You will get saas ai llm web app development with nextjs, fastapi, nodejs, langchain
Project details
I'm a SaaS AI LLM web application developer specializing in building scalable, production-ready AI products using Next.js, FastAPI, Node.js, LangChain, OpenAI, and vector database systems like Pinecone.
I focus on designing and developing intelligent SaaS platforms that are fast, reliable, and built for real-world usage at scale.
What I deliver:
• Frontend Development with Next.js, building modern, responsive, AI-powered user interfaces
• Backend Development with FastAPI and Node.js, delivering high-performance, scalable APIs and services
• AI Integration using LangChain and OpenAI, enabling advanced LLM-driven features and workflows
• Vector Database Integration for semantic search, embeddings, and knowledge-based AI systems
Why work with me:
• Strong expertise in modern AI and LLM stack engineering
• Clean, scalable architecture focused on long-term maintainability
• Commitment to quality execution and reliable delivery timelines
• Business-focused approach, translating ideas into working AI products
My goal is to help you launch impactful SaaS AI solutions that stand out in competitive markets. Let’s collaborate to turn your vision into a high-performance AI product.
I focus on designing and developing intelligent SaaS platforms that are fast, reliable, and built for real-world usage at scale.
What I deliver:
• Frontend Development with Next.js, building modern, responsive, AI-powered user interfaces
• Backend Development with FastAPI and Node.js, delivering high-performance, scalable APIs and services
• AI Integration using LangChain and OpenAI, enabling advanced LLM-driven features and workflows
• Vector Database Integration for semantic search, embeddings, and knowledge-based AI systems
Why work with me:
• Strong expertise in modern AI and LLM stack engineering
• Clean, scalable architecture focused on long-term maintainability
• Commitment to quality execution and reliable delivery timelines
• Business-focused approach, translating ideas into working AI products
My goal is to help you launch impactful SaaS AI solutions that stand out in competitive markets. Let’s collaborate to turn your vision into a high-performance AI product.
Programming Languages
JavaScript, Python, TypeScriptCoding Expertise
Cross Browser & Device Compatibility, Performance Optimization, SecurityWhat's included
| Service Tiers |
Starter
$1,000
|
Standard
$2,000
|
Advanced
$3,000
|
|---|---|---|---|
| Delivery Time | 10 days | 15 days | 17 days |
Number of Revisions | 1 | 2 | 3 |
Design Customization | - | ||
Content Upload | - | ||
Responsive Design | |||
Source Code | - |
Optional add-ons
You can add these on the next page.
Fast Delivery
+$500 - $1,500
Additional Revision
+$400About Ahmad Hassan
Full Stack Developer | MERN Stack | NextJS, Node.js | SaaS & AI Apps
Islamabad, Pakistan - 3:32 am local time
Not someone who requires three check-ins to understand your requirements,
or disappears after the first milestone.
I review your architecture, spot issues before they hit production,
and deliver code your next developer will thank you for, not curse.
Experience: 3.5+ years building production-grade web applications,
SaaS platforms, AI-powered tools, real-time systems, payment infrastructures,
and complex API ecosystems.
Current Role: Founding Full Stack Developer for an AI SaaS platform,
actively working on Upwork with a consistent track record of delivering
on time and on budget.
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WHAT I BUILD
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I cover the complete product lifecycle, from database schema
and backend API to React frontend and cloud deployment.
Whether you need:
- Full stack web developer to build your MVP from scratch
- React developer to rebuild a broken frontend
- Node.js backend developer to untangle a spaghetti API
…I’ve done it all.
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TECHNICAL EXPERTISE
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Frontend:
React.js, Next.js, TypeScript, TailwindCSS, Redux, Material UI
Backend:
Node.js, Express.js, NestJS, REST APIs, GraphQL
Databases:
MongoDB, PostgreSQL, MySQL – schema design, indexing, optimization
Cloud & DevOps:
AWS (EC2, S3, Lambda), Docker, CI/CD pipelines, Vercel
Payments & Authentication:
Stripe, PayPal, JWT, OAuth 2.0 (Google, GitHub, LinkedIn, Facebook)
AI & Integrations:
OpenAI API, LLM integrations, vector embeddings, multi-agent architectures
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PROVEN RESULTS
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Algorithmic Trading Platform:
Built a real-time dashboard serving 1,000+ active users
with WebSocket-powered market data and automated strategies
→ 300% increase in user engagement
AI-Powered Developer Tool:
Frontend development for a code editor extension
integrating LLM models for automated code generation, review, and debugging
Enterprise Payment Infrastructure:
Delivered billing systems with 99.9% transaction success rate,
automated webhook handling, subscription management,
and failed payment recovery flows
Multi-Platform SaaS:
Developed a social media automation platform with integrations
across 5+ networks, content scheduling, and real-time engagement analytics
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SERVICES AS A FULL STACK DEVELOPER
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- MERN Stack Development: MongoDB, Express.js, React.js, Node.js
- MEAN Stack Development: MongoDB, Express.js, Angular, Node.js
- PERN Stack Development: PostgreSQL, Express.js, React.js, Node.js
- AI SaaS Full Stack Development: LLM integrations, OpenAI API, multi-agent systems
- Full Stack SaaS Development: Subscription billing, multi-tenancy, RBAC, dashboards
- React Developer Services: Component architecture, Next.js SSR/SSG, performance optimization
- Node.js Backend Development: REST APIs, GraphQL, microservices, background jobs
- Full Stack Web Development: End-to-end product builds from design to deployment
- API Integration Specialist: Stripe, PayPal, OAuth, third-party services
- Full Stack Bug Fixing: Performance issues, broken flows, legacy code rescue
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INDUSTRIES SERVED
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SaaS platforms
Fintech
Trading platforms
HR tech
Social media tools
E-commerce
Healthcare IT
Education technology
Startup MVPs
Enterprise dashboards
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CONTACT & CALL TO ACTION
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If you are looking for a Full Stack Developer who communicates clearly,
ships on schedule, and treats your codebase like it matters,
send a message or use the invite button — I typically respond within a few hours.
P.S.: New clients, click Invite in the top-right corner.
I respond to invites within an hour.
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SEO KEYWORDS
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Full Stack Developer | Full Stack Web Developer | MERN Stack Developer |
MEAN Stack Developer | PERN Stack Developer | React Developer | Node.js Developer |
Next.js Developer | TypeScript Developer | JavaScript Developer |
Full Stack AI Developer | SaaS Developer | Web Application Developer | API Developer
Steps for completing your project
After purchasing the project, send requirements so Ahmad Hassan can start the project.
Delivery time starts when Ahmad Hassan receives requirements from you.
Ahmad Hassan works on your project following the steps below.
Revisions may occur after the delivery date.
Discuss your project
Before placing order, client will discuss his project in detail with me and then we will decide the steps to take this project further.