I build web platforms
and AI agents that ship.
Senior Full Stack Engineer & AI Applications Developer — React, Node and TypeScript on one end; LangChain, LangGraph, RAG and agentic systems on the other.
Engineer first. AI-native by practice.
I'm a Senior Full Stack Engineer with deep experience building scalable web platforms and intelligent systems. My work spans both ends of the stack — React, Node.js, MongoDB and SQL — as well as advanced AI integrations using OpenAI, LangChain, LangGraph and Retrieval-Augmented Generation.
My specialty is agentic AI: autonomous systems that reason, plan and take action — from LLM-powered assistants to AI woven into real-world workflows, wrapped in robust, production-grade APIs.
I've shipped for startups, healthcare platforms, ML-integrated identity verification tools and analytics dashboards — and I'm a Top Rated Plus developer on Upwork.
Technologies I work with daily
The toolkit behind everything I ship — from pixel to pipeline to prompt.
Where I've built things
Senior Full Stack Engineer · PrivateID
Sep 2022 – PresentIntegrating Machine Learning models into ID verification workflows, enhancing system efficiency and accuracy. Built a configurable rules builder that lets users customize verification workflows to their exact requirements — significantly expanding the product's capabilities in secure identity verification.
React Developer · Atentiv LLC
Sep 2021 – Sep 2022Built and managed a comprehensive Patient Management Portal with React, TypeScript and Material UI — serving patients, caregivers, physicians and admins. Created interactive D3.js data visualizations as reusable React components, powering the platform's analytics.
JavaScript Developer · Jslytics
Mar 2020 – Sep 2021Implemented server-side tracking with Google Tag Manager, developing custom JavaScript variables to transform data before it reached analytics platforms. Integrated enterprise web applications with HubSpot, Salesforce and other marketing stacks for precise data tracking.
Fullstack JavaScript Developer · Independent Contractor
Sep 2019 – Mar 2021Delivered ~40 projects for clients worldwide across healthcare, ecommerce and edtech — earning Top Rated Plus status on Upwork with a 100% Job Success Score, using JavaScript, TypeScript, React, Node.js, Next.js, Firebase and MongoDB.
What people say after we ship
Haroon is a great UI/UX developer. He has worked well with our distributed teams to build out the world's best ADHD digital therapeutic solution. Without his knowledge and creativity we would never have been as successful.
Haroon does excellent work and looks for alternative solutions. He is a great team player and has a positive attitude. I highly recommend him.
Great freelancer, thanks so much! Great communication and delivery.
Let's build something intelligent.
A million people know how to code. Far fewer listen carefully, follow up promptly, hit deadlines, and explain the work without jargon. I aim to be both — strong execution, easy collaboration.