# Software Engineer II at Mastercard

Mastercard is hiring a Software Engineer II. Level rates it Little AI ●○○○; you can [apply on Mastercard](https://jobsbylevel.com/go/2856a69e-c1d8-41bc-ae6e-7e779b7d0e3e?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/2856a69e-c1d8-41bc-ae6e-7e779b7d0e3e?utm_medium=ai-agent
- Free CV review for this job: https://jobsbylevel.com/cv-review?job=software-engineer-ii-at-mastercard-bc72fe

## 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 Join Mastercard’s Core Payments, Network Solutions team to develop software that supports secure, reliable, and scalable payment-processing capabilities. This role combines software development, quality engineering, and operational readiness to help deliver dependable solutions across the payments ecosystem. As a Software Engineer II, you will design, build, test, deploy, and maintain software components, automation frameworks, and validation tools supporting payment applications and services. You will apply strong engineering fundamentals to system interactions, transaction-processing workflows, performance, and resilience. You will independently execute routine and moderately complex assignments, with occasional guidance on unfamiliar or highly complex work. What You'll Do Software Development •Design, build, test, deploy, and maintain software components, automation frameworks, and validation tools supporting Core Payments, Network Solutions applications and services. •Develop microservices using Java and Spring Boot and work with relational SQL databases. •Apply data structures, algorithms, and efficient coding practices to build scalable solutions. •Contribute across the software development lifecycle, including deployment, monitoring, and ongoing maintenance. Design & Architecture •Participate in software design and architecture discussions, applying established patterns to support scalability, reliability, and maintainability. •Apply domain-driven design principles to translate payment-processing requirements and service interactions into maintainable software solutions. •Design components for testability, observability, performance, and operational readiness. •Contribute to microservices and cloud migration approaches. Quality & Secure Engineering •Develop and maintain unit, functional, and integration tests, automation frameworks, and CI/CD testing integrations. •Contribute to test strategies and plans covering transaction-processing workflows, service integrations, performance, reliability, and production simulation. •Use code analysis and coverage tools to identify quality issues, anti-patterns, and testing gaps. •Apply secure coding standards and integrate security testing, vulnerability scanning, and software composition analysis into delivery pipelines. •Participate in peer code reviews and technical reviews of designs, test strategies, and implementation approaches. Performance & Operational Excellence •Analyze and improve transaction-processing performance, response times, and scalability through load testing, tuning, and bottleneck analysis. •Support observability, monitoring, resilience, and operational readiness across environments. •Diagnose production issues, identify root causes, and implement practical solutions, seeking guidance on unfamiliar or highly complex scenarios. •Manage release workflows, builds, and artifacts through standardized CI/CD pipelines, including canary or blue-green deployment techniques. Collaboration •Partner with engineering, architecture, product, and operational stakeholders to deliver payment solutions and strengthen engineering practices. •Share knowledge and support colleagues through collaborative problem-solving and peer feedback. •Evaluate tools, technologies, and frameworks and recommend opportunities for continuous improvement. •Communicate clearly and work effectively within a collaborative team environment. Required

The description is cut here. Read the full offer: https://jobsbylevel.com/jobs/software-engineer-ii-at-mastercard-bc72fe

Source: https://jobsbylevel.com/jobs/software-engineer-ii-at-mastercard-bc72fe

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Level. https://jobsbylevel.com/jobs/software-engineer-ii-at-mastercard-bc72fe.

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