• Working with multiple third party aggregator (Mobile payment gateway) for integrating payment for mobile users in many countries (UK, SG, EG, KW, TH, MY,...) and operators (Vodafone, Orange, Mobinil, …). [PHP, Ruby, Javascript] • Reduced time to market in new countries for Mobiclix from 1 month to 2 weeks by rebuilding payment integration infrastructure using Golang. [Go] • Reduced CPU load on server and also reduce logic errors of the payment process by investigating and fix several serious bugs in whole payment process. • Make marketing, payment process smoother and more accurate by figure out bottleneck of third party tracking tool and apply temporary solution for that. • Build and design prototype for a high quality video platform both back-end and front-end, which served as a launchpad for future products [Rails, React with Redux] • Research a variety of analytic tracking tools to measure and improve marketing strategies of existing and future products. • Create many tools for supporting the marketing team and designer team to make marketing integration process smoother and faster. • Add feature and tracking information to help the data analyst create reports more easy. • Handle deploy and maintaining many web servers for many countries in Digital Ocean and Google Cloud.

• Designed and build backend of CMS system for the medical service client to solve problems about the lack of functionality and difficult to use of their current EDC (Electronic Data Capture) tool. The result is customer satisfied and change project from short-term project to long-term project. [Rails, Angularjs] • Designed and build a gateway service to a third party SOAP server for adding enchantment functionality like custom authorize, caching, merge functions [Sinatra] • Designed and build backend for a mobile app about social photo sharing. [Rails] • Handle deploy and maintaining many web servers of another project of company in Amazon EC2. • Coached and on-board new members to increase their productivity and shorten training time

• Improved software system part of the MRI machine performance over 30% with originals by migrating core critical component from C++ 98 to C++ 11. • Apply test and debugged several critical components using logging, unit test and system level testing for ensuring the migration was correct.