Cecil Choi

Final-year Bachelor of Advanced Computing & Commerce (Data Science / Finance) student at USYD with experience designing and delivering web-based and embedded systems in Agile environments using Java, Python, JavaScript/Node, and C++. Builds reliable software backed by CI/CD pipelines, automated testing, and version control, from full-stack web applications with RESTful APIs and MongoDB to embedded firmware on ESP32 microcontrollers. Experienced in Scrum delivery, sprint planning, and client-facing demos. Brings a methodical, detail-oriented approach developed through financial audit at KPMG and data-driven user research at NetEase. Eager to build, learn, and contribute to teams where strong engineering serves a purpose larger than the product itself.

• Spidey-Sense Assistive Mask, ESP32-S3, ToF Sensors, C++/Arduino, 01/01/25, Programmed an ESP32-S3 to read Time-of-Flight distance sensors over I²C and drive vibrotactile motors using PWM for obstacle alerts., Implemented smoothing and thresholding to turn noisy sensor readings into stable haptic feedback patterns validated through user testing.
• Waste Fighters Web App, Node.js, Express, MongoDB, JavaScript, REST API, 01/01/25, Developed a full-stack sustainability web application using Node.js, Express, MongoDB and Handlebars templates to let users post, browse and 'hype' waste-reduction tips., Implemented RESTful routes for tip creation, category filtering, hype meter updates and comment display, plus a dynamic homepage integrating a third-party environmental news API., Designed MongoDB schemas and server-side validation to enforce data integrity and prevent malformed requests from reaching the database layer., Added basic automated tests for server helpers and routing and used Git/GitHub for version control and code reviews.
• High-Frequency Volatility Modelling (Optiver data), Python/R, pandas, time-series, 01/01/24, Forecast 1-2-minute volatility on 200k+ rows of order-book and trade data using a HAV-style model with rolling windows and lagged features., Engineered features (rolling volatility, quarticity, etc.) and designed time-respecting train/test splits to prevent data leakage., Evaluated models out-of-sample and compared against naive baselines, highlighting limits and robustness issues.
• Virtual Scroll Access System (Scrum project), Java, GitHub, Jenkins, JUnit, 01/01/23, Worked in a five-person Scrum team to build a role-based file repository (auth, admin, upload/download, search + stats)., Owned user management, search, and login features; wrote unit tests to keep >75% coverage in CI., Ran sprint planning, daily stand-ups, and client demos; used GitHub + Jenkins CI for automated builds and test execution each sprint.

• University of Sydney Waste Fighters Society, President/Ex-Treasurer, 01/01/23, 12/31/25, Sydney, Developed and managed budgets, tracked expenses, and ensured transparency and accuracy in financial records., Doubled member base to 400+ through cross-society collaborations, creative marketing, and adaptability to unforeseen circumstances., Fostered seamless collaboration and communication with members and external partners, e.g. book & clothes swap with 2 other societies., Secured USYD's 'Festival of Creativity' sustainability grant and delivered a slow fashion event in partnership with the university's sustainability team.
• Sydney Manga & Anime Show (SMASH!), Community Support - Ushering, Production - Stages, 01/01/23, 12/31/24
• Oxfam Trailwalker, Checkpoint Crew & Trail Marshal, 01/01/23, 12/31/23
• The Habitat, 01/01/18, 12/31/18
• Sailing, IYT Gold Level