RYAN ZERNACH

Full-Stack AI Systems Engineer

Ryan_Zernach_2025_Senior_AI_Systems_Engineer_Remote_United_States

đź’ł Cost Plus Processing

My first close look at payments taught me how much infrastructure hides behind a card swipe. Before money settles, a transaction passes through merchant systems, gateways, processors, networks, and risk controls—and each handoff can affect the merchant’s outcome. Cost Plus Processing • Sept 2012 - Jan 2013

đź’ł Cost Plus Processing

Summary

I studied merchant processing systems and payment gateways by following the full card-transaction lifecycle. The goal was not to memorize a payment diagram; it was to see where routing, interchange, and risk change the merchant’s outcome.

Team

Tech Stack

Timeline

Contributions

Learning the Card Payment Stack

Electronic card payments are a relay, not a single event. This role gave me a systems-level view of the handoffs between merchants, gateways, processors, and networks—and the decisions that shape the result.

Transaction Lifecycles

How a payment moves from initiation to financial outcome

Merchant Systems + Gateways

Understanding how payment data flows through operational systems

Core Knowledge Built

Foundational payments concepts that stayed useful