Analyze and troubleshoot malfunctions in running applications as part of second-level support. Investigate and handle customer-reported issues, service requests, and inquiries. Escalate and report production-related issues to internal stakeholders in a timely manner. Ensure the availability and stability of 24/7 production environments. Perform installation and deployment of new releases and fixes for payment system applications. Participate in on-call rotations, handling out-of-hours incidents and notifications related to production issues. Support planned maintenance activities on production environments according to the predefined on-call matrix. Bachelor’s degree in Computer Science, Computer Information Systems, or an equivalent discipline. 3–5 years of relevant experience in EFT application support or a similar technical support role. Strong understanding of client/server communication models. Hands-on experience with APIs, web services, and XML. Proficiency in UNIX/Linux operating systems. Solid knowledge of ISO 8583 standards and financial transaction processing. Experience with mobile payment systems. Working knowledge of shell scripting.