Kay Wu

Hi, I’m Kay.

I build web applications and backend systems that solve real problems.

I'm a full-stack software engineer with 4+ years of backend, web, and mobile experience using .NET 8, Vue 3, React, TypeScript, Flutter, and React Native. I own features end to end, from database schema and API design to web and mobile UI, code review, and production release.

View Projects GitHub Resume (PDF) (opens in a new tab)
Profile summary
Drawn byZhongyu (Kay) Wu
TitleFull-Stack Software Engineer
LocationLos Angeles, California
Core stack.NET 8 · Vue 3 · React · TypeScript · Flutter · React Native · PostgreSQL
Sheet01 of 05

Section A — 01 / Projects

Personal Projects

Applications and developer tools I designed and built on my own, with live demos and public source code.

All projects

Detail 01 · AppLive demo available

Agents Office hosted Demo showing a labeled sample workflow and disabled uploads

Agents Office

A multi-agent software engineering orchestrator that turns a feature request into a task plan and coordinates Claude Code or OpenAI Codex agents. Fresh sessions and compressed handoffs cut token usage by 86%.

Category
Developer Tool
Context
Personal project · Public source code
Role
Tool design and implementation
  1. Node.js
  2. Express
  3. WebSocket
  4. Claude Code
  5. OpenAI Codex

Not compatible with mobile. Please open the demo on a desktop browser.

Live Demo GitHub for Agents OfficeView Case Study for Agents Office

More projects — Details 04–06

Games

Three earlier game projects, including collaborative Unity work.

Detail 04 · GameBrowser game

The Traveler gameplay showing a pixel-art forest and player character

The Traveler

A Bitsy narrative game about finding the way home, with three different terrains and play styles.

Context
Game project
Role
Game development
  1. Bitsy
  2. Narrative design
  3. Level design

Not compatible with mobile. Please open the game on a desktop browser.

Play Game GitHub for The Traveler

Detail 05 · GameBrowser game

The Hungry Sheep running in Unity WebGL with Original and Variant modes

The Hungry Sheep

A team-built 2D puzzle game with original and variant play modes, music, and sound effects.

Context
Three-person team project
Role
Design, coding, and testing with teammates
  1. Unity 2D
  2. C#
  3. WebGL

Not compatible with mobile. Please open the game on a desktop browser.

Play Game GitHub for The Hungry Sheep

Detail 06 · GameBrowser demo

Tower Defense gameplay showing turrets, approaching enemies, coins, and lives

Tower Defense Game Demo

A Unity 3D team demo that transitions from collecting coins to tower-defense mechanics.

Context
Team project · Based on the Brackeys tutorial
Role
Team implementation with Anvita Warty
  1. Unity 3D
  2. C#
  3. WebGL

Not compatible with mobile. Please open the game on a desktop browser.

Play Game GitHub for Tower Defense Game Demo

Section B — 02 / Experience

Experience

Building useful software, across the stack.

  • ★ UnlockedRef 1.1

    15,000+

    mobile users reached

  • ★ UnlockedRef 1.2

    2,000+

    additional weekly trades

  • ★ UnlockedRef 1.3

    100+

    weekly auth support issues cut

  • ★ UnlockedRef 1.4

    20%

    saved on IT costs

Nexus Point Group

Cascadia Capital Corp

Engineering team supporting Bacera FinTech brokerage platforms.

Role
Software Engineer
Period
April 2023 — Present
Location
Alhambra, CA
  1. Reached 15,000+ mobile users by developing, launching, and maintaining a customer-facing Flutter app for iOS and Android, contributing to both the Flutter client and backend APIs and shipping ongoing releases, bug fixes, and feature updates.
  2. Drove 2,000+ additional weekly trades by designing and building a customer rewards platform end to end across backend, web, and mobile, including points, loyalty tiers, product catalog, and order fulfillment.
  3. Cut 100+ weekly authentication-related support issues by implementing Two-Factor Authentication (2FA) with TOTP authenticator apps across API, web, and mobile, covering enrollment, verification, disablement, and login.
  4. Saved 20% on IT costs by replacing a third-party email platform with an in-house scheduled bulk email service (C#, Hangfire, AWS SES, S3), supporting multilingual templates, attachments, send-status tracking, and subscription preferences.
  5. Designing and implementing a real-time customer support chat platform across backend, web, and mobile, defining the WebSocket communication architecture, Redis Pub/Sub message routing, PostgreSQL data models, and end-to-end client workflows.
  6. Developed and maintained Laravel (PHP) customer-facing websites and REST APIs, including multi-region and marketing-content features; built Artisan commands for scheduled data synchronization and reporting.

Ni Hao Chinese

Websites, internal applications, and reporting tools for company operations.

Role
IT Developer
Period
August 2021 — December 2022
Location
Torrance, CA
  1. Contributed to a 20% improvement in teacher performance by building interactive Google Data Studio (now Looker Studio) dashboards on MySQL and BigQuery to track company operations and teacher metrics.
  2. Built and maintained 4 company websites and internal applications using WordPress, HTML, CSS, and JavaScript, turning business requirements into production features and operational tools.

Section C — 03 / Skills

Technical Skills

A practical toolkit for building and shipping applications.

Technical skills by area
ItemAssemblyComponentsQty
C1LanguagesC# · TypeScript · JavaScript · PHP · Dart · Python · SQL7
C2Frontend & MobileVue 3 · React · React Native / Expo · Flutter · Next.js · Electron · HTML / CSS · Tailwind CSS8
C3Backend.NET 8 / ASP.NET Core · Node.js / Express · Laravel · WordPress · REST APIs · WebSockets · Hangfire7
C4DataPostgreSQL · MySQL · Redis · Entity Framework Core4
C5Cloud & DevOpsAWS (SES, S3, SQS, CloudWatch) · Google Cloud / GCP (BigQuery) · Docker · Nginx · Git · GitHub Actions · CI/CD7
C6AI & Developer ToolsClaude Code · OpenAI Codex · OpenAI API · Multi-agent orchestration · LLM context and token management5

Professional work centers on .NET, Vue, React, Laravel, and Flutter/React Native. This portfolio is built with React, Next.js, TypeScript, and Tailwind CSS.

Section D — 04 / About

About Me

Los Angeles, California

General notes

  1. I’m a full-stack software engineer based in Los Angeles. I enjoy working across the stack, understanding how systems fit together, and turning requirements into working software.
  2. Most of my experience is in building customer-facing applications and backend systems, and I’ve recently been exploring AI-assisted development and tools that make software engineering workflows more efficient.
  3. Online, I go by catfly. It’s the handle I’ve used for years in games and across the web, which is why this site lives at catfly.dev and my GitHub is catflyx520.

Education

California State Polytechnic University, Pomona

B.S. Computer Science · 2021

A.S. Mathematics · East Los Angeles College · 2019

View my resume (PDF, opens in a new tab)

Section E — 05 / Contact

Let’s connect.

Interested in my work or want to discuss a software engineering opportunity? Feel free to reach out.

LinkedIn GitHub Resume · PDF (opens in a new tab)