Senior Card Systems Engineer - Payments & Card Ops

Mercury is seeking a Senior Software Engineer for the Cards Integration team. You will own system design and build features across the stack for Mercury Debit and IO cards, focusing on reliability and customer experience. The role emphasizes ownership, teamwork, and rigorous attention to detail. Ideal candidates will have strong full-stack capabilities, experience with complex architectures, and comfort with Haskell and TypeScript. Fintech/payments familiarity is a plus.