Senior Payment Systems Engineer

Avenga is an international engineering firm helping businesses operate with AI at the core. With 6,000+ experts worldwide, we combine engineering expertise with AI-native thinking to turn ambitious ideas into real-world impact across industries, technologies, and markets. At the core of the role In Buenos Aires (CABA) within the Banking & Financial Services industry, we are actively seeking a Senior Mainframe Developer (COBOL) to strengthen our banking technology team. Your primary responsibility will involve developing, maintaining, and enhancing mission-critical mainframe applications supporting core banking products and payment ecosystems. You will contribute to high-impact initiatives across accounts, deposits, cards, and payment services, ensuring reliable and scalable solutions that support business operations and customer transactions. This position is hybrid and requires on-site work 3 times a week in CABA. Core skills you’ll bring Proven experience as a Senior Mainframe Developer within the banking or financial services industry. Strong hands-on experience with COBOL development in both Batch and Online environments. Solid knowledge of DB2, CICS, JCL, and IBM Mainframe technologies. Experience working with TSO/ISPF and SQL. Strong understanding of core banking systems and transaction processing. Functional knowledge of accounts, savings accounts, checking accounts, and time deposit products. Experience supporting payment services and banking transaction platforms. Nice-to-have Experience with card processing systems and payment ecosystems. Knowledge of merchant payments, acquiring, and processor integrations. Experience with credit card and debit card platforms. Understanding of chargeback and merchant settlement processes. Previous experience working in large-scale banking transformation initiatives. The impact you'll create Develop, maintain, and enhance COBOL-based applications supporting core banking operations. Design and implement solutions for accounts, savings, checking accounts, and time deposit products. Support the development and maintenance of payment services and transaction processing systems. Contribute to card-related platforms, including credit and debit card solutions. Analyze business requirements and translate them into reliable mainframe solutions. Collaborate with functional and technical stakeholders to support banking modernization initiatives. Perform application maintenance, troubleshooting, testing, and performance optimization. Ensure the stability, integrity, and availability of critical banking applications. People are at the core of Avenga. We provide equal opportunities regardless of race, ethnicity, gender identity, sexual orientation, disability, age, religion, or any other characteristic. We are committed to a respectful environment where everyone can be themselves, share their ideas, and feel that they belong.