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Senior Software Engineer; Mainframe

Job in O'Fallon, St. Charles County, Missouri, 63366, USA
Listing for: MasterCard
Full Time position
Listed on 2026-02-16
Job specializations:
  • Software Development
    Software Engineer, Senior Developer
Salary/Wage Range or Industry Benchmark: 125000 - 150000 USD Yearly USD 125000.00 150000.00 YEAR
Job Description & How to Apply Below
Position: Senior Software Engineer (Mainframe)
** Our Purpose
*** 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.
*** Title and Summary**### Senior Software Engineer (Mainframe)### Who is Mastercard  Mastercard is a global technology company in the payments industry. We work to connect and power an inclusive, digital economy that benefits everyone, everywhere by making transactions safe, simple, smart and accessible.
Our mission is to connect and power an inclusive, digital economy that benefits everyone, everywhere by making transactions safe, simple, smart, and accessible. Using secure data and networks, partnerships and passion, our innovations and solutions help individuals, financial institutions, governments, and businesses realize their greatest potential.
Job Overview:

• Software development engineering in the Mastercard code application is a dedicated team of software developers leading the development transformation and working to facilitate best Dev Ops practices across Master Card’s technology organization.

• Requires hands-on experience in industry-standard developer tools, design, development, test, implement and support the solutions throughout the software development cycle     Role  
• Plan, design and develop technical solutions and alternatives to meet business requirements in adherence with Master Card standards, processes and best practices.

• Lead day-to-day system development and maintenance activities of the team to meet service level agreements (SLAs) and create solutions with a high level of innovation, cost effectiveness, high quality and faster time to market.  
• Accountable for full systems development life cycle including creating high quality requirements documents, use-cases, design and other technical artifacts including but not limited to detailed test strategy/test design, performance benchmarking, release rollout and deployment plans, contingency/back-out plans, feasibility study, cost and time analysis and detailed estimates.

• Perform system maintenance, production incident problem management, identification of root cause, remediation of the problems and on-call pager support schedule. Select appropriate technical frameworks and solution delivery methodology.

• Adapt to the technical artifact templates per the needs of the project and technology. Contribute ideas to help ensure that required standards and processes are in place. Maintain solution and technology road maps.

• Research and evaluate current and upcoming technologies and frameworks.

• Participate in PoCs (Proof of Concept) and help the Department with selection of Vendor Solutions, Technologies, Methodologies and Frameworks.

• Collaborate with Vendor Resources for Support of Products.

• Follow and promote Quality Assurance and Quality Control processes in the department. Actively look for opportunities to enhance standards and improve process efficiency. Mentor and guide other team members during all phases of the SDLC. Ensure adequate test coverage in Unit Testing, System Testing/Integration  
• Testing and Performance Testing. Perform Quality Inspections and Walkthroughs throughout the SDLC including Requirements Review, Design Review, Code Review and Security Review to ensure compliance with Master Card standards.
All about You  
• IT experience in all phases of the development lifecycle   
• Proficient development Knowledge in C# .NET , Quality Engineering Tools (Must)  
• Exposure in technologies in mainframe such as JCL, DB2, COBOL, File-Aid-DB2, STROBE , XPEDITER , ENDEVOR , OPC scheduler , TWS scheduler to support various testing of application running in Mainframe (preferred)  
• High-energy, detail-oriented, proactive and have the ability to function under pressure in an independent environment (Must)  
•…
Position Requirements
10+ Years work experience
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