Senior Software Engineer

Mastercard

O Fallon, Missouri, United States of America Posted October 27, 2026

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On-site Full-time Senior
Job Description

We are seeking a Senior Software Engineer to join Mastercard’s Transaction Switching program, focusing on improving authorization response time. You will collaborate with development teams to test and optimize performance, leveraging your expertise in C/C++ and Linux environments. Ideal candidates have experience in performance engineering and a passion for solving complex technical challenges.

Required Skills
software development collaboration C++ Linux
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