ACI Worldwide's threat model is transaction fraud at industrial scale. The company processes hundreds of billions of electronic payments annually across 94+ countries, operating the software infrastructure that banks, merchants, and billers rely on to move money. The attack surface spans real-time payments, card processing, and cross-border orchestration - domains where a single vulnerability can cascade into nine-figure losses or regulatory action in multiple jurisdictions simultaneously.
Founded in 1975 and headquartered in Omaha, Nebraska, ACI builds payments platforms including ACI Connetic, the Payments Orchestration Platform, and ACI Speedpay. Security work here means defending systems that handle the plumbing of global commerce: fraud detection pipelines, payment authorization flows, and the APIs connecting financial institutions across banking, retail, utilities, and merchant services verticals. The tooling runs at the intersection of legacy payment protocols and modern real-time rails, which is exactly where exploit complexity lives.
A team of nearly 4,000 operates across the company's global footprint. The engineering challenge isn't theoretical - ACI's infrastructure touches the actual money movement layer, not adjacent analytics or reporting. That means security roles involve securing systems with direct financial exposure, working alongside payments engineers who understand the transaction lifecycle from authorization through settlement. The stakes are legible: uptime and integrity aren't nice-to-haves when you're processing at this volume.
