USMAN ZAFAR

Usman Zafar

Senior Full Stack Engineer | AI Agents & LLM SaaS, Chatbots, RAG | MERN, MVP

Specialized in taking products from idea and architecture to production, deployment, and ongoing operations with deep expertise across React, Node.js, TypeScript, AI/LLM integrations, cloud infrastructure, payments, and mobile development.

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About Me

Full-Stack Engineer | Building Scalable, High-Performance Web Applications

I’m a Senior Full Stack Engineer with 13+ years of experience building web, SaaS, and AI products. Strong experience with React, Node.js, and TypeScript, along with AI/LLM integrations, databases, cloud infrastructure, and payment systems. Worked with clients across the US and Europe, building products for industries including fintech, e-commerce, logistics, hiring, and healthcare.

Focused on turning ideas into reliable, production-ready products, from architecture and development to deployment and ongoing improvements. Experience includes AI-powered applications, SaaS platforms, browser extensions, and complex web applications, with a focus on building practical solutions that solve real problems and deliver a smooth user experience.

  • AI & LLM Integration
  • SaaS Product Engineering
  • React, Next.js & TypeScript
  • Node.js & API Development
  • Full-Stack Development
  • Database Architecture
  • Payment System Integration
  • Cloud Infrastructure & DevOps

Email Us

usman@stackonn.com

Make A Call

+92 303 5153574

SaaS

AI LLM

database

Angular

Node Js

Popular Services

My Special Service For your Business Development

WordPress Development

We build custom WordPress websites, themes, and plugins that are fast, secure, and SEO-friendly. Our solutions ensure smooth performance, full customization, and seamless third-party integrations for businesses, blogs, and e-commerce stores.

AWS & Firebase Integration

We integrate AWS (EC2, S3, Lambda) for scalable cloud hosting and Firebase for real-time databases, authentication, and push notifications, ensuring high performance, security, and seamless cloud-based infrastructure.

Back-End & API Development

We specialize in Node.js for real-time apps and Laravel for structured MVC-based development. Our back-end solutions ensure secure authentication, database management, and high-performance APIs for scalable web and mobile applications.

Full-Stack Development

We provide complete front-end (React, Angular, Vue.js) and back-end (Node.js, Laravel) solutions. Our full-stack expertise ensures seamless integration, robust APIs, scalable architecture, and high-performance applications for diverse business needs.

SaaS Product Development

Developing complete SaaS products from initial architecture to production, including user authentication, subscriptions, payment systems, real-time functionality, dashboards, and scalable backend infrastructure. Experience includes building production SaaS platforms used by real customers across different industries.

AI & LLM Integration

Building AI-powered applications using OpenAI, Google Gemini, Claude, and Groq, with experience in RAG pipelines, multi-provider AI architectures, prompt engineering, and AI cost and latency optimization. AI features are integrated into real products with a focus on useful, reliable, and cost-effective results.

React

90%

SaaS

90%

Angular

95%

Cash Flow

88%

AI LLM

95%

SQL

95%

Docker

85%

Node Js

95%

Payments

80%

mongoDB

80%

My Skills

Full-Stack Development | Scalable Web & SaaS Solutions

As a Senior Full Stack Engineer, I specialize in building scalable, production-ready web and SaaS applications using React, Next.js, Node.js, and TypeScript. From creating modern and intuitive front-end experiences to designing robust backend systems, APIs, databases, and integrations, I provide complete solutions built for real-world use. With strong experience in AI and LLM integrations, cloud infrastructure, payment systems, and real-time applications, I focus on building reliable products that perform well, scale effectively, and solve real business problems.

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Explore My Popular Projects

Next-Gen SaaS Solutions: Powering Productivity & Performance

Turning LinkedIn, X & Upwork into a Smarter Client Pipeline

Replyze – AI Sales Copilot
Replyze is an AI-powered sales copilot designed for founders, freelancers, and professionals looking to find better leads and win more work on LinkedIn, X, and Upwork. It reads the content already on screen, scores opportunities based on relevance and client quality, and generates personalized replies, proposals, connection notes, and follow-ups in the user’s own voice — without requiring constant copy-and-paste between different tools.

Key Features & Functionalities:

✓ Upwork Job Scoring : Analyzes jobs, client information, budgets, reviews, screening questions, hiring history, and other available signals to provide an instant fit score and an Apply, Maybe, or Skip recommendation.

✓ AI Proposal Generation : Generates multiple proposal angles, hooks, screening-question answers, and short video scripts based on the specific job and the user’s profile.

