Software Engineer

• May 2022 - May 2023

Senior Backend Engineer II

• Apr 2021 - Aug 2021

Senior Backend Engineer

• Jan 2019 - Mar 2021

- Led re-architecture of search system into scalable approach, spanning year and migrating in stages with zero downtime - Redesigned cache to enhance search results and reduce memory usage by 30% and Elasticsearch CPU usage by 41%- Headed, designed and implemented Instant Balance which shortened money transfer process from days to minutes- Used Redis and RabbitMQ to ensure payout requests complete properly and avoid duplicate payout requests- Managed cross-team communication in clarifying and eliminating dependencies to retire legacy system- Ensured new commits were covered with automated unit tests and increased code coverage from nearly 0% to over 65% Show less

Backend Engineer

• Jun 2017 - Nov 2018

- Devised and built entire backend infrastructure for early-stage startup independently, in collaboration with frontend team - Programmed all services with Flask framework in Python, except for presentation tier service with Play framework in Java - Conceived scalable and reliable architecture for instant messaging and group chat mainly with DynamoDB - Implemented highly fault-tolerant scheduler to update flight info with AWS Lambda, CloudWatch, SQS, and DynamoDB - Utilized RabbitMQ to enable asynchronous communication and clustered RabbitMQ servers to provide better availability - Developed efficient services with single t2.micro instance serving up to ~1k websocket connections - Boosted worker’s consumption running on t2.micro instance by 320% to ~90 msgs/sec by making worker asynchronous - Increased availability and minimized cost by setting up Auto Scaling to DynamoDB and EC2 instances along with ALB - Defined MySQL table schemas and proper indexes and used Redis for caching and simple locking - Configured Jenkins Pipeline to automatically run unit/integration tests and deploy to environments from Github repos - Used AWS SNS applications and topics for mobile push notifications and immediate warning/exception alerts Show less

Backend Engineer

• Sep 2016 - Jun 2017

- Collaborated with team to design, construct, test and launch Huafu’s online payment platform from scratch - Integrated internal systems and Huafu’s payment platform with third-party payment and electronic receipt platform - Implemented payment system using Play framework in Java on AWS EC2 with MySQL and DynamoDB as databases - Utilized AWS Lambda function in Python to asynchronously and periodically send e-receipt info to e-receipt platform - Collaborated with team to design, construct, test and launch Huafu’s online payment platform from scratch - Integrated internal systems and Huafu’s payment platform with third-party payment and electronic receipt platform - Implemented payment system using Play framework in Java on AWS EC2 with MySQL and DynamoDB as databases - Utilized AWS Lambda function in Python to asynchronously and periodically send e-receipt info to e-receipt platform

Substitute Military Service of Education

• Aug 2015 - Sep 2016

mandatory civil duty mandatory civil duty