Senior Software Engineer - Java Full Stack & AI

Senior Software Engineer role on Mastercard’s Decision Services Technology team, focused on complex full-stack delivery and AI-powered transaction analysis.

Responsibilities

• Design, develop, test, deploy, and support complex software solutions
• Build scalable APIs, backend services, and modern web applications
• Use Java, Spring Boot, React or Angular, and Python across the stack
• Lead implementation for AI-enabled capabilities and automation initiatives
• Drive technical solutions from requirements through deployment
• Contribute to architecture decisions and participate in system design discussions
• Apply architectural patterns that improve scalability, reliability, and maintainability
• Guide implementation across distributed and cloud-based systems
• Support integration of AI and machine learning capabilities into business products
• Champion testing, secure coding, and code quality standards
• Perform code reviews and mentor engineers with technical feedback
• Lead troubleshooting and root-cause analysis for complex issues
• Improve observability, automation, performance, and operational readiness
• Drive continuous improvement across the engineering lifecycle
• Partner with Product, Architecture, and Engineering leadership
• Influence technical direction and engineering best practices
• Contribute to Agile planning, estimation, and delivery leadership

Requirements

• Bachelor’s degree in Computer Science, Engineering, Information Technology, or a related field, or equivalent experience
• 6+ years developing enterprise software solutions
• Advanced proficiency in Java 8+ and Spring Boot
• Deep understanding of REST APIs, microservices, and distributed systems
• Strong knowledge of React, Angular, or comparable frontend frameworks
• Expertise in Oracle or SQL-based database development
• Familiarity with CI/CD practices and modern engineering workflows
• Knowledge of Python for AI, automation, and data-driven applications
• Exposure to GitHub Copilot or similar AI-assisted development tools
• Strong troubleshooting, debugging, and analytical capabilities
• Ability to independently deliver complex technical solutions with minimal oversight

Preferred Qualifications

• Experience with AWS, Azure, or GCP
• Knowledge of Docker, Kubernetes, and cloud-native architectures
• Exposure to Databricks, Spark, Delta Lake, or similar technologies
• Experience integrating AI/ML services, APIs, or models into enterprise platforms
• Experience mentoring engineers and leading technical initiatives
• Background in payments, fraud, analytics, or data-driven business solutions

Technologies

• Java, Spring Boot, React, Angular
• Python
• REST APIs, microservices
• Oracle, SQL-based databases
• CI/CD, GitHub Copilot
• AWS, Azure, GCP
• Docker, Kubernetes
• Databricks, Spark, Delta Lake

Overview

The Decision Services Technology team within Mastercard’s Business & Market Insights organization builds analytics, reporting, and intelligence solutions to help customers investigate transactions, identify fraud patterns, and make informed business decisions.

Success Measures

• Independently deliver complex features and technical initiatives
• Demonstrate ownership of key systems, services, or technical domains
• Mentor team members and elevate engineering quality
• Contribute to AI-powered product innovation and platform growth
• Improve scalability, reliability, performance, and operational excellence
• Influence engineering standards and technical direction across the team

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

Compensation

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

Benefits

• Competitive base salary
• Annual bonus or commissions (depending on the role)
• Insurance including medical, prescription drug, dental, vision, disability, and 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
• Intern benefits: 56 hours of Paid Sick and Safe Time, jury duty leave, and on-site fitness facilities in some locations

Location

• O’Fallon, MO (onsite)