Created 2 poker games with 70 thousand users per day. Earned 50 more performance scores in Lighthouse by improving FCP, decreasing CLS, and minimizing requests. Dealt with message synchronization issues involving polling, WebSocket, and client-side calculation. Introduced Rive to prevent the distortion of animations between designers and programmers. Hold a workshop to share tips about web performance with 20 programmers. Assigned tasks to juniors and reviewed codes.

Created front-end pages that interact with both server-side and blockchain by one person. Reviewed founder's unmatured codes without further conflicts.

Refactored a wallet module used in 4 websites and 12 environments. Mentored 2 newcomers from boot camps.