Kei Oka

Developing ChalkLab, an English lesson material generator, and Orca, a Chrome extension and iOS app for English practice with an AI tutor. Built web apps, Chrome extensions, and an iOS app, and conducted user interviews with English learners worldwide.

Developed a web-based application for DSPs to manage client information, including progress tracking, scheduling, and goal setting. Implemented new functionalities using React, Golang, and Node.js, and initiated end-to-end testing with Cypress.

Developed a web app for insurance agents to submit customer information and receive quotes using React, GraphQL, Apollo Client, Node.js, and Golang. Reduced HTTP requests by approximately 40% by enabling Apollo Client batch requests, and wrote unit and E2E tests.

Developed a check-in web app for a fitness club using React.js and Redux, including responsive design for TV and tablet. Reduced API calls by 30% using debouncing and improved UX with a retry mechanism for failed check-in requests.

Developed a messaging single-page web app for college students using React.js, Redux, SASS, and WebSocket. Redesigned the client-side architecture, implemented real-time updates, and added unit tests with Jest and Enzyme.

Developed a real-time dashboard using React.js, Redux, Firebase, and a Ruby on Rails API. Rapidly prototyped new capabilities and collaborated with team members to plan and develop robust solutions.

Designed, developed, and maintained CMS-based websites using WordPress, HTML, and CSS. Designed and prototyped a new application and collaborated with the business development team to ensure alignment.

Bachelor's degree in International Business from Ritsumeikan University, completed in 2014.

Completed the Deep Learning Specialization, issued in January 2025.

Completed the Machine Learning Specialization, issued in September 2024.