Developed API of sending an email to client using by mailgun, let customer service is able to receive a request email from clients.

Developed weekly/monthly invoices in PDF format written by NodeJs, stored on S3, allowing clients to download their invoices.

Used Elasticsearch to store dimensions and metrics for ads, used Kibana as a visualization tool.

Integrated user DB to merge the original two into one, used Strapi to visualize users table, migrated old user from Mongo to Postgresql.

Developed the interactive logic of the card game lobby and carousel interface.

Developed a new platform game Sic Bo, independently developed the countdown board, the dice rolling effect and the historical lottery record table, and used Redux and Redux-Saga to control each asynchronous data stream.

Optimized a mobile app with page-based loading using Webpack Loadable, reducing ~20% response time.