# Senior Software Engineer at Mastercard

Mastercard is hiring a Senior Software Engineer. Level rates it Little AI ●○○○; you can [apply on Mastercard](https://jobsbylevel.com/go/ac4ecfe7-d18c-49c9-b2ef-51a50b157e31?utm_medium=ai-agent).

AI Level 1, AI centrality 36 out of 100. O'Fallon, Missouri.

## Details

- Company: [Mastercard](https://jobsbylevel.com/companies/mastercard)
- AI level: AI Level 1 (score 36 out of 100)
- Location: O'Fallon, Missouri
- Posted: October 26, 2026
- Apply: https://jobsbylevel.com/go/ac4ecfe7-d18c-49c9-b2ef-51a50b157e31?utm_medium=ai-agent
- Free CV review for this job: https://jobsbylevel.com/cv-review?job=senior-software-engineer-at-mastercard-ac66db

## 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 Senior Software Engineer Overview As a Senior Software Engineer in Mastercard’s Core Payments, Network Solutions team, you will develop software supporting payment and transaction-processing systems. You will combine software development and quality engineering to deliver secure, scalable, reliable applications and services. You will design, build, test, deploy, and maintain software components, automation frameworks, and validation tools. Working with engineers, architects, and product teams, you will contribute to technical decisions, strengthen operational readiness, review code, and mentor junior engineers. What You’ll Do Software Development • Design, build, test, deploy, and maintain software components, automation frameworks, and validation tools for payment-processing applications and services. • Apply data structures, algorithms, and efficient coding practices to deliver scalable solutions. • Contribute across the software development lifecycle, including deployment and monitoring. Design & Architecture • Translate business requirements into maintainable solutions using domain-driven design and established design patterns. • Contribute to architecture and system-design decisions supporting scalability, reliability, testability, observability, and performance. • Provide input into microservices and cloud migration strategies. Quality & Secure Engineering • Develop and maintain unit, functional, and integration tests across applications and services. • Build test automation frameworks and integrate validation into CI/CD pipelines using tools such as Jenkins and XL Release (XLR). • Design test strategies covering payment workflows, service interactions, performance, reliability, and production simulation. • Measure code quality and coverage using tools such as Sonar and Clover. • Apply and promote secure coding practices, vulnerability detection, and mitigation; integrate security testing into delivery pipelines. • Conduct and lead code reviews, and review system designs, test strategies, and implementation approaches. Performance & Operational Excellence • Improve system performance and scalability through load testing, tuning, and bottleneck analysis. • Build observability, monitoring, resilience, and operational readiness into solutions across environments. • Troubleshoot complex production issues, identify root causes, and support timely resolution. Collaboration & Technical Leadership • Partner with engineering, architecture, and product teams to deliver solutions and strengthen engineering practices. • Mentor junior engineers and share technical knowledge across teams. • Evaluate and recommend tools, technologies, and frameworks for continuous improvement. Required Qualifications • Strong practical experience in software engineering, including development and quality engineering. • Demonstrated proficiency developing microservices with Java and Spring Boot. • Proficiency with relational databases and SQL. • Advanced understanding of cloud-native architecture, PCF, and AWS. • Experience deploying and managing containerized applications using Kubernetes. • Understanding of event-driven design and its application to distributed systems. • Ability to use Splunk for log analysis, monitoring, and troubleshooting. • Strong understanding of object-oriented programming, modularity, design patterns, distributed systems, data structures, and algorithms. • Ability to apply domain-driven design and contribute

The description is cut here. Read the full offer: https://jobsbylevel.com/jobs/senior-software-engineer-at-mastercard-ac66db

Source: https://jobsbylevel.com/jobs/senior-software-engineer-at-mastercard-ac66db

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