Sam CHAUWelcome to my homepage! I'm a System Analyst in the IT industry with five years of experience, specializing in requirements analysis, solution design, and end-to-end delivery of web applications. I also take on select freelance projects, partnering with teams to ship practical, business-ready solutions.
ProjectA selection of projects I've worked on:
This is a game center web app built with Next.js. It allows users to compete against each other in various Unity WebGL games.
This is a social platform web app built with Next.js. It allows users to share their thoughts and log in as a virtual avatar in a 3D world.
This is a Zi Wei astrology web system that generates personalized birth charts from simple inputs.
These are an add-on event pages that demonstrate some mobile-based web designs.
These are sample landing page designs I created.
Working EXP- Delivered multiple React.js/Next.js web apps—including landing pages, user dashboards, and e-commerce pages—established a component-based design system with reusable hooks and implemented dynamic routing with internationalization (i18n) support.
- Led frontend integration for a merchant system covering Apple Pay, PayPal, and cryptocurrency wallets, delivering unified checkout flows, secure client side validation, and real time payment status notifications to users.
- Built bi directional data communication among web frontend, backend services, and Unity WebGL: used RESTful APIs for data operations and WebSocket for real time events and implemented a JS–Unity bridge to pass authenticated user/session and gameplay state for scene initialization and synchronization.
- Implemented authentication with email/phone OTP and social logins (Google/X); issued short lived JWT access tokens with refresh tokens, stored in secure, HttpOnly, SameSite cookies with explicit expirations; added token rotation, CSRF protection, and OTP rate limiting.
- Ensured responsive behaviour by building a component driven UI/UX with modular Sass (SCSS) for desktop, laptop, and mobile; applied reusable mixins, a consistent breakpoint strategy, and CSS Grid/Flexbox layouts.
- Maintained and enhanced a Discord community bot leveraging webhook automations and user invoked slash commands to deliver automated summary reports to admins and customer service.
- Participated in Unity game design reviews and prototyping; conducted structured playtesting on internal developer builds and TestFlight; delivered actionable UX findings, balance/tuning feedback, and defect reports (with reproduction steps, logs, and video) to drive iteration.
- Monitored production via GitOps with Argo CD, ensuring application health and sync integrity, early drift detection, and transparent rollout tracking to safeguard releases.
- Deployed Solidity smart contracts on Ethereum and BNB Chain (EVM) and Anchor based programs on Solana; managed both testnet and mainnet releases, contract verification (Etherscan/BscScan/Solscan), and on chain/off chain integrations.
- Tracked team progress and dependencies; re prioritized scope and adjusted schedules to keep delivery on track, with timely stakeholder communication.
ContactI'm always looking for new opportunities and collaborations. Feel free to reach out to me via: