Provide advanced product-level technical support for PayWay and act as the escalation point for complex incidents that cannot be resolved by L1/L2. The L3 Engineer is expected to have strong knowledge of the PayWay architecture, transaction processing logic, application components, interfaces, database structure, and software code.

• Take ownership of incidents escalated by L1/L2.
• Perform deep technical and functional analysis of complex production incidents.
• Analyze PayWay source code where required.
• Debug applications and reproduce defects.
• Analyze transaction flows across the different PayWay modules.
• Investigate performance, concurrency, database, interface, and transaction-processing problems.
• Identify software defects and define appropriate corrections.
• Develop and deliver corrective patches where applicable.
• Perform code reviews and technical validation of fixes.
• Support deployment of critical corrections in production.
• Conduct root-cause analysis for major incidents.
• Produce Root Cause Analysis (RCA) reports and preventive recommendations.
• Work closely with R&D and product teams when incidents require product evolution.
• Support L1/L2 teams through technical guidance and knowledge transfer.
• Contribute to the continuous improvement of troubleshooting procedures and technical documentation.

• Strong Java/J2EE development skills.
• Spring and enterprise Java technologies.
• Oracle Database and advanced SQL/PLSQL knowledge.
• Tomcat.
• Linux/Unix environments.
• REST/SOAP APIs and system integration.
• TCP/IP and network troubleshooting.
• Software debugging and performance analysis.
• Strong understanding of transactional systems.
• ISO 8583 payment messaging.
• Knowledge of card issuing, acquiring, ATM, POS, payment switching, fraud management, reconciliation, and settlement concepts.
• Knowledge of cryptography and HSM concepts is a strong advantage.

• Bachelor's or Engineering degree in IT, Computer Science, Software Engineering, Networks, or equivalent.
• 5+ years of experience, preferably in payment systems or mission-critical transactional platforms.
• Strong Java development background.

• Advanced problem-solving skills.
• Ability to troubleshoot complex cross-system incidents.
• Strong software engineering fundamentals.
• Ability to work on critical production incidents.
• Strong documentation and Root Cause Analysis capabilities.
• Ability to mentor L1/L2 engineers.
• Strong English communication skills.