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# Senior Software Engineer

- **Company:** Mastercard
- **Location:** O'Fallon, MO, United States
- **Experience:** Expert
- **Salary:** $115,000.0 - $184,000.0
- **Contract:** Permanent contract
- **Skills:** Agile Methodology, C++ (Programming Language), Software Debugging, Linux, Perl (Programming Language), Python (Programming Language), Linux System Administration, Shell Script, Tcl (Programming Language), Performance Testing, Backend, Low Latency, Splunk, Dynatrace
- **Published:** July 16, 2026
- **Apply:** https://www.juju.com/job/00000000ggvkct

## About the Role

* Do you have a passion for solving complex technical challenges?

 * Do you love learning new technologies and apply it to your team?

 * Have you developed software before - preferably in C/C++?

 * Have you spent time in Linux environments?

 * Have you created scripts to automate manual tasks (i.e. shell script, TCL, Perl, Python)?

 * Do you understand throughput, latency, memory and CPU utilization?

 * Do you have experience and prefer working in an Agile environment?, * Proven experience developing backend applications in a Linux environment with C and/or C++ programming language(s)

 * Deep knowledge and experience of computer architecture with throughput, latency, memory and CPU utilization for performance engineering to test, debug and troubleshoot performance issues.

 * Clear experience with automation to create scripts for manual tasks (I.e., shell scripting, TCL, Perl, Python)

## Description

_Mastercard powers economies and empowers people in 200+ countries and territories worldwide. Together with our customers, we're helping build a sustainable economy where everyone can prosper. We support a wide range of digital payments choices, making transactions secure, simple, smart and accessible. Our technology and innovation, partnerships and networks combine to deliver a unique set of products and services that help people, businesses and governments realize their greatest potential._, This is an exciting opportunity for you to join Mastercard's Transaction Switching program and improve authorization response time. Authorization sends billions of transactions among the integrated issuers, acquirers, and service providers worldwide. This position is on the performance engineering team in O'Fallon, Missouri and will partner with the development teams to performance test and tune each release. We are looking for software engineers that are passionate about creating high quality software while keeping performance top of mind., * Work closely with feature teams to identify risks and anticipate problems to ensure that each release does not negatively impact performance

 * Dig into the code to determine performance bottlenecks and make the improvement

 * Design, configure, automate, and execute performance tests

 * Improve the performance environment with your own code, automation, and onboarding of external tools (i.e. Dynatrace and Splunk)


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