Derek Li Email & Phone Number

Burlingame, California, United States

• Reduced app latency by up to 30% by implementing a Redux caching strategy to replace redundant, heavy API calls.• Designed and implemented a performance monitoring system providing insight on app performance and areas for improvement using Firebase.• Configured A/B tests and implemented feature experiments helping grow user retention rates to 10k+ daily recurring users.• Managed app release cycles, including QA and issue delegation responsibilities, leading to 10+ consecutive weekly releases.

• Built a data annotation tool enabling the processing of tens of thousands of images per week to train machine learning models using React and Ruby on Rails.• Added dozens of platform interface features providing clients with flexibility and transparency when managing machine learning model generation.• Reduced code regressions and bugs filed by 10% through introducing and configuring Cypress testing suite into the continuous integration pipeline.• Researched and prototyped different video decoding libraries (including JSMpeg and ffmpeg) for precise frame extraction, decreasing data outliers and errors by 15% when training ML models.• Designed a JSON schema for validating data annotation input types for different ML model types including classification and segmentation.

• Merged 10+ pull requests to the Mozilla’s open source dev tool repository.• Implemented the Debugger’s WhyPaused React component, a feature providing users with information on why the Debugger is paused.• Refactored the Debugger’s footer and context menu components for smoother rendering and less visual noise.