Focusing on early database design, optimization and monitoring on Amazon RDS.

Creating a pipeline in Python with Pandas for scarping and processing data to support business on EC2.

Migrated the interfaces of app end from Yii1 to Yii2, compressed 50% of the original code, enhanced security and consistency of Android and iOS end, increased 40% of development efficiency.

Conducted concurrent test under apache-AB, optimized database, established index and cache under MySQL and Memcached, doubled throughput keeping latency constant.

Replaced the generation of important caches (e.g., resource on the homepage) from visiting the page to the regular generation on the server.

Designed algorithms (e.g., content-based recommendation) to implement event recommendation.

Reconstructed message system, reduced response time by 30%.

Built PHP Interfaces with RESTful APIs for real-name authentication, user hierarchy system etc.

Established gym management system, completed 30% of front-end code (Vue.js) and 70% of APIs (PHP in Yaf framework, based on RESTful API), and documented & tested APIs.