Senior Software Engineer

Mastercard Payment Services Denmark A/S; København; On-site; DKK 900,000 - 1,200,000; Full time

Job summary

Mastercard Payment Services Denmark A/S is seeking a Senior Software Engineer to contribute to the modernization and reliability of core mainframe systems. You will design, develop, and maintain COBOL, JCL, and DB2 applications on IBM z/OS, collaborating with teams across time zones to enable seamless integration with distributed services.

You will lead modernization efforts, drive API enablement, and ensure adherence to security standards while participating in on-call rotations.

Qualifications

• 5+ years of mainframe development experience (IBM z/OS, COBOL, JCL, DB2, SQL).
• Strong understanding of z/OS architecture and batch processing.
• Experience with file transfer gateways and integration layers.
• Familiarity with Agile methodologies.
• Ability to work in a global team and communicate across time zones.
• Passion for modernization and continuous improvement.

Responsibilities

• Design, develop, and maintain COBOL, JCL, and DB2-based applications on IBM z/OS.
• Collaborate with cross-functional teams to integrate mainframe services with distributed systems.
• Lead modernization efforts including migration to event-driven architectures and API enablement.
• Ensure compliance with Mastercard’s Mainframe Security Technical Standard.
• Participate in daily change request syncs and operational reviews.
• Contribute to the Software Engineering Guild’s leveling and performance standards.
• Participate in on-call duties outside working hours.

Skills

Mainframe development

COBOL

JCL

DB2

SQL

z/OS

Agile methodologies

Cross-time-zone comms

Job description

Placering

Ballerup

Our Purpose

Mastercard powers economies and empowers people in 200+ countries and territories worldwide. Together with our customers, we’re helping build a sustainable economy where everyone can prosper. We support a wide range of digital payments choices, making transactions secure, simple, smart and accessible. Our technology and innovation, partnerships and networks combine to deliver a unique set of products and services that help people, businesses and governments realize their greatest potential.

Title and Summary

Senior Software Engineer

Job Posting Title

Senior Software Engineer - Mainframe Development

Who is Mastercard?

We work to connect and power an inclusive, digital economy that benefits everyone, everywhere, by making transactions safe, simple, smart, and accessible. Using secure data and networks, partnerships, and passion, our innovations and solutions help individuals, financial institutions, governments, and businesses realize their greatest potential.

Our Decency Quotient (DQ) drives our culture and everything we do inside and outside of our company. We cultivate a culture of inclusion for all employees that respects their individual strengths, views, and experiences. We believe that our differences enable us to be a better team—one that makes better decisions, drives innovation, and delivers better business results.

Overview

As part of one of the Mainframe Services team, you will contribute to the modernization and operational excellence of Mastercard’s core transaction processing systems. This role is critical to ensuring the reliability, scalability, and security of Betalingsservice, which supports billions of transactions.

Role

As a Senior Software Engineer, you will:

• Design, develop, and maintain COBOL, JCL, and DB2-based applications on IBM z/OS.
• Collaborate with cross-functional teams to integrate mainframe services with distributed systems.
• Lead modernization efforts including migration to event-driven architectures and API enablement.
• Ensure compliance with Mastercard’s Mainframe Security Technical Standard.
• Participate in daily change request syncs and operational reviews.
• Contribute to the Software Engineering Guild’s leveling and performance standards.
• Participate in on-call duties outside working hours.

All About You

You have:

• 5+ years of experience in mainframe development (IBM z/OS, COBOL, JCL, DB2, SQL).
• Strong understanding of z/OS architecture and batch processing.
• Experience with file transfer gateways, and integration layers.
• Familiarity with Agile methodologies.
• Ability to work in a global team and communicate effectively across time zones.
• A passion for modernization and continuous improvement.

Bonus:

Knowledge of Mastercard’s Bill Pay Products.

Corporate Security Responsibility

All activities involving access to Mastercard assets, information, and networks comes with an inherent risk to the organization and, therefore, it is expected that every person working for, or on behalf of, Mastercard is responsible for information security and must:

• Abide by Mastercard’s security policies and practices;
• Ensure the confidentiality and integrity of the information being accessed;
• Report any suspected information security violation or breach, and
• Complete all periodic mandatory security trainings in accordance with Mastercard’s guidelines.