✓ LinkedIn Lead Scoring : Scores LinkedIn profiles against an ideal client profile and recommends whether to reach out, along with personalized connection notes based on the person’s actual profile.

✓ Smart Replies : Detects posts, comments, and messages on LinkedIn and X and generates relevant replies in the user’s preferred tone and writing style.

✓ Profile Optimization : Analyzes an Upwork profile, identifies areas that need improvement, and generates optimized titles and profile overviews without inventing experience or achievements.
✓ Proposal Rewriting : Allows users to paste an existing proposal and receive a tighter, more effective version along with feedback on what can be improved.

✓ Lead Management : Saves potential leads and moves them through a five-stage pipeline with personal notes, follow-up tracking, and reminders for leads that are going quiet.

✓ LinkedIn Feed & Engagement : Filters the LinkedIn feed to surface relevant posts, identifies valuable engagement opportunities, and generates comments and outreach messages based on relevance.

✓ Client Discovery : Users can define their ideal client and generate targeted searches to discover potential buyers instead of wasting time on irrelevant profiles or recruiters.

✓ Content Generation : Generates LinkedIn and social media posts from a simple idea, including hooks and content written in the user’s preferred voice.

✓ Job & Content Safety Checks : Identifies potentially risky Upwork posts involving off-platform communication, upfront fees, personal document requests, or external payment requests before users spend time or Connects.

✓ Privacy by Design : Personal posts, profiles, messages, and jobs are not stored by default. The product works with content available on the user’s screen and only saves pipeline information that the user chooses to keep.

Tech Stack : WXT, React, TypeScript, Hono, Node.js, Supabase, PostgreSQL, Redis, SwiftUI, Gemini, OpenAI, Groq, Paddle, Apple In-App Purchase, Cloudflare, Coolify, Sentry, PostHog

This project combines AI, browser-extension development, full-stack engineering, and product infrastructure into a single tool focused on helping users spend less time searching and more time on opportunities that actually matter. Replyze is built as a commercial product with live users, real billing, multi-provider AI failover, and production infrastructure.

Turning Customer Conversations into Actionable Market Intelligence

GlobalInsight.ai — AI-Powered Market Intelligence Platform
Full-stack SaaS that delivers structured market-intelligence reports in minutes by scraping and analyzing real customer conversations across YouTube, news, forums, and web communities. A multi-stage AI pipeline extracts ranked pain points, competitor gaps, and opportunity signals with a 6-dimension scoring system, delivered as downloadable PDF reports. Includes 15-day caching, real-time progress tracking, and credit-based Stripe billing. Live with real users.
Tech stack: Node.js, Express, Python, React, Firebase, PostgreSQL, Stripe, Socket.IO, Claude API, Gemini API, yt-dlp.

Key Features & Functionalities:

✓ AI-Powered Market Analysis : Multi-stage AI pipelines analyze customer conversations and identify important pain points, competitor gaps, and potential market opportunities.

✓ Multi-Source Data Collection : Scrapes and analyzes content from YouTube, news sources, forums, and web communities to gather real customer insights.

✓ 6-Dimension Scoring System : Insights are evaluated across six dimensions to rank and prioritize the most valuable pain points and opportunities.

✓ Structured PDF Reports : Generates downloadable market-intelligence reports containing organized insights, rankings, and analysis.
✓ Real-Time Progress Tracking : Socket.IO-powered real-time updates allow users to track the progress of data collection and AI analysis.

✓ Credit-Based Billing : Stripe integration provides a credit-based payment system for accessing market-intelligence analysis and reports.

✓ Smart Caching : 15-day caching reduces unnecessary processing and helps improve performance while controlling AI and data-processing costs.

✓ AI Model Integration : Integrated Claude and Gemini APIs to power different stages of the market-analysis and insight-generation pipeline.

✓ Full-Stack SaaS Architecture : React-based frontend with Node.js, Express, Python, Firebase, and PostgreSQL supporting the complete platform workflow.

