RoofStacks

Backend Engineer

• 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 OAuth2, OpenID Connect, JWT/JWS, and 3DS SDK/ACS

Senior Backend Developer, Card Payment Systems

Business Analyst

• Managing card application journeys across all channels (Branch, IVR, Digital)
• Integrations with KKB/LKS, Decision Support, Analytics Solutions and other decisioning tools
• Oversight of card lifecycle operations: new issuance, renewal, closure, limits, fraud
• Supporting fee & commission configurations, statement management, posting, rediscount
• Handling BIN/RANGE, EMV scripting, PIN management, encryption/key management
• Managing POS onboarding, device vendors, parameter distributions, RKL flows
• Driving interchange & clearing processes (Visa Base II, Mastercard IPM, BKM YTH/BTH)
• Working on 3DS 2.x, ACS, GO authentication systems, API integrations, and open banking
• Ensuring regulatory compliance (BDDK, PCI-DSS, KVKK) and adapting to scheme updates

Senior Backend Developer, Card Payment Systems

Business Analyst, Card Payment Systems