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

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

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

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