Design, build, and operate reliable backend services powering Cash Out transactions across debit card, ACH, FedNow, and RTP networks. Develop APIs and event-driven integrations, ensure idempotency, reconciliation, auditability, observability, and production reliability. Partner with product, design, data, and analytics; use AI-assisted development workflows; participate in on-call and incident response; mentor engineers; and contribute across the stack when needed.