Charlie H. Email & Phone Number

Toronto, ON, CA

• SDE@Amazon Ads. Projects highlight:1 - Personalized Shopping Video and Live Stream ContentLed the design and implementation of a pivotal backend service, a milestone project for Amazon Ads 2022. This service.
• Designed the system structure to achieve customized product recommendations, leading to revenue growth per user by more than 20% in 2022.
• Managed high-traffic loads, successfully supporting up to 30k+ transactions per second (TPS) while maintaining a P99 latency of less than 100ms.
• Optimized request-sending strategies on the mobile end to better handle real-time changes, resulting in a 20%+ reduction in peak loads during specific periods, maintaining efficient service response times.
• Achieved a remarkable 40%+ increase in monthly active users in the United States market.2 - Alexa Integration for Amazon FireTV DevicesLed a milestone project on the 2023 roadmap of Amazon Ads, integrating Alexa Voice.
• Designed a brand-new service structure integrating Alexa Voice Assistant on Amazon FireTV devices.

London, ON, CA

Armonk, New York, NY, US

• Compiler Developer for IBM Compiler Team. Mainly working on optimizations for IBM Compiler and LLVM
• Led the implementation of Dead Code Removal by integrating cycle-detecting algorithms, resulting in a 12% reduction of inactive compilation symbols, thereby raising the performance of the IBM PL/I compiler.
• Contributed to the design of key code-generation optimizations for IBM Mainframe architectures, as part of IBM’s commercial compiler set serves over 1.2 million users globally.