Senior Software Engineer

Join Mastercard as a Senior Software Engineer on site in O'Fallon, Missouri. This experienced individual contributor designs, builds, tests, and maintains complex software solutions while serving as a technical leader and mentor within the team. The role offers high autonomy, involvement across the full software development lifecycle, and a focus on elevating code quality and system design.

Responsibilities

• Own software delivery tasks (code development, test, deployment, release, configuration and documentation) at an application/software component level
• Troubleshoot and refactor existing code to achieve exceptional code quality
• Adopt new languages and architecture patterns required for the work
• Participate in and contribute to the team’s agile process and decisions, including prioritization
• Pull from backlog and deliver work with guidance from experienced team members and in partnership with the full scrum team
• Automate build, operate, and run aspects of software
• Drive code and design trade-off discussions within the team when needed
• Drive integration of services with a focus on customer journey and experience
• Perform demos and acceptance discussions in interactions with Product Owners
• Understand operational and engineering experience and actively work to improve metrics in the ownership area
• Develop a complete understanding of end-to-end technical architecture and dependency systems
• Promote adoption of technology standards and opinionated frameworks, and review coding, test, and automation work of team members
• Mentor and guide new and less-experienced team members
• Identify opportunities to improve processes and reduce waste
• Share and seek knowledge within the Guild/Program to drive reuse of patterns, libraries, and practices

Requirements

• Working experience across multiple programming languages (JAVA is a must) and frameworks
• High-energy, detail-oriented, proactive, and able to function independently under pressure
• Passion for continuous learning and challenging opportunities
• Strong verbal and written communication skills, with relationship-building, collaboration, and organizational capabilities
• Drives outcomes through a strong commitment to timely delivery of key objectives
• Solid decision-making skills and a continual improvement mindset
• Experience with software development processes and one or more Application Lifecycle Management tools
• Track record of delivering high-quality project design deliverables and documentation
• Demonstrated experience with AI
• Familiarity with performance tuning and automation
• Bachelor’s degree in Computer Science (or extensive equivalent experience)

Technologies

• Java

Benefits

• Insurance (including medical, prescription drug, dental, vision, disability, life insurance)
• Flexible spending account and health savings account
• Paid leaves (including 16 weeks of new parent leave and up to 20 days of bereavement leave)
• 80 hours of Paid Sick and Safe Time
• 25 days of vacation time and 5 personal days, pro-rated based on date of hire
• 10 annual paid U.S. observed holidays
• 401k with a best-in-class company match
• Deferred compensation for eligible roles
• Fitness reimbursement or on-site fitness facilities
• Eligibility for tuition reimbursement
• 56 hours of Paid Sick and Safe Time
• Jury duty leave
• On-site fitness facilities in some locations

Corporate Security Responsibility

• Abide by Mastercard’s security policies and practices
• Ensure the confidentiality and integrity of the information being accessed
• Report any suspected information security violation or breach
• Complete all periodic mandatory security trainings in accordance with Mastercard’s guidelines

Pay Ranges

O'Fallon, Missouri: USD 115,000 - USD 184,000 per year