# Senior Site Reliability Engineer, Performance Engineering

Hiring organization: [Mastercard](https://career.thegoodapps.co/organizations/mastercard)

Canonical page: https://career.thegoodapps.co/jobs/f431d315-2d76-403a-82a8-4ba135d29209

Listed on Mastercard's own careers site. Applications go to them directly.

- Employment type: full time
- Seniority: Senior
- Location: O Fallon, MO
- Salary: 96000 – 163000 USD per year

## Summary

A Senior Site Reliability Engineer focused on performance testing and optimization for Mastercard's payment systems, particularly the Automatic Billing Updater service. The role suits engineers with deep expertise in distributed systems, performance bottleneck analysis, and automation who want to apply that knowledge to high-scale financial infrastructure.

_Our summary, not Mastercard's wording._

## Skills named

Apache Maven, Bitbucket, Gatling, Java, Jenkins, LoadRunner, Performance Testing, Python, Scala

## Required

- Advanced knowledge of web applications and distributed systems infrastructure
- Excellent verbal and written communication skills
- Experience with performance bottleneck analysis and system design for scale
- Experience with Java Virtual Machine internals and garbage collection tuning
- Experience with database internals, server or operating system internals, storage system internals, or performance scaling for related platforms
- Experience implementing automated performance regression test suites for low-latency, high-throughput financial applications
- Experience analyzing performance bottlenecks across application code, databases, cache layers, data stores, servers, networks, messaging queues, and streaming platforms
- Experience analyzing issues holistically across edge components, application tiers, and databases
- Experience working directly with internal customers to resolve issues and provide performance engineering leadership
- Working knowledge of AI-assisted development and analysis techniques including prompt-driven script generation and root cause analysis support

## Nice to have

- Bachelor's degree in Computer Science, Computer Systems, Information Technology, or related field
- Experience with Java, Python, Scala, or other programming and scripting languages
- Experience with Bitbucket, Maven, Jenkins, Gatling, and BlazeMeter
- Experience migrating legacy on-premises testing suites to cloud-native stacks
- Experience migrating performance testing suites from LoadRunner to Gatling or BlazeMeter
- Strong software performance analysis, bottleneck identification, scaling, and automation experience
- Experience using AI-enabled tools or large language models to generate, refactor, explain, or optimize performance testing scripts
- Experience applying AI-assisted analysis to performance metrics, logs, traces, dashboards, and incident data
- Familiarity with responsible AI practices including validation of AI-generated outputs and protection of sensitive data

Apply on Mastercard's site: https://mastercard.wd1.myworkdayjobs.com/en-US/CorporateCareers/job/OFallon-Missouri/Senior-Site-Reliability-Engineer--Performance-Engineering_R-286332