Hybrid Senior Backend Developer, Card Payment Systems

Posted 1 hour ago

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About the role

  • Building innovative financial technologies as a Senior .NET Developer at Roofstacks. Join the growing Card Payment Systems team in developing mission-critical services for card applications.

Responsibilities

  • 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

Requirements

  • Minimum 5+ years of experience in software development
  • Bachelor’s degree in Computer Engineering, Software Engineering, or related field
  • Strong experience in C#, .NET Core / .NET Framework
  • Solid command of SQL / PL-SQL (Oracle preferred)
  • Experience in multi-threaded applications and performance optimization
  • Prior banking or fintech experience is highly preferred
  • Hands-on with RESTful API, Webhook integrations
  • Strong debugging, testing, and system integration skills
  • Good command of English is a plus

Job title

Senior Backend Developer, Card Payment Systems

Job type

Experience level

Senior

Salary

Not specified

Degree requirement

Bachelor's Degree

Location requirements

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