Senior Site Reliability Engineer

• Are you a detail -oriented individual who enjoys complex problem solving?
• Do you love determining the correct actions required to fix a problem?
• Do you have a low tolerance for manual work and look to automate everything you can?
The Site Reliability Engineer (SRE) will be responsible for ensuring the reliability, scalability, and performance of IT infrastructure supporting VMware virtualization and Oracle Linux environments. This role combines operational excellence with automation and engineering practices to reduce toil, improve system resilience, and deliver a seamless experience for internal and external customers.

Key Responsibilities
Infrastructure Reliability & Performance
• Monitor, maintain, and optimize VMware clusters, ESXi hosts, and Oracle Linux servers
• Ensure high availability and disaster recovery readiness for virtualized environments
• Troubleshoot and resolve incidents impacting virtualization and Linux platforms

Automation & Tooling
• Design and implement automation for patching, configuration management, and routine operational tasks using tools like Chef, Ansible, Jenkins, and Python
• Develop scripts and pipelines to reduce manual effort and improve operational agility

Capacity & Configuration Management
• Manage resource allocation across VMware clusters and Oracle Linux systems
• Implement standardization and compliance for OS configurations and security baselines

Monitoring & Alerting
• Configure and maintain monitoring solutions (e.g., vROps, Splunk, Prometheus) for proactive issue detection
• Optimize alerting thresholds to reduce noise and improve incident response times

Incident & Problem Management
• Lead root cause analysis for critical incidents and implement permanent fixes
• Collaborate with cross-functional teams to resolve complex infrastructure issues

Security & Compliance
• Ensure timely patching of VMware and Oracle Linux environments to address vulnerabilities
• Maintain compliance with enterprise security standards and regulatory requirements

All About You and Required Skills & Qualifications
• BS degree in Computer Science or related technical field involving coding (e.g., physics or mathematics), or equivalent practical experience
• Bachelor's degree in information technology, Computer Science or equivalent work experience
• Analytical/problem solving and planning skills
• The ability to organize, multi-task and prioritize work based on current business needs.
• Possess strong communication skills -- both verbal and written
• Strong relationship skills, collaborative skills and customer service skills
• Interest in designing, analysing and troubleshooting large-scale distributed systems
• We need team members with an appetite for change and pushing the boundaries of what can be done with automation. Experience in working across development, operations, and Engineering teams to prioritize needs and to build relationships is a must
• We support many different stakeholders. Experience in dealing with difficult situations and making decisions with a sense of urgency is needed
• Ability to work with little or no supervision
• Strong experience with VMware vSphere, ESXi, vCenter, and related virtualization technologies.
• Proficiency in Oracle Linux administration, including kernel tuning and patching.
• Hands-on experience with automation tools (Chef, Ansible, Jenkins) and scripting (Python, Bash).
• Familiarity with monitoring and logging tools (vROps, Splunk, Prometheus).
• Knowledge of networking fundamentals, storage (VSAN), and virtualization best practices.
• Experience with incident management, root cause analysis, and performance optimization.
• Understanding of cloud platforms (AWS, Azure) and container technologies (Docker, Kubernetes) is a plus.

Preferred Qualifications
• Certifications: VMware Certified Professional (VCP), Oracle Linux Certified Administrator
• Experience in Site Reliability Engineering principles (SLIs, SLOs, error budgets)
• Strong collaboration and communication skills for cross-team engagement

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

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.