# Software Engineer II at Mastercard

Mastercard is hiring a Software Engineer II. Level rates it Little AI ●○○○; you can [apply on Level](https://jobsbylevel.com/go/fe0e2a23-8e38-4768-80c6-0cf854a9475a?utm_medium=ai-agent).

AI Level 1, AI centrality 35 out of 100. O'Fallon, Missouri.

## Details

- Company: [Mastercard](https://jobsbylevel.com/companies/mastercard)
- AI level: AI Level 1 (score 35 out of 100)
- Location: O'Fallon, Missouri
- Posted: October 13, 2026
- Apply: https://jobsbylevel.com/go/fe0e2a23-8e38-4768-80c6-0cf854a9475a?utm_medium=ai-agent

## Description

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 Software Engineer II Overview Mastercard’s Fraud Products team develops capabilities for the Decision Management Platform, which supports solutions designed to combat fraud and validate cardholder identity. This Java-based platform processes billions of transactions each month using a distributed, message-oriented architecture built for high performance and availability. As a Software Engineer II, you will develop, test, deploy, and support applications and services within this platform. You will independently apply core software engineering skills in routine and moderately complex situations, partnering with technical leads and other team members when addressing unfamiliar or highly complex challenges. What You’ll Do Software Development •Design, build, test, deploy, and maintain Java-based applications and services. •Translate business and technical requirements into maintainable software solutions. •Apply data structures and programming concepts to support efficient system performance. •Integrate vendor and open-source technologies into existing systems. •Contribute to Agile discovery, planning, development, and delivery activities. Design & Architecture •Develop software designs that address functional, performance, security, and operational requirements. •Apply established architectural patterns and standards when building distributed applications. •Partner with technical leads to understand system interactions, dependencies, and design decisions. •Support high-performance, highly available transaction-processing solutions. Quality & Secure Engineering •Create and maintain unit, functional, and integration tests. •Apply secure coding practices throughout the software development lifecycle. •Participate in code reviews to improve readability, maintainability, and adherence to engineering standards. •Identify and resolve defects before they affect production systems. Performance & Operational Excellence •Analyze and optimize application performance, scalability, and reliability. •Troubleshoot technical issues and support the resolution of production incidents and problem tickets. •Contribute to monitoring, observability, alerting, and operational readiness. •Develop an understanding of application runtime behavior, dependencies, infrastructure, and support requirements. Collaboration •Partner with engineers, technical leads, Product, Architecture, and other cross-functional teams. •Communicate effectively within a globally distributed environment. •Share technical knowledge and contribute to continuous improvement. •Demonstrate ownership, initiative, and accountability for assigned work. Required Qualifications •Bachelor’s degree in Computer Science, Engineering, Information Technology, Information Systems, or a related field, or equivalent practical experience. •Software development experience using Core Java, including multithreading. •Knowledge of Java/J2EE, Spring Framework, and Spring Boot. •Experience writing unit, functional, and integration tests. •Understanding of software design principles, architectural patterns, and distributed systems. •Ability to apply secure coding practices and participate in code reviews. •Knowledge of data structures and their application to software development. •Experience troubleshooting applications and supporting production issues. •Familiarity with performance testing, monitoring, analysis, or system optimization. •Understanding of observability and operational

The description is cut here. Read the full offer: https://jobsbylevel.com/jobs/software-engineer-ii-at-mastercard-5906ec

Source: https://jobsbylevel.com/jobs/software-engineer-ii-at-mastercard-5906ec

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