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.

View Featured Project Contact Me

Location: Springfield, VA
Degree: M.S. Computer Science
Focus: Web apps + APIs

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.

Dec 2025 - Current

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.

Mar 2025 - Nov 2025

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.

Sep 2024 - Nov 2024

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 Tablet Menu App, QR Ordering & Kitchen Print System

A complete restaurant table flow that starts on the tablet: guests browse the digital menu board, scan the QR code, order and pay from their phone, then staff accept the order and send the ticket to the kitchen printer.

Download Tablet APK Live Customer Demo Admin Dashboard

Project Part 1 · Tablet Menu Board

The tablet menu board is the start of the same restaurant system.

This is not a separate app from the QR ordering website. The tablet is the first customer-facing touchpoint: guests browse the digital menu board, switch languages, look through food photos, and scan the always-visible QR code when they are ready to order from their phone.

Premium Tablet Templates

Three-page restaurant menu templates for steakhouse, Korean dining, and Asian fusion concepts.

Free Layout Editing

Restaurants can manually position text, prices, food photos, logos, and QR areas.

Touch Manager Tools

Managers can update menu copy, prices, photos, QR image, and ordering URL directly from the tablet UI.

Bilingual Menu Sync

Template mode keeps Korean and English pages aligned, while free layout mode can be edited per language.

Fast Asset Loading

Menu data and images are preloaded so first entry, page turns, and language switching feel smooth.

QR Order Handoff

The QR area stays visible across the menu pages and sends guests into the phone ordering website.

Project Part 2 · QR Ordering Website

The phone website handles ordering, Stripe payment, admin review, and kitchen printing.

After guests scan the QR code from the tablet menu, the web app takes over: table-aware ordering, bilingual menu browsing, cart review, secure Stripe Checkout, live staff order management, table QR generation, and CloudPRNT kitchen ticket dispatch.

Table QR Entry

Guests land on a table-specific mobile ordering page after scanning the tablet QR.

Mobile QR ordering menu list with food photos and add to cart buttons

Photo Menu + Cart

Bilingual menu categories, item photos, quantity selection, cart review, and order notes.

Cart Review

Guests review quantities, notes, subtotal, tax, and total before opening Stripe Checkout.

Stripe Checkout

Card payments are handled through secure Stripe Checkout before staff receive the paid order.

Restaurant admin order dashboard showing accepted orders and totals

Admin Order Board

Staff review paid orders, accept tickets, complete orders, and track table/order status.

QR manager screen showing table-specific QR codes

Table QR Manager

Each table gets its own QR URL so orders can be traced back to the correct table.

KITCHEN ORDER

================================
Order #27
Table: T1
Paid: CARD
Time: 08:40 PM
--------------------------------
1x Dumpling Soup
   만두스프
4x Steamed Dumplings (6 pcs)
   슈마이
--------------------------------
Subtotal $39.95
Tax      $4.00
Total    $43.95
================================

CloudPRNT Kitchen Ticket

Accepted orders create Star CloudPRNT dispatch jobs so a compatible kitchen printer can output the ticket.

Build Details

The implementation behind the restaurant system.

Shared Restaurant Data Model

Stores, tables, menu items, menu assets, order records, language state, and QR URLs are handled as one connected system.

Android Tablet Runtime

The menu board is packaged as an Android APK with portrait tablet UX, local asset caching, and smooth page switching.

Bilingual Template Rules

Template mode keeps Korean and English pages synced, while free layout mode allows language-specific manual edits.

QR Ordering Pipeline

Every table QR opens a table-aware mobile ordering flow with menu browsing, cart review, and Stripe Checkout.

Staff Operations

The admin dashboard gives staff a live order board for paid orders, table context, status changes, and daily review.

Kitchen Print Dispatch

Accepted orders create CloudPRNT dispatch jobs so a compatible kitchen printer can output the ticket automatically.

Project Tech Stack

Tools used in this project.

Next.js React TypeScript Tailwind CSS Supabase PostgreSQL Stripe Star CloudPRNT Vercel Capacitor Android Tablet UX 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.