Senior Mainframe Engineer

This is us

At Avenga, we believe that human creativity empowers technology that matters. Operating globally, our 6000+ specialists provide a full spectrum of services, including business and tech advisory, enterprise solutions, CX, UX and Ul design, managed services, product development, and software development.

This is the job

In Buenos Aires (CABA) In the Banking & Financial Services industry, we are actively seeking a Senior Payment Systems Specialist to join our Cards engineering area. In this role, you will be responsible for designing, developing, and optimizing mission-critical mainframe applications that power core card processing, merchant acquiring, settlement, and payment gateway architectures.

This position is hybrid and requires on-site work 3 times a week in CABA.


This is you

• Solid professional experience as a Mainframe Developer or Payment Systems Specialist in enterprise banking environment.

• Deep technical expertise in COBOL, DB2, CICS, and JCL within an IBM Mainframe ecosystem.

• Strong functional knowledge of the acquiring domain, including Merchant Payments, Aggregator Banks, and payment processors.

• Comprehensive understanding of Credit Card and Debit Card lifecycle processing, merchant settlement, and chargeback handling.

• Proven track record delivering software developments for card platforms and payment processing systems.

• Strong problem-solving abilities and attention to detail when working with high-volume, transactional mainframe applications.

Nice-to-have skills:

• Experience with card brand integrations (Visa, Mastercard, or local processing networks).

• Knowledge of payment security standards, PCI-DSS compliance, and fraud management workflows.

This is your role

• Design, code, test, and maintain high-volume COBOL, CICS, DB2, and JCL programs supporting core card systems.

• Develop features and adaptations for the target Cards domain, ensuring optimal execution on IBM Mainframe platforms.

• Implement business logic for merchant acquiring, payment aggregation, transaction settlement, and chargeback processing.

• Analyze database performance (DB2) and optimize batch and online transactional workflows.

• Collaborate with functional analysts and technical teams to translate acquiring and processing requirements into robust code.

• Troubleshoot production incidents, perform root-cause analysis, and maintain system documentation.

At Avenga, everyone matters. We provide equal opportunities in recruitment, career development, and leadership, regardless of race, ethnicity, gender identity, sexual orientation, disability, age, religion, or any other characteristic. We are committed to fostering a work environment where our diverse community of employees, candidates, and business partners actively shapes our growth. By bringing together people from different backgrounds and experiences, we build a workplace where everyone feels free to be themselves while honoring the boundaries of others.