agents & LLM Applications
• OpenAI / ChatGPT / Claude API Integration
• Full Stack Web Development
• Next.js & React.js Frontend Development
• Node.js & Express.js Backend Development
• REST APIs & System Architecture
• Database Design (PostgreSQL, MySQL, MongoDB)
• Authentication & User Management Systems
• Stripe & Payment Integration
• Dashboard & Admin Panel Development
• Cloud Deployment (Vercel, AWS)
• Performance Optimization & Technical SEO
Tech Stack:
Next.js, React, Node.js, TypeScript, JavaScript, Express.js, PostgreSQL, MySQL, MongoDB, Prisma, Tailwind CSS, REST APIs, OpenAI, Claude AI, Stripe, AWS, Vercel, GitHub.
I focus on building real-world, scalable SaaS products and AI systems that help businesses automate processes, reduce manual work, and launch faster with clean, maintainable code.
Steps for completing your project
After purchasing the project, send requirements so Nasir Uddin can start the project.
Delivery time starts when Nasir Uddin receives requirements from you.
Nasir Uddin works on your project following the steps below.
Revisions may occur after the delivery date.
Application Audit
Analyze the existing codebase, architecture, dependencies, and technical debt.
Modernization Roadmap
Create a phased migration strategy with timelines, risks, and priorities.