Sam Guyette

Software Engineer • Cash App (Block)

P2P Payments

Worked on backend systems for peer-to-peer payments. Implemented a cross-service payment claiming flow allowing recipients without Cash App accounts to securely claim funds, coordinating workflows across multiple services using event-driven architecture.

Software Engineer • System1

Syndication

Built infrastructure for automated advertising campaigns across multiple ad networks. Developed systems that generate GenAI creatives and convert them into network-specific campaign payloads for platforms such as Google Ads and MediaGo.

Software Development Engineer • Amazon

Payment Risk Engineering

Worked on a payment fraud prevention system used company-wide to reduce bad debt. Led Discover payment network integration into Amazon’s chargeback process. Designed monitoring tools for Amazon Go and Whole Foods, and led Prime Day prep for a tier-one microservice.

Software Engineer • Amount

Partner Implementation Team

Built point-of-sale financing solutions for major financial institutions including Capital One, Guaranteed Rate, and Barclays. Implemented risk assessment modules for digital identity, income verification, and employment checks.

Software Engineer • Scientifix

Built and optimized tools leveraging Google Maps API to extract geographic data, identify potential clients (schools, hospitals, laboratories), and generate leads for the sales team.

Software Engineer Intern • Epson

Designed and implemented automated market monitoring tools that scraped third-party resellers to ensure compliance with company policies and pricing standards.