Lead Software Engineer — Validation & Resilience (Hybrid)

Mastercard Inc. in O'Fallon, MO is seeking a Lead Software Engineer to design, build, and validate mission-critical, highly available systems that process secure financial transactions at global scale. In this hybrid role, you'll combine hands-on software engineering with quality engineering to define validation strategies across functional behavior, transaction integrity, resiliency, performance, failover, recovery, monitoring, and production readiness.