Senior Mainframe Engineer & Tech Lead

Mastercard Inc.; København; On-site; DKK 900,000 - 1,200,000; Full time

Job summary

Mastercard Inc. is seeking a Lead Mainframe Engineer to design, develop, and maintain high-performance mainframe solutions that power critical payment platforms.

You will lead a team, shape architecture, and drive modernization initiatives while ensuring reliability, security, and operational excellence. This hands-on leadership role requires deep knowledge of z/OS and core mainframe technologies, with a focus on delivering scalable, secure systems and mentoring engineers to achieve delivery

Qualifications

• Strong experience designing, developing, and maintaining enterprise mainframe applications.
• Proven ability to lead engineering teams and influence architecture decisions.
• Solid understanding of mainframe technologies, performance, and security.

Responsibilities

• Design, develop, and maintain enterprise-grade mainframe applications and services that support mission-critical business processes.
• Lead technical design and architecture discussions for complex mainframe solutions and integrations.
• Support the full software lifecycle, including analysis, design, development, testing, deployment, and production support.
• Develop and maintain solutions using COBOL, JCL, CICS, IMS, DB2, MQ, and related mainframe technologies.
• Take ownership of end-to-end delivery, from requirements through implementation and ongoing operation.
• Troubleshoot and resolve production issues while ensuring high availability, performance, and operational stability.
• Collaborate with distributed systems, platform, infrastructure, product, and business teams to deliver integrated solutions.
• Improve automation, monitoring, resilience, performance, and operational efficiency across the mainframe environment.
• Ensure compliance with security, audit, and regulatory requirements.

Skills

Mainframe leadership

COBOL

CICS

JCL

DB2

IMS

MQ

z/OS

Distributed collaboration

Tools

TSO

MQ

DB2 tooling

CICS tooling

Job description

Mastercard Inc. is seeking a Lead Mainframe Engineer to design, develop, and maintain high-performance mainframe solutions that power critical payment platforms.

You will lead a team, shape architecture, and drive modernization initiatives while ensuring reliability, security, and operational excellence. This hands-on leadership role requires deep knowledge of z/OS and core mainframe technologies, with a focus on delivering scalable, secure systems and mentoring engineers to achieve delivery