Senior Backend Developer (Card Payment Systems)

Job description

At Roofstacks , we’re building innovative financial technologies that power seamless card experiences. We are now looking for a Senior .NET Developer to join our growing Card Payment Systems team. If you're passionate about banking, payments, and high-performance backend development—this opportunity is for you.: 🧩 What You’ll Be Doing: - You will take part in the full development lifecycle of our card platform, working on mission-critical services used in: - Card application flows for Debit, Credit, Prepaid, Digital & Commercial cards - Integrations with KKB/LKS , Decision Support, Analytics Solutions and onboarding systems- Development of card lifecycle and transaction management services (issuance, renewal, limits, fraud, posting, fee, campaign, extre, DWH etc.)- Secure integrations with payment schemes ( Visa, Mastercard, BKM, CUP, Discover ) and EMV scripting/PIN management - POS ecosystem integrations ( TechPOS, Ingenico SDK , CAT transaction flows, parameter distributions)- Real-time and batch transaction processing with high availability (99.9% uptime) requirements- Working with ISO 8583 messaging, socket programming, TCP/IP protocols- Supporting authentication flows via OAu...