Involved in the development of the Scenic programming language. Proposed a new syntax for describing requirements using linear temporal logic and implemented the prototype. Also wrote a new parser and compiler that constructs the language's abstract syntax tree and compiles it to executable Python AST.

Contributed to the open-source project Popper: a container-native task engine, as part of the Open-Source Research Experience Program. Added a new feature that allows developers to convert Popper's workflow definitions to other formats. Presented at CROSS Research Symposium 2021 (Video).

Worked for Hot Pepper Beauty Cosme: a user-generated cosmetics review website. Improved server response time by 200ms by optimizing React's server-side rendering process; accomplished a better user experience and reduced the use of server resources. Blog Post (Japanese).

Led the frontend development of atena - digital mailbox where users can browse postal mails online. Was responsible for the redesign of user console and architected the web application using React, Next.js, styled-components, Storybook, Jest, SWR, etc.

Participated in the development of Docpedia: Q&A website for medical professionals. Created specifications, designed APIs and implemented the back-end and front-end for users' profile screen. Blog Post (Japanese).

Added new features to Mercari: the most popular C2C e-commerce app in Japan with 10M+ monthly active users. Used modern technologies such as TypeScript, React, Jest, and Storybook to write maintainable code. Analyzed user-events through BigQuery and Kibana and made data-driven decisions.