You will get custom web app using Next.js (MERN)
Top Rated
Top Rated
Project details
The "Web Application Developed & Launched" project is a comprehensive undertaking that spans the entire lifecycle of web application development. From meticulous planning and requirements gathering to strategic design, coding, and successful deployment, this project focuses on delivering a high-quality, user-centric web application. By incorporating market research, cutting-edge technology, and a robust testing process, the goal is to not only meet but exceed client expectations.
Programming Languages
HTML & CSS, JavaScript, TypeScriptCoding Expertise
Cross Browser & Device Compatibility, Security, DesignWhat's included
| Service Tiers |
Starter
$2,000
|
Standard
$5,000
|
Advanced
$8,000
|
|---|---|---|---|
| Delivery Time | 5 days | 10 days | 15 days |
Number of Revisions | 3 | 4 | 5 |
Design Customization | - | ||
Content Upload | |||
Responsive Design | |||
Source Code | - | - |
22 reviews
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MO
Michael O.
Feb 9, 2026
Expert MERN Developer Needed for Data Visualization Project
Hassaan did an outstanding job and exceeded our expectations in every way. He quickly became a lead developer on the project, taking ownership of complex requirements and delivering high-quality, well-structured work consistently. His technical expertise, problem-solving skills, and attention to detail were exceptional, especially across the full MERN stack and data visualization components.
Communication was clear, proactive, and reliable throughout the engagement. He was thoughtful in his approach, offered smart suggestions, and executed efficiently without sacrificing quality. Hassaan is someone you can truly trust with critical work and tight timelines.
We would absolutely work with him again and highly recommend him to any team looking for a dependable, highly skilled, and impactful developer.
Communication was clear, proactive, and reliable throughout the engagement. He was thoughtful in his approach, offered smart suggestions, and executed efficiently without sacrificing quality. Hassaan is someone you can truly trust with critical work and tight timelines.
We would absolutely work with him again and highly recommend him to any team looking for a dependable, highly skilled, and impactful developer.
KW
Kevin W.
Nov 17, 2025
Avatars LLM & Live Streaming Connectors
Hassan was very responsive, professional, and communicative. Will be working with him & his colleagues again soon!
CE
Cam E.
Sep 26, 2025
AI Agent & Automation Developer Needed
BD
Bsd D.
Sep 11, 2025
"Leveraging AI for Automated Amazon Product Analysis and Optimization"
UK
Ulrika K.
Jul 22, 2025
Website Launch Assistance on Replit AI
Excellent work - very professional team with great development skills. Highly recommend.
About Hassaan
Full Stack Developer & AI Engineer | SaaS MVPs, AWS, AI Agents, LLM
100%
Job Success
Islamabad, Pakistan - 10:48 pm local time
If you shoot me a invitation or direct message i'll send you a personalized loom video back on how i may be able to hep you!
Your AI SaaS works in the demo, then breaks the moment real users hit it. I build the version that doesn't, the kind running production right now, moving 10,000+ messages a day at 99% delivery and saving one client $200k+ a year. RAG that doesn't hallucinate, agents that survive edge cases, multi-tenant data that stays sealed. And where it matters most, in regulated healthcare and fintech, that's the work I'm known for.
Over the last 10+ years, I've worked across FinTech, Health Tech, HR Tech and Ed Tech, designing and delivering full stack platforms, AI Powered products, workflow automation systems, cloud native applications. As a Top Rated Plus on Upwork with 1000+ billed hours and a consistent 5 star track record, I focus on building systems that remain reliable as your user base grows.
WHAT MAKES ME DIFFERENT:
Most developers focus on delivering features.
I focus on delivering systems that can operate in production.
Before writing code, I help founders and product teams make the right architecture decisions around scalability, AI integration, data modeling, compliance requirements, infrastructure codes and long term maintainability.
Whether you're launching MVP modernizing a legacy platform, integration AI into existing product or building a SaaS platform from scratch. I help define the technical roadmap and then execute it end-to-end.
My work frequently involves:
• AI native SaaS products and multi- tenant platforms
• AI agents, AI voice agents and intelligence automation
• Retrieval-Augmented Generation (RAG) systems ad knowledge assistants
• HIPAA compliant healthcare applications
• Secure Fintech and payment platforms
• Enterprise API integrations and workflow automation
• Cloud native infrastructure and DevOps
What Client Says:
"This developer did an outstanding job and exceeded our expectations in every way. They quickly became a lead developer, taking ownership of complex requirements and delivering high-quality, well-structured work consistently."
"Very responsive, professional, and communicative. Will be working with them again soon!"
WHAT I BUILD FOR YOU:
→ AI-powered SaaS platforms, startup MVPs, and multi-tenant SaaS applications with Stripe billing, RBAC, ABAC, audit logs, and row-level security
→ AI Agents, AI Voice Agents, RAG systems, knowledge assistants, and business automation powered by OpenAI, Claude, Gemini, LangChain, LangGraph, and custom LLM workflows
→ Full-Stack Web Applications using Next.js, React, TypeScript, Node.js, Python, FastAPI, and modern cloud-native architectures
→ HealthTech solutions including HIPAA-compliant platforms, patient engagement systems, healthcare workflows, and secure data management
→ FinTech applications including payment systems, subscription platforms, financial dashboards, transaction processing, and compliance-focused architectures
→ API Development and Integrations with OpenAI, Stripe, Twilio, HubSpot, Salesforce, CRMs, ERPs, and third-party SaaS platforms
→ Workflow Automation using n8n, AI-powered business processes, customer support automation, onboarding automation, and sales automation
→ Cloud Infrastructure, AWS deployments, Docker, CI/CD pipelines, monitoring, production rollouts, and scalable backend systems
CORE STACK & KEYWORDS:
Next.js, React, TypeScript, Node.js, Nest.js, Python, FastAPI, Django • Open AI, GPT-4, Claude, Gemini, LangChain, LangGraph, AI Agents, AI Voice Agents, RAG, Vector Database, pgvector, Pinegone • PostgreSQL, Supabase, MongoDB, Redis, Firebase • AWS, Docker, Kubernetes, CI/CD • Stripe, Twilio, HubSpot, Salesforce, • Multi-tenant SaaS, MVP Development, SaaS Architecture, Workflow Automation, HIPAA, SOC2, PCI-DSS, OAuth2, RBAC, ABAC, Row Level Security, Full-Stack Development
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.
Project Planning
1. Define the goals and objectives of the web application. 2. Outline the scope, target audience, and key features.
Requirements Gathering
1. Collaborate with stakeholders to collect detailed project requirements. 2. Document both functional and non-functional specifications.