AARON TAYLOR HAMMER

Senior Full Stack Software Engineer

• Pitched and created the initial fullstack architecture for the Block Checkout Platform which was created to unify all checkouts that total $35 billion in yearly GPV spanning 8 teams across Cash App and Square.
• Architectured the frontend engineering designs and led a small team of 3 to implement Order with Google and Google Business Profile syncing for all Square and Cash App sellers in React and Typescript.
• Led a team of 6 engineers for a rapid prototyping to prove out Square's agentic commerce capabilities.
• With a team of 2 other engineers we quickly brought Square's ecommerce checkouts in EAA's accessibility compliance

Full Stack Software Engineer II

• Led several projects and owned the frontend for Square Payment Links on a 9-person team using Golang, PHP, Typescript, and Vue that managed over $4+ billion in processing volume, growing 62% YoY for 2024.
• Rebuilt Square Payment Link's tipping feature to let over 1 million sellers customize tip percentages, support their local currencies, and to provide more localized tipping percentages as defaults.
• Drove our code red for reliability, created and owned our observability documentation and stack in Datadog, and wrote up and led a 90-day plan to get all our SLOs from failing to 99.995% at the end of our initiative.
• Led the migration of our Payment Links' services from on-prem to AWS infrastructure using Terraform.
• Created the buyer-side frontend for Square's restaurant QR code checkout experience, visited restaurants during to offer help, and unlocked over $70 million in processing volume for Square Payment Links' MoM.

Full Stack Software Engineer II

• Contributed with an 8-person Scrum team to a React frontend and Scala microservice backend for the UHC healthcare client dashboard landing page that's accessed by over 50+ million customers worldwide.
• Led and rapidly implemented the frontend requirements for a SSO redirect on myUHC to enable over 26 million customers to receive free COVID-19 tests by week's end to comply with federal mandates.
• Drove a performance initiative to improve UX. I reduced our max bundle from 1.62MBs to 495KBs and slashed FCP by 0.4 seconds through lazy-loading, bundle-splitting and concurrent rendering.
• Contributed with a dedicated team to migrate the client dashboard, myUHC, from AngularJS to ReactJS

Full Stack Software Developer

• Modeled and created the AWS infrastructure for a scalable serverless image caching API that returns images in a specified size and image format while caching alternative formats. Image transfer size dropped 50%+.

• Viral application that lets users pick their living preferences with 1m+ unique visits and 12m+ votes.

Bachelor of Science in Computer Science