Senior Software Engineer

MasterCard; København; On-site; DKK 900,000 - 1,200,000; Full time

Job summary

Mastercard is hiring a Senior Software Engineer for Mainframe Development in Copenhagen. You will design, develop, and maintain COBOL/JCL/DB2-based applications on IBM z/OS, collaborating with global teams to modernize services and enable APIs while ensuring security standards are met.

The role requires 5+ years in mainframe development, strong z/OS knowledge, and experience with integration layers; you’ll participate in on-call duties and contribute to modernization efforts across platforms.

Qualifications

• 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.

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

Agile methodologies

Cross-time zone collaboration

System modernization

Tools

COBOL

JCL

DB2

SQL

z/OS

Job description

Title and Summary

Senior Software Engineer Job Posting Title Senior Software Engineer - Mainframe Development

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.

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.

Marketing

Everyone wants easier ways to pay; we invent them. Checkout lines are slow; we speed them along. Merchants want more sales; we give them data and insights. People need financial access; we connect them. Corporate purchasing is complicated; we make it simple. Commuters are busy; we speed them on their way. Governments need greater efficiencies; we help create them. Small businesses are virtual; we give them access to a world of buyers. Retailers want to fight fraud; we provide the tools.