Software Engineer · Circle POS
Worked on restaurant-focused web tools, including digital menus, QR ordering flows, API integrations, POS database communication, and performance fixes for mobile and tablet screens.
Software Engineer
Woochang Chang
I build full-stack web applications with React, Next.js, APIs, and databases. Lately, most of my work has been around restaurant and POS-related tools, including QR ordering, digital menus, admin dashboards, and payment flows.
What I Work On
I like making the whole flow work, not just one screen.
My recent work usually sits between the frontend, API layer, database, and the parts of the product staff actually use during a busy day.
MS
Computer Science
1.5+
Years experience
UI + API
Product flows
About
I care about the details that make web apps feel dependable.
I am a software engineer with hands-on experience building and debugging full-stack web applications. I spend a lot of time on the parts that are easy to miss: API responses, database records, async UI state, edge cases, and performance on mobile or tablet screens.
My recent projects have been close to restaurant technology: digital menus, QR ordering, POS/database integration, and admin tools that staff can use without needing to think about the technical pieces underneath.
Skills
The tools I have been using most often.
JavaScript
TypeScript
React
Next.js
HTML
CSS
Node.js
REST APIs
Python
Java
C
SQL
Microsoft SQL Server
Supabase
Stripe
Git
GitHub
Linux
Experience
Recent work.
Software Engineer · World Bankcard Services
Built parts of a Korean taxi dispatch platform with React, Google Maps API, REST APIs, ride tracking, driver matching, and debugging work around async data flow.
Software Engineering Intern · Atom Tech Solutions
Developed a Yelp-like web application using Node.js, Express.js, MongoDB, HTML, CSS, and EJS while implementing backend APIs and improving frontend usability.
Featured Project
Restaurant QR Ordering & Kitchen Printing Platform
A QR ordering system I built to test how a small restaurant could take table orders, accept card payments, manage orders from a dashboard, and send accepted orders to a kitchen printer.
Demo video: QR order, Stripe checkout, admin acceptance, and kitchen ticket output.
Overview
The goal was to make the restaurant flow feel connected.
Customers scan a table QR code, browse the menu, place an order, and pay online. After payment, the order shows up in the admin dashboard for staff to accept or cancel.
When staff accept the order, the app creates a kitchen print job. I wanted this to feel closer to how a small restaurant would actually use it, instead of stopping at a simple demo checkout page.
Problem
Small restaurants do not need more manual steps.
If ordering, payment, order review, and kitchen tickets live in separate places, staff have to fill in the gaps by hand. That gets hard to manage quickly when orders start coming in.
Solution
One web flow from table QR to kitchen ticket.
I connected the steps with Next.js, Supabase, Stripe, and Star CloudPRNT. Each table has its own URL, paid orders show up in the dashboard, and accepted orders are queued for the kitchen printer.
Order Flow
How an order moves through the app.
01
Scan Table QR
Each table uses its own QR link, so the order keeps the table context.
02
Order & Pay
The customer places the order and pays by card through Stripe Checkout.
03
Accept Order
Staff review the paid order in the dashboard and accept or cancel it.
04
Print Ticket
Accepted orders become CloudPRNT jobs for the kitchen printer.
Key Features
The main parts I built.
Table-Specific QR Ordering
Each table has a separate QR link, so the dashboard can show where the order came from.
Stripe Checkout
Customers can complete payment by card before the order goes to the staff dashboard.
Admin Order Dashboard
Staff can accept, cancel, complete, and review orders without touching the database.
Daily Sales History
The history page shows daily revenue and order details by selected date.
Kitchen Printer Dispatch
Accepting an order creates a CloudPRNT job that a compatible kitchen printer can poll.
Production Deployment
The project is deployed on Vercel with a custom domain and server-side API routes.
Project Tech Stack
Tools used in this project.
Next.js
React
TypeScript
Tailwind CSS
Supabase
PostgreSQL
Stripe
Star CloudPRNT
Vercel
GitHub
Contact
I am open to software engineering roles.
I am especially interested in full-stack web applications, API integrations, payment systems, database-backed products, and restaurant/POS technology. You can reach me at woochangchang@gmail.com.
Project Highlight