Jason Cheung — Software Engineer

01 — About

A bit about me

Hello! I'm Jason, a Computer Science major at UC Santa Cruz. My interest in programming started with a curiosity for how things work under the hood, and it's grown into a love for building software that's both thoughtful and well-crafted.

Most of what I build comes from problems I actually have. Running an e-commerce business led to an inventory sync platform for eBay and WooCommerce; studying led to StudyPet+, an AI study planner that's live today; and watching login attempts hit my NAS led to a security dashboard for Synology DSM.

I also run my own infrastructure: Dockerized web apps, WordPress sites, and an LMS behind a reverse proxy and Cloudflare, with automated off-site backups. That's where most of my systems and ops experience comes from.

Languages

TypeScript JavaScript Python SQL Bash Java C / C++

Frameworks & Data

Next.js React Node.js Prisma PostgreSQL SQLite WebGL / three.js

Infrastructure

Docker Docker Compose Nginx Cloudflare Linux Git GitHub Actions

02 — Experience

Where I've worked

Most of my hands-on experience comes from running my own business, from the storefront to the servers it runs on.

DIYGeeks

Self-employed · Morgan Hill, CA · Hybrid

Owner

Jun 2022 – Present

Moved the store's WordPress/WooCommerce site from shared hosting to self-managed Docker on OpenLiteSpeed behind Cloudflare, with a web application firewall and daily off-site backups.
Debugged a third-party shipping plugin in production and shipped fixes for a checkout fatal error and a broken OAuth callback.
Host and administer client sites on the same platform, including WordPress sites and a Canvas LMS instance.

E-Commerce Business Owner

Jul 2020 – Present

Founded and run an online store selling through eBay and WooCommerce. Keeping stock in sync across the two is what led to the Inventory Manager.
3D printing for client jobs on three FDM printers and a 16K resin printer.

Web DevelopmentSoftware DeploymentE-CommerceOnline Retail

Protech Hong Kong

Wan Chai, Hong Kong · On-site

Information Technology Specialist

Jan – Jun 2017 · May – Aug 2018

On-site computer assistance and technical support, troubleshooting hardware and software issues.

Computer AssistanceTechnical Support

03 — Work

Featured projects

Things I've built and run in production, from full-stack apps to the tooling that keeps my servers honest.

Live

StudyPet+

An AI study planner. It generates flashcards and multiple-choice quizzes from your notes and PDFs, tracks weak topics, and pulls Canvas or any ICS calendar into one schedule. It also publishes your tasks as a feed for Google, Outlook, or Apple Calendar. Study streaks and quests level up a virtual pet. Sign-in is passwordless, and AI generation falls back across providers.

TypeScriptNext.jsPrismaPostgreSQL

Code Live

v0.1.7

SecDash for Synology

A security dashboard packaged for Synology DSM 7. It maps where blocked IPs come from, tracks failed and new-country sign-ins, surfaces probed web paths, and drafts abuse reports. A minimal root collector feeds an unprivileged daemon, so the package itself never runs as root.

PythonJavaScriptSQLiteSynology DSM

Code Releases

In progress

eCommerce Inventory Manager

Self-hosted stock sync between eBay and WooCommerce. One append-only ledger is the source of truth and both channels project from it, with idempotent absolute-quantity writes so a retry can never oversell. Correctness is enforced in the database, and anything that spends money or goes public needs a person to confirm it.

TypeScriptNext.jsPostgreSQLDocker

Code

Docker Resource Monitor

An interactive terminal dashboard for running containers. It groups them by Compose project or Swarm stack and shows CPU, memory, and storage per stack against configured limits. Keyboard and mouse controls, and it works cleanly over SSH.

BashDockerLinux

Code

CSE 160: Computer Graphics

UCSC graphics coursework, from vector math and WebGL rendering up to a three.js scene. Every assignment runs in the browser.

JavaScriptWebGLthree.js

Code Live

Coursework

Courses from my Computer Science degree, heavy on systems, networking, and algorithms.

University of California, Santa Cruz

B.S. Computer Science · Crown College · Expected December 2026

Dean's Honors · 8 consecutive quarters

3.98GPA

Systems & Networking

CSE 130
Principles of Computer Systems DesignA+
Concurrency and synchronization, layering and modularity, naming, client–server and virtualized systems, and performance, with significant systems programming projects.
CSE 151/L
Advanced Computer Networks + LabA+
In-depth routing, transport, and internetworking, plus wireless, application-layer services, and network security, with a hands-on lab.
CSE 150
Introduction to Computer NetworksA
Network layers and internetworking, switching, MAC protocols and LANs, routing, congestion control, and transport protocols, with a hands-on lab.
CSE 120
Computer ArchitectureA
MIPS and RISC instruction sets, CPU design from single-cycle to pipelined, caches, virtual memory, and performance evaluation.

Algorithms, Theory & AI

CSE 101
Data Structures & AlgorithmsA+
Linked lists, stacks, queues, hash tables, trees, heaps, and graphs, with big-O analysis. All in C/C++.
CSE 102
Introduction to Analysis of AlgorithmsA-
Designing and analyzing algorithms: recurrences, lower bounds, divide-and-conquer, dynamic programming, and branch and bound.
CSE 101M
Mathematical Thinking for CSA
Modeling problems mathematically and writing rigorous proofs about algorithms, programs, and protocols.
CSE 142
Machine LearningIn progress
Classification, density estimation, Bayesian learning, regression, and online learning, with neural networks, decision trees, boosting, and nearest-neighbor methods.
STAT 131
Introduction to Probability TheoryA+
Combinatorics, random variables and joint distributions, expectation, the Law of Large Numbers, the Central Limit Theorem, and Markov chains.

Software & Graphics

CSE 115A
Introduction to Software EngineeringA+
Built StudyPet+ with a five-person team: an AI study planner with generated flashcards and quizzes, calendar sync, and a virtual pet. It's now live at studypetplus.app.
CSE 160
Introduction to Computer GraphicsA+
Built a WebGL renderer from scratch over the quarter: a shape painter, an animated jointed creature, then a voxel world with first-person controls, block building, fleeing sheep, and point and spot lighting. It ended as a three.js remake with glTF models, shadows, a skybox, and a sheep-herding mini-game.
CSE 114A
Introduction to Functional ProgrammingA
Recursion, data abstraction, higher-order functions, types and type checking, and reasoning about program correctness.

Lower Division

CSE 13S
Computer Systems and C ProgrammingA+
CSE 16
Applied Discrete MathematicsA
CSE 20
Beginning Programming in PythonA+
CSE 40
Machine Learning BasicsA+
ECE 30
Engineering Principles of ElectronicsA+
MATH 21
Linear AlgebraA+
MATH 23A
Vector CalculusA
HIS 10B
U.S. History, 1877–1977A

05 — Contact

Let's build something.

I'm always open to interesting conversations, collaborations, and new opportunities. Whether you have a question or just want to say hi, my inbox is open.

Say Hello

Jason Cheung.

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