● Design and develop the out-of-stock email campaign system to send users email that have out-of-stock products in cart/wishlist. Result in approximately 80% email impressions and 6.8% click rate ● Design and develop scheduling jobs monitoring the key metrics of entire marketplace groups’ A/B tests and generating reports allows data scientists and businesses to review and evaluate the performance. ● Refactor and enhance the checkout code structure and logging metrics of checkout and payment endpoint which facilitate the development and reduce debugging efforts.

● Design and develop applications using Java, Spring Boot and RESTful architecture. ● Develop event-handling service in python as a state machine deployed as an AWS Lambda. Implementation including event authorization, duplicate events handling, data lookup, data evaluation and validation, caching, rate limiting and throttling. ● Write end-to-end tests to ensure the system has satisfied the business requirement and met the acceptance criteria. Testing environment including shell scripting, containers’ configuration and tuning properties files. ● Unit tests and integration tests for testing code functionality and modules’ integration. ● Deploy and maintain AWS resources including S3, RDS, Kinesis, SQS, Lambda and Cloudwatch, etc in Cloudformation templates

● Design and develop end-to-end ETL job in DataStage to consume flat data to stage tables including business data lookup validation, exception handling, email notification, data’s consistency and verification. ● Integrate Java into ETL processing for user defined application data processing. ● SQL scripting in Oracle SQL developer for source data extraction and loaded data verification