Tech Stack : Node.js, Express, Python, React, Firebase, PostgreSQL, Stripe, Socket.IO, Claude API, Gemini API, yt-dlp

This project brought together full-stack SaaS development, AI engineering, data scraping, real-time processing, and cloud infrastructure to create a production-ready market-intelligence platform. The result is a system that turns real customer conversations into structured, actionable insights that help businesses identify problems, understand competitors, and discover new opportunities.                                                                

Transforming Fintech Hiring with AI-Powered Recruitment Solutions

Finjobsly — AI-Powered Fintech Hiring Platform
Three-sided AI hiring marketplace built exclusively for fintech — candidates, employers, and admins. Candidates get AI resume scoring and personalized job matches; employers manage postings, applicant pipelines, and team access; admins control analytics, content, AI monitoring, and Stripe revenue. Real-time AI chat, daily job alerts, achievements, and a job scraper. Production-grade, live, and serving real users. Tech stack: React 19, Tailwind CSS, Node.js, Firebase (Firestore, Auth, Cloud Functions, Realtime DB, Hosting, Storage), Google Cloud Vertex AI, Stripe, Nodemailer.
 

Key Features & Functionalities:

✓ AI Resume Scoring & Job Matching : AI-powered resume analysis that evaluates candidates and provides personalized job matches based on their skills and profiles.

✓ Employer Portal : Tools for employers to create and manage job postings, review applicants, manage hiring pipelines, and control team access.

✓ Admin Dashboard : Centralized management of users, platform analytics, content, AI monitoring, and Stripe revenue.

✓ Real-Time AI Chat : Interactive AI-powered chat functionality to help users with hiring and job-related queries in real time.

✓ Daily Job Alerts : Automated job notifications that keep candidates updated with relevant opportunities based on their profiles and preferences.

✓ Job Scraper : Automated job discovery system that collects relevant fintech opportunities and makes them available to candidates on the platform.

✓ Achievements & User Engagement : Built-in achievements and engagement features designed to encourage users to actively participate and complete their hiring journey.

✓ Secure Payments : Stripe integration for managing platform revenue and payment workflows.

✓ Firebase Infrastructure : Firebase Firestore, Authentication, Cloud Functions, Realtime Database, Hosting, and Storage used across the platform for data, authentication, backend functionality, real-time features, and deployment.

✓ AI & Cloud Integration : Google Cloud Vertex AI integrated to power intelligent hiring and AI-driven platform features.

Tech Stack : React 19, Tailwind CSS, Node.js, Firebase, Google Cloud Vertex AI, Stripe, Nodemailer This project brought together full-stack development, AI engineering, cloud services, real-time functionality, and fintech-focused hiring workflows to create a production-ready platform serving real users. The result is a complete AI-powered recruitment ecosystem designed to make hiring and job discovery more efficient for candidates, employers, and platform administrators.

Revolutionizing Grocery Shopping with AI-Powered Digital Solutions

QuikPantri – B2B/B2C Grocery E-Commerce Platform

I had the opportunity to work on QuikPantri, a production-ready B2B/B2C grocery platform designed to deliver a seamless 24/7 online shopping experience. Built with the MERN Stack and integrated with native mobile apps for iOS and Android, the platform combines powerful e-commerce capabilities with real-time communication and secure payment processing.

Key Features & Functionalities:

✓ B2B & B2C Functionality : Dedicated vendor/admin portals for managing products and orders, alongside a customer-facing web and mobile experience.

✓ Admin Dashboard : Comprehensive tools to manage orders, inventory, users, and analytics.

✓ Real-Time Chat & Notifications : Instant communication and updates via Firebase and FCM.

✓ Secure Payments : Stripe integration with saved payment methods for quick, safe checkout.

✓ Cross-Platform Access : Fully responsive web portal plus native apps in Swift, Kotlin, and Java.

✓ Optimized Infrastructure : VPS hosting with Nginx, PM2, SSL encryption, automated backups, and monitoring.

✓ Database & Transactions : MongoDB with transactional support for consistent and reliable data operations.

✓ Complex Issue Resolution : Addressed challenges like payment/order synchronization, FCM token handling, and MongoDB transaction conflicts.

This project was a challenging and rewarding experience, bringing together full-stack web development, mobile engineering, and DevOps to create a secure, scalable, and user-friendly grocery platform for both businesses and consumers.

Transforming Healthcare with AI-Powered Digital Solutions

AI Med Connect – AI-Powered Telemedicine & Healthcare Platform

I had the opportunity to work on AI Med Connect, a modular B2B/B2C telemedicine platform designed to enhance healthcare services with artificial intelligence and advanced digital tools. Built with Angular, Node.js/Express, and MongoDB, and powered by AI models in Python, the platform delivers secure, real-time, and predictive healthcare experiences for patients, doctors, and administrators.

Key Features & Functionalities:

✓ AI-Based Disease Prediction Symptom : based health predictions using Python, TensorFlow, and Scikit-learn machine learning models.

✓ Real : Time Communication Secure video consultations and instant chat via WebSocket and Agora SDK.

