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Senior Software Engineer
Mastercard
O'Fallon, MissouriPosted Aug 27, 2026 · 2h ago$115k – $184k
Full-time$115k – $184kSeniorOn-siteFintech
About this role
Mastercard is seeking a Senior Software Development Engineer to design, develop, and support highly scalable distributed systems. This role involves technical leadership, mentorship, and end-to-end ownership of critical software components. You will contribute to architectural decisions, lead development efforts, and ensure the performance, scalability, and security of applications.
What we are looking for
6- Design and develop highly scalable distributed systems
- Contribute to software architecture and design decisions
- Lead development of modular, extensible, high-performance applications
- Implement automated testing strategies and quality engineering practices
- Mentor junior developers and lead code reviews
- Troubleshoot and resolve complex production issues
