Senior SRE: Performance & Scalability Engineer

Mastercard; O’Fallon (MO); On-site; USD 96,000 - 163,000; Full time

Benefits offered by this job

Medical

Dental

Vision

Disability insurance

Life insurance

Savings plans

Paid leave

Holidays

Vacation

Fitness support

Tuition reimbursement

Job summary

Mastercard is seeking a Senior Site Reliability Engineer, Performance Engineering, in Missouri to optimize ABU services and lead automated testing efforts. You will partner with SRE and performance teams to tune, scale, and secure high‑throughput, low‑latency financial applications, and guide incident response improvements.

The role emphasizes automation, AI‑assisted script generation, and data‑driven performance analysis across stakeholders across geographies, with a strong focus on reliability

Qualifications

• Bachelor's degree in CS or related discipline or equivalent hands‑on experience.
• Advanced knowledge of web applications and distributed systems infrastructure.
• Strong verbal and written communication for technical and non‑technical audiences.
• Experience in performance bottleneck analysis and designing systems for scale.
• Experience with JVM internals and garbage collection tuning.
• Experience with database, OS, storage internals or performance scaling.
• Experience building automated performance regression test suites for low‑latency, high‑throughput financial apps.
• Experience identifying bottlenecks across app, DB, cache, data stores, networks, queues, and streaming.
• Experience end‑to‑end issue evaluation from edge components to DBs.
• Experience working with internal stakeholders providing performance leadership.
• Knowledge of AI‑assisted development and analysis methods.

Responsibilities

• Partner with site reliability and performance engineers to test and tune ABU services via automated test suites and capacity planning.
• Build, manage, and maintain robust performance testing suites.
• Measure availability, latency, throughput, and overall system health; communicate results clearly.
• Scale systems through automation and propose reliability improvements.
• Review production incidents; drive changes to reduce recurrence.
• Manage project priorities, deadlines, and deliverables independently.
• Apply automation‑first mindset to repetitive tasks.
• Use AI‑assisted tools to accelerate script generation, test data prep, log analysis, and anomaly detection.
• Apply data‑driven analysis and observability to identify trends and bottlenecks; recommend improvements.
• Coach and mentor technical talent with deep technical expertise.

Skills

Bachelor's degree or equivalent hands‑

Web apps & distributed systems

Communication skills

Performance bottleneck analysis

JVM internals & GC tuning

AI-assisted development

Automation & scripting

Education

Bachelor's degree in CS / related field

Tools

Bitbucket

Maven

Jenkins

Gatling

BlazeMeter

Job description

Mastercard is seeking a Senior Site Reliability Engineer, Performance Engineering, in Missouri to optimize ABU services and lead automated testing efforts. You will partner with SRE and performance teams to tune, scale, and secure high‑throughput, low‑latency financial applications, and guide incident response improvements.

The role emphasizes automation, AI‑assisted script generation, and data‑driven performance analysis across stakeholders across geographies, with a strong focus on reliability