• Heavily used Amazon Web Services, such as AWS Lambda, API gateway, S3, RDS and

DynamoDB 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 to

documented 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 information

systems 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 and

behavioral 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 using

Protractor, 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.