Lead Site Reliability Engineer: Automation & Scale

Mastercard; Leixlip; On-site; EUR 120,000 - 150,000; Full time

Job summary

Mastercard Business Operations is seeking a Lead Site Reliability Engineer to ensure reliability, scalability, and performance of mission-critical applications powering Mastercard’s global payments ecosystem.

The role emphasizes automation, proactive monitoring, and a culture of blameless learning, with mentorship of junior engineers and collaboration with product teams to deliver resilient services. Ireland-based role with strong engineering discipline and collaboration.

Qualifications

• Observability: implement metrics, logs, traces to support incident detection and continuous service improvement.
• Programming and Scripting: write and maintain code to automate tasks using Python, Go, Bash.
• Systems and Network Administration: manage Linux/Unix systems and network components.
• Cloud Computing and Infrastructure: design, deploy, and manage apps on cloud platforms.
• Reliability and Scalability: build highly available, fault-tolerant systems.
• DevOps Practices: apply CI/CD, containers, and orchestration for reliable delivery.
• Troubleshooting: diagnose and resolve complex system issues.
• Capacity Planning and Performance Optimization: forecast needs and optimize performance.
• IT Service Management: incident, change management aligned to business needs.
• Proactive Monitoring and Improvement (SRE Applications): use signals to prevent problems.

Responsibilities

• Be a developing subject matter expert in the Site Reliability Engineering area, influencing stakeholders and applying advanced knowledge to drive achievement of area goals and initiatives by contributing to solution development and improvements for existing products, services, and/or processes.
• Implement and maintain high-availability system solutions, ensuring stability, performance, and operational continuity.
• Evaluate operational requirements to develop effective technical solutions within existing frameworks.
• Lead automation and scripting efforts to streamline operational processes and incident response workflows.
• Troubleshoot and resolve complex system issues, escalating as necessary to maintain system health and proactively address risks.
• Contribute to documentation, knowledge sharing, and best practices to improve team operational procedures.
• Conduct reviews and quality assurance activities to uphold organizational standards for system stability.
• Keep current with industry trends and emerging technologies relevant to system reliability and operational automation.
• Guide and mentor junior team members through on-the-job experiences, reviewing work and fostering a culture of continuous improvement to grow expertise around their discipline.

Skills

Observability

Programming

Sys Admin

Cloud

Reliability

DevOps

Troubleshooting

Capacity Planning

IT Service Mgmt

Monitoring & Improvement

Job description

Mastercard Business Operations is seeking a Lead Site Reliability Engineer to ensure reliability, scalability, and performance of mission-critical applications powering Mastercard’s global payments ecosystem.

The role emphasizes automation, proactive monitoring, and a culture of blameless learning, with mentorship of junior engineers and collaboration with product teams to deliver resilient services. Ireland-based role with strong engineering discipline and collaboration.