✓ B2B & B2C Modules : Dedicated portals for doctors/admins and patients.

✓ Smart Healthcare Services : Appointment booking, lab test scheduling, e-prescription management, and blood donor matching.

✓ Online Pharmacy : Medicine ordering with integrated delivery tracking.

✓ Role-Based Dashboards : Custom dashboards for patients, doctors, and admins for optimized workflows.

✓ Secure Infrastructure : JWT authentication, HTTPS encryption, backups, and scalable deployment.

✓ Cross-Platform Accessibility : Fully responsive design with Angular Material and Tailwind CSS for desktop and mobile use.

This project was a rewarding challenge, combining AI innovation, secure telemedicine technology, and scalable architecture to deliver a future ready healthcare solution that bridges the gap between patients and providers.

 

Transforming Logistics with Smart Digital Solutions

SparTrans – A Comprehensive Transport & Logistics Management SaaS

I had the opportunity to work on SparTrans, a powerful SaaS platform designed to optimize transport and logistics operations. Developed for SparTrans GmbH, a leading European logistics provider, this system enhances workflow efficiency through robust digital solutions.

Key Features & Functionalities:

✓ User Management: Manage company employees, subcontractors, and drivers with detailed profiles and access control.

✓ Profile Management: Comprehensive driver and employee profiles, including registration details, insurance, and document tracking.

✓ App Logs & Activity Tracking: Real-time tracking of user activity, system interactions, and operational logs for transparency.

✓ Subcontractor Management: Streamlined handling of external logistics partners and third-party service providers.

✓ Roles & Permissions: Customizable access levels to ensure secure and role-based access to the system.

✓ Location & Fleet Management: Track vehicle movements, locations, and transport operations efficiently.

✓ Document Management: Secure storage and retrieval of essential documents, including passports, permits, and insurance papers.

✓ Task Management (ToDo & Departments): Assign and manage tasks efficiently across different departments.

✓ Time Tracking & Attendance: Monitor employee work hours, breaks, and leaves to ensure compliance and efficiency.

✓ Live Chat & Communication: Integrated messaging system for seamless communication between employees and management.

This project was an exciting challenge, incorporating cutting-edge UI/UX and scalable backend solutions to streamline logistics operations for a major European transport company.

Bringing Imagination to Life with AI-Powered Storytelling

StoryMagician.ai – Personalized Story Creation Platform

I had the opportunity to work on StoryMagician.ai, an interactive AI-powered storytelling platform that enables parents, educators, and children to create personalized stories featuring custom characters, AI-generated plots, and stunning illustrations. Built with the MERN Stack and powered by OpenAI’s GPT technology, the platform delivers an engaging, creative, and immersive storytelling experience across web and mobile.

Key Features & Functionalities:

✓ Custom AI Workflows : Generate tailored tone, plot, and character arcs using GPT powered AI.

✓ Personalized Character Integration : Upload photos to turn children into the heroes of their own stories.

✓ Live AI Editing : Real-time GPT-assisted adjustments to story content.

✓ Voice Narration : Immersive audio storytelling for an engaging reading experience.

✓ Story Output Options : PDF downloads, high-quality prints, and keepsake-ready formats.

✓ Adaptive Reading Levels : Adjustable complexity and multilingual support.

✓ B2C & B2B Solutions : Direct offerings for families and tailored packages for schools and educational platforms.

✓ Optimized Deployment : Fully managed VPS setup with Nginx, PM2, SSL encryption, backups, and performance tuning.

This project was a rewarding experience, combining AI creativity, full-stack engineering, and UX design to craft a platform that makes storytelling more interactive, personalized, and magical for users of all ages.

Empowering Businesses with Smart User Management

DeskVantage – Advanced User & Role Management SaaS Platform

I had the opportunity to work on DeskVantage, a scalable SaaS platform designed to optimize business operations through advanced user management, reseller control, and secure role-based access. Built for high-performance and flexibility, DeskVantage enables organizations to manage staff, clients, and sub-users with complete permission control and integrated business tools.

Key Features & Functionalities:

✓ Advanced Role-Based Access Control (RBAC) : Define and customize permissions for staff, clients, and sub-users.

✓ Reseller Management : Manage resellers, assign roles, and track their performance.

✓ Project & Task Assignments : Allocate work efficiently across teams with status tracking.

✓ Financial Tracking : Monitor payments, expenses, and transactions with PayPal and credit card integration.

✓ Detailed Analytics Dashboards : Gain insights into operations, user activity, and financial performance.

