Software Engineer IV, Payment Platform

The company is seeking a hands-on Senior Engineer IV to lead the transaction-processing core of its payment systems platform. The role owns the terminal transport layer, store-and-forward handling, decline and exception fallback logic, and BIN-based routing to ensure reliable card-present payments across a retail network. The engineer works directly with transport and transaction-state code, reproduces terminal-level failures, and manages fixes through to production. The position offers a path to payment architecture ownership, with the first year focused on learning the payment transaction lifecycle and terminal protocols through hands-on defect resolution and root-cause analysis.