• Maintaining and evolving a large-scale internal reliability and deployment safety platform.

• Focused on error analytics, production reliability, and release gating systems.

Alexa Q&A Widget

• Developed and launched Alexa’s answer widget on Amazon.com from 0 to 1. Sample link: https://www.amazon.com/s?k=how+to+reset+kindle

• Designed and developed the microservice serving the widget. Scaled the service to handle the full Amazon.com search traffic (QPS in thousands). Performed load testing and tuned the service and its dependencies, e.g. Amazon Elasticsearch Service (AES). Reduce both the cost and latency of AES to half. Handle the service scaling and oncall during peak events.

• Designed and developed a full-text search solution for the widget using Elasticsearch, keeping high precision while increasing the coverage.

• Performed comprehensive business opportunity analysis for the widget. Expanded the widget to multiple product categories.

• Designed and developed the data ingestion pipeline for the Q&A corpus powering the widget.

• Optimized Spark jobs in data analysis pipeline using various techniques. Reduce the execution time of the pipeline to half.

• Developed a UI canary for end-to-end testing using Amazon CloudWatch Synthetics.

Alexa Product Answer Notification

• Developed and launched answer notifications for product questions on Alexa.

• Expanded the service into multiple international regions.

• Designed and developed an infrastructure-as-code solution to integrate dashboards, monitors, alarms. It allows easy configuration of multiple dimensions such as region, severity, metric type, etc., for 10+ dependent services via a uniform interface.

• Developed a new Point-of-Sale system in RESTful microservices using React, Spring and PostgreSQL in a startup environment.

• Maintained the existing Ruby on Rails system, migrated its features to the new service.

• Configured and deployed to AWS, closely monitoring production status during oncall.

• Performed sharding on PostgreSQL to boost query performance.

• Developed the E-commerce (EC) solution in company’s Enterprise Resource Planning (ERP) suite, which enables customers to build, customize and manage their own EC website, e.g. Panasonic website https://ec-club.panasonic.jp

• Managed and led a team of 7 engineers to build microservices for the next-generation EC product. Designed and implemented high performing back-end services using Spring and Cassandra, as well as front-end UI with rich features and thoroughly considered UX.

• Led the team to maintain the Content Management System (CMS) in the existing monolith product which has around 5GB code base, supervised on architecture and design.

• Revamped the UI/UX of CMS using Angular Material and CodeMirror, which improved usability and productivity. The project received the company's Golden Reel Award.

• Designed and developed a referral marketing system, which gamified the refer-a-friend process on E-commerce sites to attract consumers and boost online sales.