You will get Full Stack Developer | MERN Stack | React js | Node JS | Next.js | AI
Project details
Are you searching for a professional Full Stack Developer with expertise in Node.js, MongoDB, and the MERN stack? I’m a dedicated freelance developer experienced in creating modern, scalable web applications and SaaS solutions.
I provide custom development services, carefully built to match your business goals and project requirements.
My MERN Stack Services Include:
Full-stack web application development with MERN stack
Custom website and web app development from scratch
Figma, Adobe XD, or PSD to responsive front-end conversion
REST API development and third-party API integration
Code optimization, debugging, and performance improvements
Responsive, mobile-friendly, and cross-browser compatible designs
Bug fixing, updates, and long-term maintenance support
Full Stack Developer, MERN Stack Developer, React.js, Node.js, Next.js, Express.js, Laravel, PHP, MongoDB, SQL, SaaS Development, API Integration, Web Application Development, AWS, Docker, CI/CD, Authentication Systems, Secure Web Development, Cloud Deployment, UI/UX Design, Website Design, Landing Page Development, Responsive Website Development, Custom Software Solutions.
I provide custom development services, carefully built to match your business goals and project requirements.
My MERN Stack Services Include:
Full-stack web application development with MERN stack
Custom website and web app development from scratch
Figma, Adobe XD, or PSD to responsive front-end conversion
REST API development and third-party API integration
Code optimization, debugging, and performance improvements
Responsive, mobile-friendly, and cross-browser compatible designs
Bug fixing, updates, and long-term maintenance support
Full Stack Developer, MERN Stack Developer, React.js, Node.js, Next.js, Express.js, Laravel, PHP, MongoDB, SQL, SaaS Development, API Integration, Web Application Development, AWS, Docker, CI/CD, Authentication Systems, Secure Web Development, Cloud Deployment, UI/UX Design, Website Design, Landing Page Development, Responsive Website Development, Custom Software Solutions.
Programming Languages
HTML & CSS, JavaScript, TypeScriptCoding Expertise
Cross Browser & Device Compatibility, PSD to HTML, Performance OptimizationWhat's included
| Service Tiers |
Starter
$110
|
Standard
$499
|
Advanced
$1,200
|
|---|---|---|---|
| Delivery Time | 3 days | 7 days | 14 days |
Number of Revisions | 3 | 3 | Unlimited |
Number of Pages | 3 | 7 | 12 |
Design Customization | |||
Content Upload | - | ||
Responsive Design | |||
Source Code |
7 reviews
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TP
Theodosis P.
Jul 29, 2026
AI Screen Recording Expert Needed for a Large YouTube Project ($1,000 Fixed Price)
Great work!!
MS
Muhammad S.
Apr 25, 2024
I want a HTML, CSS, JS, NODEJS, MYSQL developer.
He worked perfectly and covered all the requirements with good pace. Highly recommended!
UM
Uswege M.
Jun 29, 2023
Full stack web developer
it was such a nice experience to work with Hassaan, the communication and speed of delivery was superb. i will definitely work with him again.
KP
Kim P.
Jun 12, 2023
Appraisal Order and Tracking System
Hassaan was amazing to work with on our program. This was a challenging request that required a lot of very detailed requirements. Hassaan was very patients and worked with me and my team every step of the way to be sure this project was 100% what we needed. He exceed all our our expectations. And the support after the site went live being available to fix and change things immediately was so helpful to ensure our business continued to run smoothly. I would recommend Haasan for any project especially if you need a detail oriented person with great communication and follow up.
UM
Uswege M.
May 30, 2023
Full stack web developer
About Hassaan
AI & SaaS Developer | React, Next.js, Node.js | LLM & OpenAI Integrate
Karachi, Pakistan - 10:41 pm local time
I build AI-powered SaaS products that actually ship — from LLM integrations and AI agents to full-scale SaaS platforms used by thousands of users.
Over 7+ years, I've helped founders and startups go from idea to production: integrating OpenAI, building AI workflows, automating business processes, and architecting SaaS platforms that scale.
If you need an AI chatbot, LLM-powered product, SaaS application, or custom automation — I can take it from zero to live.
