Led server-side development with organization-wide impact for Apple apps, including News, Stocks, Weather

• Designed, developed and maintained high-throughput, low-latency, and high availability, large-scale services to run A/B experiments and generate customized configurations for app users

• Led discussion with product managers, cross-engineering teams, data scientists and other partners to gather requirements and translate them into technical specifications

• Identified opportunities and led the entire development lifecycle end-to-end

• Optimized service performance by investigating and addressing performance bottleneck, resulting in a 40% throughput increase and a 50% latency reduction

• Conducted code reviews, mentored junior developers, and maintained high standard of coding best practice

Led the development and maintenance of Spark-based data analysis jobs, guaranteeing both high performance and data reliability

• Collaborated with data scientists and implemented Spark jobs to process large-scale datasets

• Optimized Spark jobs to enhance performance, minimize resource utilization, and reduce processing time

Worked on a large-scale web service that runs online machine learning models in the risk fraud detection team.

• Designed and implemented large-scale high concurrent platform to catch fraud real time.

• Proposed and designed new types of variables using asynchronous events, which reduced variable calculation time and improved service performance by 25%.

• Investigated transaction datasets, proposed, and implemented a Spark-based tool to identify data issues at an early stage and expedite variable delivery. This solution received recognition with an innovation award.

Worked on certification projects for new product launch and platform migration.

• Developed an offline tool using Java and Pig to compare shadow traffic with production traffic, resulting in a significant acceleration of launch and migration processes.

Worked on Global Credit Expansion project in Risk team

• Created Credit Fraud Analytics Service from scratch in Java

• Implemented unit test cases by using PowerMock framework, achieved 100% code coverage

Worked as a full-stack software engineer on server-side and android client-side for application, Raved.