• Leveraging Kafka and Protobuf to build a pipeline that captures delivery data changes and sync it from application to data lake seamlessly

• Designed and built a decorator library to allow client service to simply wrap the object within decorator to have full access and control to billing data without worry about N+1 query

• Built the data model level cache that single object change only impact one object serialization cache instead of the whole request cache in JSON API serialization layer to improve 20% of overall server API latency and 30% for data intensive endpoints

• Led the team to build a billing report service which improved the performance of monthly statement data for single restaurant from more than 1 minute to less than 1 second

• Migrated company all billing and pricing data from monolith to dedicated billing services

• Implemented API Gate services for data warehouse and ported over 30% of monolith HTTPS traffics

• Created fraud dashboard and integrated with fraud detect service to auto block of fraud accounts to reduce fraud activities ratio from 1% to 0.15%.

• Internationalized membership service to support app use in different countries and currencies

• Created test cases for new features among all 5 iOS/Android mobile apps, react web app and backend

• Performed regression tests by constituting UI automation test (E2E) on iOS and web clients to check product

functionality in various devices and old version apps

• Built CI system in circle CI which automatically ran regression tests and generated test result reports

• Developed integration test suits on Postman, and documented the entire endpoints with test cases and examples

• Planned test schedules and strategies in accordance with project scopes or delivery dates