Babycoin: cryptocurrency trading simulator

• Collaborated with a team of eight to integrate various components into a cohesive and user-friendly site, utilizing modern Agile practices and Git workflows for efficient development

• Implemented a real-time ticker tape and graph feature, using React and Tailwind CSS to provide an intuitive and responsive interface for tracking coin movements and making informed trading decisions

• Retrieved data via RESTful API in real-time and stored it with PostgreSQL and Node.js for efficient data management and retrieval

System design of an e-commerce website

• Redesigned an outdated monolithic backend to a micro-service architecture for independent scaling

• Designed MongoDB schemas and optimized queries with aggregation pipeline. Performed ETL process to migrate over 20 million product records into database

• Identified system bottlenecks and performed stress-testing with loader.io, K6, and New Relic to assist with optimization decisions

• Decreased latency by 99% at 4000 RPS with <10ms response time and <0.1% error rate by horizontally scaling the microservice (three EC2 instances and NGINX load balancer) and NGINX caching

Atelier: Redesign of the eCommerce website

• Created and designed the Question and Answer widget with React and CSS to modernize legacy website

• Developed backend service with RESTful API and deployed on AWS EC2

• Analyzed performance with Google Lighthouse and Google Page Speed. Improved performance and accessibility scores from 46 to 99 points

• Wrote tests with React Testing Library and measure code coverage with Jest to ensure components render correctly

• Provided basics of computer, mobile phone, and tablet tutoring to seniors in person and remotely

• Developed the training curriculum designed for use in classes

• Offered one-on-one help to solve their technology and media problem

• Hosted and planned event celebrations with nearly 160 participants remotely

• Provide computer training and tutoring basics to Cantonese, Mandarin, and English-speaking students in person and remotely.

• Develop computer instructional materials useful for students.

• Provide one-on-one help with using Cellphone, Tablets, and Computer

• Assist the director with planning events and project