Mainframe Developer

Senior Mainframe Developer – COBOL, DB2, VSAM, JCL, CICS

Job Details

• Location: Buenos Aires, Argentina
• Work Arrangement: Hybrid – 2 Days Onsite
• Employment type:- Contract (Hourly Based) 40 Hours a week
• Experience: 10 Years
• Additional Platform: ACI BASE24 / BASE24-eps
• Domain: Banking / Payment Processing

Top Required Skills

• Mainframe COBOL
• DB2
• VSAM
• JCL (Job Control Language)
• Mainframe CICS
• ACI BASE24 / BASE24-eps
• Payment Switching
• ATM / POS Processing
• ISO 8583 Messaging
• Card Payment Processing
• Mainframe / HP NonStop Systems
• Transaction Routing
• Production Support
• Incident Management
• Performance Tuning

Role Summary

The Senior Technical Specialist will provide technical expertise in Mainframe COBOL, DB2, VSAM, JCL, and CICS, ensuring the stability, security, and efficiency of mainframe applications. The role also involves developing and maintaining payment processing applications using the ACI BASE24 platform for ATM, POS, and card transaction systems.

Key Responsibilities

• Develop, maintain, and enhance COBOL programs and mainframe applications.
• Perform database design, development, and optimization using DB2.
• Manage VSAM datasets to ensure performance and data integrity.
• Create, modify, and debug JCL scripts for batch processing.
• Support CICS transactions and applications.
• Design, develop, and customize ACI BASE24 modules, transaction flows, interfaces, and message formats.
• Work with ISO 8583 messaging standards, card networks, switch integrations, and electronic payment systems.
• Analyze business and functional requirements and translate them into technical solutions.
• Troubleshoot technical issues, production incidents, and transaction processing defects.
• Conduct root cause analysis and implement corrective solutions.
• Execute unit, system, and integration testing, and support user acceptance testing.
• Support deployments, system upgrades, release management, and environment migrations.
• Monitor transaction performance and improve system stability, availability, and throughput.
• Collaborate with business analysts, payment operations, vendors, and application support teams.
• Maintain technical documentation and participate in code reviews.
• Perform mainframe performance tuning and capacity planning.

Required Experience & Skills

• 10 years of relevant experience.
• Strong proficiency in Mainframe COBOL programming.
• Working knowledge of DB2 database design, development, and administration.
• Experience managing VSAM datasets.
• Hands-on experience with JCL scripting and batch processing.
• Hands-on expertise in Mainframe CICS.
• Experience with ACI BASE24 / BASE24-eps and payment processing applications.
• Knowledge of ATM/POS processing, ISO 8583, card payments, and payment switching.
• Familiarity with Mainframe / HP NonStop systems and transaction routing.
• Strong analytical, troubleshooting, and problem-solving skills.
• Excellent communication and teamwork abilities.

Preferred Skills / Certifications

• Relevant certifications in Mainframe technologies.