• Increased the speed of users' content delivery by over 10% by developing multi CDN management platform and CDN speed analysis algorithm, which allowed Enterprise customers to switch transparently to the fastest CDN provider.

• Improved the visualization speed and processing accuracy of 500 GB of daily raw log data generated by multiple CDN providers by developing MapReduce jobs for Hadoop in Java.

• Extended the security of the customers’ video streaming and enabled customers to restrict video streaming by zone, IP, time range and number of plays by developing Wowza security plug-in.

• Delivered the best user experience on the multi CDN portal by developing notification services using RabbitMQ for both message queue and STOMP broker for WebSocket servers.

• Enhanced management of user files by developing online file manager on top of AWS S3 storage with a feature that enabled auto-purging of old files from edge servers of multiple CDN provider.

Technologies used: Java, Spring, REST, Hadoop, MySQL, JavaScript, HTML, CSS, Bootstrap, jQuery, RabbitMQ, D3.js, Socket.js, AWS S3, AWS CloudFront, MaxCDN, JUnit, Mochito, TDD, Agile, Tomcat, Git, Jenkins

• Reduced the cost of database solution and support by 60% by developing MySQL database architecture, migrating old Oracle database to new MySQL one, and coding multi-threaded migration application in Java and JDBC.

• Boosted sales of ETN (Exchange Traded Notes) products by 70% by developing a web application with easy to compare feature and real time price analytics of ETN products from Korea Exchange.

Technologies used: Java, JSP, REST, JavaScript, JUnit, Mockito, TDD, Agile, MySQL, Oracle, jQuery, jQuery, HTML, CSS, WebLogic, Git, Jenkins