✓ Secure User Management : Centralized control for adding, editing, and removing users with audit logs.

✓ Scalable SaaS Architecture : Built for performance, security, and future feature expansion.

This project was an exciting challenge, combining enterprise-level role management, financial tools, and analytics into a single platform to help businesses operate more efficiently and securely.

Employee Attendance & Productivity Tracker Website

Smart Check-In – Advanced Employee Attendance & Tracking System

Smart Check-In is a comprehensive employee tracking and attendance management system designed specifically for IT companies. It ensures efficient workforce management by providing real-time insights into employee check-ins, check-outs, breaks, working hours, and leave permissions.

Key Features & Functionalities:
✓ Employee Attendance Management – Track employee check-ins and check-outs with timestamps.
✓ Break Management – Monitor break durations and ensure productivity.
✓ Working Hours & Productivity Tracking – Get detailed insights into total working hours, productive hours, break time, and overtime.
✓ Leave & Permission Requests – Employees can request leave and permissions, which admins can approve/reject.
✓ Live Dashboard Analytics – View real-time employee status (Active, Inactive), daily/weekly/monthly working hours, and productivity reports.
✓ Late Arrivals & Overtime Tracking – Get notifications for late check-ins and track extra working hours.
✓ Export Reports – Generate detailed attendance and performance reports for HR and payroll processing.
✓ User Roles & Access Control – Admins can set different permissions for employees, team leads, and HR managers.

E-Commerce Website for Food Industry

After 5 To Go – Delicious Food on Wheels & More!

Experience mouthwatering gourmet burgers, finger-licking wings, and Southern Grilled BBQ at After 5 To Go! Part of the After 5 Social Lounge, LLC, we bring your favorite flavors directly to you with our mobile food service and physical location in Americus, GA. Whether you’re craving sizzling burgers or savory wings, we’ve got something for every taste. Join us for a delightful food experience—on wheels or dine-in!

E-Commerce Website

Akbar Aslam – Luxury Women's Ethnic Wear

Akbar Aslam is a premium women’s ethnic brand blending modern aesthetics with timeless traditions. Our handcrafted and intricately embellished dresses, designed by master artisans, showcase the finest in luxury fashion. Explore our collections, from elegant bridals to chic pret and exquisite lawn, ensuring sophistication for every occasion.

Real Estate Website

The Space City Team – Your Trusted Real Estate Experts

The Space City Team is dedicated to helping you buy, sell, or invest in real estate with care, kindness, and exceptional service. Led by Jimmy Villanueva, our team ensures a seamless experience, guiding you every step of the way. Whether you’re searching for your dream home or looking to sell, we’re here to help you “shoot for the stars” in real estate.

Real Estate Website

DealCart - Your One-Stop Shopping Destination

DealCart offers a seamless shopping experience with a wide range of categories, including fashion, skincare, baby care, tech gadgets, home essentials, and more. Enjoy exclusive deals, easy checkout, and a user-friendly interface—crafted in Pakistan for a hassle-free online shopping experience.

E-Commerce Website

Health Horizon Wellness – Integrative Virtual Care

Health Horizon Wellness provides integrative virtual care combining Functional Medicine and Quantum Energy Healing. We focus on root-cause healing, personalized treatments, and holistic wellness for chronic illnesses, all from the comfort of your home.

E-Commerce Website

Branch – Ergonomic Office Furniture for Home & Business

Upgrade your workspace with Branch’s top-rated ergonomic office furniture, designed for comfort, style, and productivity. From high-quality chairs and desks to complete workspace solutions, we offer direct-to-consumer savings, free shipping, and flexible trade-in options—trusted by 400,000+ customers and featured in Wired, Forbes, and more.

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I’ve 153+ Clients Feedback

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  • 7+ Years Of Experience
  • Professional Web Designer
  • Full-Stack Development
  • AWS & Firebase Integration

Project Achievements

Kandoo Adventures

Expert-guided treks to iconic destinations, from the Dolomites to Kilimanjaro. Start your adventure today!

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Akbar Aslam

Explore luxury ethnic wear and embrace timeless elegance with Akbar Aslam.

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Graana

Explore real estate listings and find your dream property with Graana

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DealCart

Discover great deals and shop fresh products with Deal Cart.

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FoodsInn

Experience fresh groceries and easy shopping at FoodsINN.

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USMAN ZAFAR

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  • +92 3035153574
  • usman@stackonn.com

Copyright @2025, Muhammad Usman Zafar. All Rights Reserved.

 

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