You will get scalable React, Node.js & full stack web or SaaS applications

Name: You will get scalable React, Node.js & full stack web or SaaS applications
Availability: InStock

Yasir A. Yasir A.

4.9

Top Rated

Yasir A. Yasir A.

4.9

Top Rated

Project details

Are you looking for a reliable Senior Full Stack Developer who can build a fast, secure, and scalable web or SaaS application?

I am a Senior Full Stack Developer with 7+ years of experience in building React, Node.js, and AWS based applications for startups, SaaS companies, and growing businesses.

What I can build for you:
• Full Stack Web Applications
• SaaS Platforms (MVP to Production)
• React.js Frontend (Modern UI / UX)
• Node.js REST APIs & Backend Systems
• Authentication (JWT, OAuth, Role-Based Access)
• Database Design (MongoDB, PostgreSQL)
• API Integrations & Third-Party Services

Why clients choose me:
Clean, scalable, and maintainable code
Business-focused development approach
Clear communication & fast response
Production-ready delivery, not demo code

Whether you need a new SaaS product, startup MVP, or existing app improvement, I can help you deliver it with confidence.
Send me a message before ordering so we can discuss your project requirements.

Programming Languages

JavaScript, Python, TypeScript

Coding Expertise

Cross Browser & Device Compatibility, Localization, Performance Optimization

What's included

Service Tiers	Starter $150	Standard $360	Advanced $550
Delivery Time	2 days	4 days	6 days
Number of Revisions	1	3	5
Design Customization	-	-	-
Content Upload	-	-	-
Responsive Design	-	-	-
Source Code	-	-	-

4.9

54 reviews

91% Complete

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Senior Backend API & Integration Engineer — 24-Hour Paid Trial + 10-Day OpenReal Agent API Build

Elementor Export for Mobile Menu Fix

Web Developer Needed for Corporate Course Selling Platform very good person and skilled developer

Build MVP SaaS for AI-Powered Proposal Generation

Developer Needed for Proof of Concept (POC) Yasir conducted himself professionally throughout the project, and the work completed met expectations. While we encountered some hiccups that led to scope changes and extended timelines, both parties reached a mutual agreement to pause and resume work in the future. I would recommend Yasir and his team.

About Yasir

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AI Systems Architect | LLM Agents, Automation & Full-Stack SaaS, n8n

100% Job Success

4.9 (54 reviews)

Karachi, Pakistan - 3:25 am local time

I build AI that replaces manual work with scalable software.

For the past 8 years, I've built AI agents, AI automation, workflow automation, API integrations, and full-stack SaaS systems that turn manual bottlenecks into software that scales.

I measure success by your ROI not lines of code.

Why Clients Hire Me

🏆 Top Rated Plus (Top 1% of Upwork Talent)

✅ 100% Job Success
✅ 74+ completed projects
✅ 2,300+ hours worked
✅ $90K+ delivered for founders and global teams

I hold both a BS in Computer Science and an MBA in Finance, allowing me to bridge engineering with business outcomes. I don't just build software—I design systems that create measurable business value.

Clients trust me with projects where failure isn't an option:

AI systems that perform reliably under production load
Payment platforms that can't afford failed transactions
Automation that eliminates hours of repetitive manual work
Scalable SaaS products built for long-term growth

WHAT I BUILD
🤖 AI Agents, LLM Systems & RAG Applications
- Solutions
- Custom AI Agents
- AI Copilots
- Retrieval-Augmented Generation (RAG)
- AI Chatbots
- AI Workflows
- Knowledge Bases
- Document AI
- Vector Search
- Semantic Search
- Prompt Engineering
- AI Automation
- Technologies
- OpenAI (GPT-4o)
- Claude
- Gemini
- LangChain
- Pinecone
- Supabase Vector
- Embeddings
- File Processing

⚡ Workflow Automation & Business Process Automation
- Platforms
- n8n
- Make (Integromat)
- Zapier
- Microsoft Power Automate
- ManyChat
- Automation Solutions
- API Integrations
- CRM Automation
- Email Automation
- Marketing Automation
- Document Automation
- Google Sheets Automation
- Excel Automation
- Webhook Automation
- Event-Driven Workflows
- Third-Party System Integrations

💻 Full-Stack SaaS Development

Building scalable MERN/PERN applications using:
- Frontend
- React
- Next.js
- TypeScript
- Backend & Architecture
- Multi-tenant SaaS Architecture
- Authentication & Authorization
- Subscription Management
- Billing Systems
- Admin Portals
- Dashboards
- Responsive Applications
- SaaS MVP Development
- Production-Ready Platforms

🔗 Backend Development, APIs & System Integrations
- Backend Technologies
- Node.js
- NestJS
- Express
- Python
- FastAPI
- Django
- Backend Expertise
- REST APIs
- API Integrations
- OAuth2
- JWT Authentication
- RBAC
- Service Accounts
- OpenAPI / Swagger
- Postman
- Webhooks
- Audit Logging
- Secure API Design
- Scalable Software Architecture

💳 FinTech & Payment Integrations
- Stripe
- Stripe Connect
- Subscription Billing
- Payment Gateways
- Secure Payment Processing
- Webhooks
- Financial Workflows
- Reconciliation Logic
- KYC/KYB-aware Systems
- Compliance-focused Backend Development

🚀 No-Code & Low-Code Solutions

- When speed matters, I leverage the right tools:
- Glide
- WordPress
- Elementor
- Botpress
- Make
- ManyChat

SELECTED RESULTS
🚀 AI Proposal Generation SaaS

Built an AI-powered proposal generation platform from MVP to production featuring:

- Multi-tenant architecture
- Authentication & user management
- Subscription billing
- Knowledge-base matching
- AI-powered proposal generation
- Word & PDF export
- GPT-4o-powered AI pipeline

🎓 Learning Management Platform

Delivered a complete LMS including:

- Stripe & PayPal integrations
- Automated certificates
- Full RTL support
- Responsive UI
- Secure authentication
- Production-ready deployment

Result: The client confirmed the platform was stable and production-ready on the very first handover.

🤖 OpenAI Agent Platform

Won a paid 24-hour engineering trial against multiple senior developers before being selected to build the production platform.

Delivered:

- REST APIs
- JWT Authentication
- RBAC
- Audit Logging
- API Documentation
- Production-ready Backend Architecture

HOW I WORK
You get a Systems Architect, not just a developer.

- Every project includes
- Clear communication
- Honest technical trade-offs
- Secure architecture
- Scalable system design
- Well-documented code
- Thorough testing
- Long-term maintainability

Whether you need:

- AI Agents
- SaaS MVPs
- API Integrations
- Workflow Automation
- CRM Integrations
- AI Chatbots
- Business Process Automation
- Enterprise Platforms

I focus on delivering software that solves real business problems—not just completed tasks.

Many of my clients return for additional work, which I consider the strongest proof that the software continues delivering value long after launch.

Ready to Build?

Click "Invite to Job" or "Send Message" with a brief description of your project, and I'll explain exactly how I'd architect and deliver it.

Steps for completing your project

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

Delivery time starts when Yasir receives requirements from you.

Yasir works on your project following the steps below.

Revisions may occur after the delivery date.

Let's have a meeting to discuss details for 100% satisfaction

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

Select service tier

Starter$150

Standard$360

Advanced$550

Basic

Small React + Node.js feature / bug fix / integration

Delivery Time 2 days
Number of Revisions 1

2 days delivery — Aug 25, 2026

Revisions may occur after this date.

Upwork Payment Protection

Fund the project upfront. Yasir gets paid once you are satisfied with the work.