- Heavily used Amazon Web Services, such as AWS Lambda, API gateway, S3, RDS andDynamoDB etc. to build serverless web applications.- Implemented the highly scalable asynchronous services using Lambda, SQS and Kinesis etc.- Utilized the React, Redux and Bootstrap to develop the frontend UI in a user-friendly fashion.- Refactored the legacy codebase to a better structured and manageable project. The refactoring includes creating microservices, integrating Kibana with logs, accelerating the deployment frequency by CI/CD tools, such as Jenkins and Terraform, and automatically running different types of tests using unittest, Jest and loki as part of the build process.- Worked closely with other technical teams, discussed the trade-offs of the integration between two systems and finalized the best solution to complete the task timely.- Extracted and processed the data from multiple data source using Python, SQL and Mixpanel to analyze the product performance to reach the KPIs.- Effectively collaborated with Product and Design team as part of Journey team to perform product discovery, user testing, prototyping and design/implementing final solutions.- Mentored junior software engineers on software development best practices.- Cooperated with offshore team smoothly in the early morning or late night to achieve objects.

- Developed and extended the back-end logic using Groovy on Grails framework according todocumented software requirements.- Designed database based on the E-R diagram. Indicates the properties and relations. Normalized relations to eliminate data redundancy.- Optimized data visualization of the web application through server-side pagination and database refactoring. The data presentation speed is increased by 320%.- Implemented the front-end use cases with Angular.js, Redux and Webpack.- Introduced the testing tools including Spock, Jasmine, Karma and Protractor to run unit tests,integration tests for both front-end and back-end functionalities to improve system robustness.- Set up server environment including firewall, network ports and installed the informationsystems to the Linux server.- Utilized Jenkins, Gitlab CI and Docker to achieve software continuous delivery.- Cooperated with the business analyst and utilized UML to do functional, structural andbehavioral modeling for the new information system design.- Provided clients support regarding technical questions and helped them to address issues.- Wrote documentations and release notes for the projects using the Confluence wiki.

- Improved and debugged the single page web application’s functionalities with JavaScript,Angular.js and Node.js.- Created end-to-end automation test cases and unit test cases for the web application usingProtractor, Jasmine.js, Selenium and Karma.- Automated the process of concatenating, minifying and cleaning project’s files using Grunt.- Validated and manipulated data from firebase web service.

- Analyzed customer requirement to design elegant website wireframe, and optimized website layout by using JavaScript, HTML, CSS.- Deployed a Wordpress CMS website on Internet web server.- Utilized PHP and JavaScript to customize Wordpress map plugin and embedded it into the website.- Developed a webpage to manage map plugin in a visual way instead of in a coding way.

- Took charge of web widgets development, and designed widgets UI.- Developed back-end service of widgets by using .NET MVC framework. Connected database, which is in - Microsoft Azure, and selected specific information shown for widgets.- Optimized widgets UI and animation using jQuery and Bootstrap framework.- Assistant in converting Company website to the new version which mainly uses Angular.js.- Used Protractor and Karma to do automation test and unit test for Angular.js.Analyzed customer requirements for developing mobile application.

- Conducted a postcard delivery activity for advertising ASUS Company among hangzhou universities which more than 1,000 students and teachers attended.- Introduced customers computer devices and assisted them to choose appropriate products.- Did market researches on computer selling, and composed analysis sheets for the company.