Senior Site Reliability Engineer, Performance Engineering

About the role

Mastercard’s Payment Optimization team is looking for a Senior Site Reliability Engineer focused on Performance Engineering. You will work on the Automatic Billing Updater (ABU) service, ensuring it scales reliably and delivers high‑performance transaction processing for issuers, acquirers and merchants worldwide.

Key responsibilities

• Partner with SRE and performance engineers to test, tune and validate ABU services before production release using automated test suites, bottleneck analysis, chaos testing and capacity planning.
• Build, manage and maintain robust performance testing frameworks and scripts.
• Measure and monitor system availability, latency, throughput and overall health, and communicate findings and recommendations.
• Scale systems sustainably through automation and propose improvements to reliability, velocity and performance.
• Investigate production incidents, identify root causes and drive corrective actions to prevent recurrence.
• Own project priorities, deadlines and deliverables independently while mentoring technical talent.

Required profile

• Proven experience in API performance testing, automation and scripting.
• Strong ability to discover bottlenecks, perform performance tuning and analyze performance data.
• Experience with capacity planning, platform resiliency and chaos testing.
• Self‑driven mindset with the ability to manage priorities and mentor peers.

Required skills

• API performance testing
• Automation
• Scripting
• Performance tuning
• Performance data analysis
• Capacity planning
• Chaos testing