Lead Site Reliability Engineer

Lead Site Reliability Engineer

** About the Role
** The Business Operations team is seeking a highly motivated and experienced Lead Site Reliability Engineer (SRE) to ensure the reliability, scalability, and performance of our applications that power Mastercard’s global operations. You will be a technical leader, mentor, and automation champion, driving the adoption of best practices across development and operations.

• Develop subject‑matter expertise in Site Reliability Engineering, influencing stakeholders and applying advanced knowledge to achieve team goals.
• Implement and maintain high‑availability system solutions, ensuring stability, performance, and operational continuity.
• Evaluate operational requirements and design effective technical solutions within existing frameworks.
• Lead automation and scripting initiatives 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‑practice guides 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 continuous improvement.

• Observability: design and implement solutions to collect, analyze, and visualize metrics, logs, and traces for incident detection and continuous improvement.
• Programming and Scripting: write and maintain code in Python, Go, Bash, or similar to automate tasks and support monitoring, deployment, and incident response.
• Systems and Network Administration: configure, operate, and troubleshoot Linux/Unix systems and network components.
• Cloud Computing and Infrastructure: design, deploy, and manage applications on AWS, Azure, or GCP with a focus on scalability, security, and availability.
• Reliability and Scalability: design and operate systems for high availability, fault tolerance, and disaster recovery while meeting future demand.
• Dev Ops Practices: apply CI/CD pipelines, containerization, and orchestration to accelerate software delivery and operations.
• Troubleshooting: systematically identify, diagnose, and resolve technical issues across systems, applications, and networks.
• Capacity Planning and Performance Optimization: monitor resource utilization, forecast capacity needs, and optimize performance.
• IT Service Management: apply ITSM principles to incident, problem, and change management for reliable service delivery.
• Proactive Monitoring and Improvement (SRE Applications): use application reliability signals to anticipate issues and drive preventative improvements.

Competitive base salary (sample range below) and potential annual bonus or commissions. Full‑time benefits include medical, dental, vision, disability, life insurance, flexible spending and health savings accounts, paid leave (including 16 weeks new parent leave, up to 20 days bereavement leave, 80 hours paid sick and safe time, 25 vacation days, 5 personal days), 10 U.S. observed holidays, 401(k) with company match, deferred compensation for eligible roles, fitness reimbursement or on‑site facilities, and tuition reimbursement.

• Abide by Mastercard’s security policies and practices.
• Ensure confidentiality and integrity of accessed information.
• Report any suspected security violation or breach.
• Complete all mandatory periodic security training per Mastercard guidelines.

O’Fallon, Missouri: $122,000 - $207,000 USD

Mastercard is a merit‑based, inclusive, equal‑opportunity employer that considers applicants without regard to gender, gender identity, sexual orientation, race, ethnicity, disability, or veteran status. Appointment is contingent upon a successful background check.