A server engineer on Banking, Cash App Cards team

A server engineer on Banking, Cash App Cards team

Led the end-to-end delivery of customer-facing features on Cash App Card, including:

• GPS location consent trigger (60%+ opt-in during high-risk auth and card activation)

• Customer-initiated card merchant blocking interface (5%+ improvement in transaction decline precision)

• Revamped Cash App Card transaction receipts (in-app and email) with much richer transaction context to customers

Drove operational rigor through writing card transaction testing, covering 10+ patterns (auth,

capture, refund, etc), which can be used to safely validate code changes against staging before rollout to production.

SWE on Infrastructure, Reliability team

• Developed the traffic-based canary deployment system against production services to reduce the percentage of bad code release incidents

• Conducted load tests for Coinbase Web and QR Code to prepare for the 2022 Super Bowl Ad and collaborated with the Retail team to identify and remove performance bottlenecks

• Implemented and maintained the incident management tool (in-house application made with Slack bot) to support team/service-wide paging and re-shape the response process for major incidents

• Implemented Slack commands to auto-generate the incident timeline and follow-ups by crawling the history of the Slack messages reacted by designated emojis, using Ruby as a language and Slack API

• Improved developer productivity by facilitating the write-up of postmortem documents

• Created an integrated serverless API that sends and verifies e-mail/SNS/ARS authentication

• Deployed the API service into AWS API Gateway, S3, and SQS/SNS

• Built in JavaScript with Node.js and Express.js as web frameworks