🌟 𝗪𝗵𝗮𝘁 𝗜 𝗛𝗮𝘃𝗲 𝗗𝗲𝗹𝗶𝘃𝗲𝗿𝗲𝗱 𝗳𝗼𝗿 𝗖𝗹𝗶𝗲𝗻𝘁𝘀
𝐌𝐞𝐝𝐢𝐜𝐮𝐬.𝐚𝐢 — AI health platform across 18 markets; integrated LLM-powered patient reporting
𝐌𝐚𝐜𝐡𝟑𝟑 (𝟑𝟑𝐟𝐠.𝐜𝐨𝐦) — Space investment research SaaS; gated dashboard used by BlackRock and SpaceX analysts
𝐅𝐥𝐞𝐱𝐂𝐚𝐭𝐞𝐫𝐢𝐧𝐠𝐇𝐐 — Enterprise catering SaaS; cut order processing time by 40%
𝐂𝐚𝐭𝐜𝐡.𝐜𝐨 — Insurance platform for US freelancers; improved load performance by 35%
𝐑𝐞𝐯𝐞𝐚𝐥𝐢𝐱 — Techstars healthtech startup; scaled from beta to commercial production on AWS
𝐆𝐚𝐥𝐢𝐥𝐞𝐨 𝐏𝐫𝐨𝐭𝐨𝐜𝐨𝐥 — Blockchain tokenization platform; built pNFT marketplace and smart contract flows
Every project starts with your goal. It ends with a product your users actually want to use.
𝗖𝗼𝗿𝗲 𝗘𝘅𝗽𝗲𝗿𝘁𝗶𝘀𝗲
AI Application Development & LLM Integration (OpenAI, GPT-4, Assistants API, RAG)
AI Agent & Workflow Automation
SaaS Application Development
Full Stack Development — React.js, Next.js, Node.js, Express.js
Database Design — MongoDB, PostgreSQL, Prisma
REST APIs & GraphQL
Stripe Payments & Subscription Systems
Authentication & Role-Based Access Control
Cloud Infrastructure — AWS, Vercel, Docker, CI/CD
𝗪𝗵𝗮𝘁 𝗠𝗮𝗸𝗲𝘀 𝗠𝘆 𝗪𝗼𝗿𝗸 𝗗𝗶𝗳𝗳𝗲𝗿𝗲𝗻𝘁
Most developers hand over a working app and disappear. I think about what happens after it goes live — does it handle traffic spikes? Is the codebase clean enough for your team to build on? Can you add features without rewriting everything?
You are not just getting a developer. You are getting someone who thinks about architecture, performance, and product experience together.
𝗖𝗹𝗶𝗲𝗻𝘁𝘀 𝗧𝘆𝗽𝗶𝗰𝗮𝗹𝗹𝘆 𝗖𝗼𝗺𝗲 𝘁𝗼 𝗠𝗲 𝗙𝗼𝗿:
AI developer to integrate OpenAI, GPT-4, or custom LLM into their product
AI agent and automation workflows for real business use cases
SaaS platform built for scalability, security, and long-term growth
Full stack developer who owns both frontend and backend
React.js / Next.js developer for fast, modern web applications
Node.js developer for APIs, backend systems, and third-party integrations
MVP development — idea to production, fast and clean
🌟 𝗧𝗲𝗰𝗵 𝗦𝘁𝗮𝗰𝗸
React.js, Next.js, Node.js, Express.js, MongoDB, PostgreSQL, Prisma, OpenAI API, LangChain, Clerk, TailwindCSS, Stripe, Docker, Vercel, AWS
𝗪𝗵𝘆 𝗖𝗹𝗶𝗲𝗻𝘁𝘀 𝗪𝗼𝗿𝗸 𝗪𝗶𝘁𝗵 𝗠𝗲
Daily updates — you always know what's done, what's next, and how long it takes
I flag problems early, not after they cost you time and money
Clean, documented code your team can build on without calling me back
I think like a product builder, not just a coder
🟢 𝗔𝘃𝗮𝗶𝗹𝗮𝗯𝗹𝗲 𝗳𝗼𝗿 𝗻𝗲𝘄 𝗽𝗿𝗼𝗷𝗲𝗰𝘁𝘀
I work best with founders, startups, and growing companies that value clean architecture, long-term scalability, and thoughtful product development.
If that sounds like your project, let's talk.
𝗞𝗲𝘆𝘄𝗼𝗿𝗱𝘀: AI Developer, LLM Integration, OpenAI Developer, SaaS Developer, Full Stack Developer, React.js, Next.js, Node.js, AI Agent, Workflow Automation, MVP Development, Web Application Development, PostgreSQL, MongoDB
Steps for completing your project
After purchasing the project, send requirements so Hassaan can start the project.
Delivery time starts when Hassaan receives requirements from you.
Hassaan works on your project following the steps below.
Revisions may occur after the delivery date.
📝 Requirement Review & Clarification
Review client-provided documents and materials Clarify doubts (if any) via messages or call
Work start
Create a modern, SEO-friendly website. Share for client feedback & revisions Final approval before submmision