• Developed and maintained internal tools as a full stack engineer for Human Resources division using JavaScript (React JS, Relay, Redux), PHP (Hack, GraphQL), HTML5/CSS3

• Developed shared components using React / Relay / PHP / GraphQL for People Products org

• Lead projects as a tech lead working with a few Software Engineers, Product Manager and Product Designers

• Working in an on-call shift and handled issues that user were facing

• Developed and maintained Ads interfaces / reporting systems for Facebook Advertisers using JavaScript (React JS, Flux), PHP (Hack, GraphAPI), HTML/CSS

• Developed and maintained API endpoint for Advertisers using PHP (Hack) and GraphAPI

• Developed and maintained internal data visualization framework written in React JS

• Accomplished multiple feature developments and cooperated with Product Manager / Designer

• Working in an on-call shift, and handled high severity problems

• Developing and maintaining MICE, which is a web system for faculties, staffs, and students using PHP, Python, JavaScript, HTML/CSS, and MYSQL.

# Implemented mobile ads experiments. The aim of these experiments was to reduce response time and improve user experience.

• Designed, implemented and tested the implementation using JavaScript and internal frameworks.

• This resulted in a dramatically reduced response time and improved user experience.

# Improved the internal web tool for the Ads & Commerce team.

• Implemented and tested search functionality using Google Web Toolkit (GWT), Java, HTML/CSS, and RPC (Protocol buffers).

• Implemented and tested internal testing framework for mobile devices using GWT, Java, HTML/CSS, RPC (Protocol buffers), and Bigtable (internal NoSQL database).