Senior Software Engineer

Mastercard; O’Fallon (MO); On-site; USD 115,000 - 184,000; Full time

Job summary

Mastercard seeks a Senior Software Engineer to drive automation, API validation, and scalable platform delivery. You will design reusable frameworks, validate REST API behavior, and enhance performance and reliability across billing and pricing platforms built on Java and Spring technologies.

Join a collaborative, inclusive environment and mentor peers while delivering high-quality, secure software in a complex, distributed system landscape.

Qualifications

• 6+ years of experience in software engineering or related field.
• Strong proficiency in Java and OOP.
• Experience with Spring and Spring Boot.
• Experience building automated validation across web, API, integration, and end-to-end workflows with Selenium/Cypress or equivalent.
• Experience maintaining reusable automation for APIs, UIs, or distributed systems.
• Understanding of REST APIs, microservices, API contracts, and data validation.
• Experience integrating automated controls into CI/CD pipelines.

Responsibilities

• Design, develop, and maintain reusable automation frameworks with Java.
• Build solutions that validate API, UI, integration, and end-to-end workflows.
• Develop libraries, data generators, and service virtualization to improve efficiency.
• Apply solid design principles to create scalable and maintainable solutions.
• Evaluate tools like REST Assured, Selenium, Cypress, Cucumber, Insomnia, and SQL Developer.

Skills

Java

Spring/Spring Boot

REST APIs

CI/CD

Automation frameworks

Selenium

Cypress

REST Assured

Observability

Problem solving

Tools

JUnit

Maven

JMeter

BlazeMeter

Job 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

At Mastercard, our technology and innovation are driven by a clear purpose: to build a sustainable, inclusive global economy. Our commitment to being a force for good is embedded in The Mastercard Way—the principles and behaviors that define who we are and how we deliver value to our customers, partners, and communities. We foster a highly collaborative and inclusive environment where employees are empowered to bring their full, authentic selves to work. By leveraging the diverse strengths, perspectives, and experiences of our global workforce, we continue to drive innovation at scale. Role Summary The Pricing & Billing Resource Center (PBRC) team develops and operates business-critical, API-driven platforms built on Java and Spring technologies. These platforms deliver highly scalable, secure, and reliable billing and pricing capabilities across Mastercard.

Key Responsibilities

Engineering Automation and Framework Development

• Design, develop, and maintain reusable automation frameworks using Java and modern engineering practices.
• Build software solutions that validate application behavior across API, UI, integration, and end-to-end workflows.
• Develop reusable libraries, utilities, data generators, and service virtualization capabilities that improve engineering efficiency.
• Apply object-oriented design principles, data structures, and software design patterns to create scalable and maintainable solutions.
• Evaluate and incorporate tools such as REST Assured, Selenium, Cypress, Cucumber, Insomnia and SQL Developer where appropriate.

API and Application Integrity

• Develop automated solutions that verify REST API behavior, service interactions, data integrity, and user workflows.
• Assess API contracts, schemas, business rules, error handling, boundary conditions, and failure scenarios.
• Collaborate with application engineers to improve component-level, functional, integration, and end-to-end coverage.
• Analyze complex distributed-system interactions and develop controls that detect regressions earlier in the delivery lifecycle.
• Translate technical requirements and business scenarios into repeatable, measurable engineering outcomes.

Performance and Reliability Engineering

• Design and execute automated performance, load, stress, scalability, and resiliency assessments.
• Establish and maintain engineering baselines for throughput, latency, resource utilization, and service reliability.
• Use tools such as JMeter and BlazeMeter to identify system constraints and validate capacity expectations.
• Partner with engineering teams to diagnose bottlenecks, troubleshoot complex issues, and implement sustainable improvements.
• Contribute to application observability, operational readiness, production stability, and service-level objectives.

Software Delivery and Operational Excellence

• Integrate automated engineering controls into CI/CD pipelines to provide rapid feedback and support release decisions.
• Develop efficient execution strategies, including parallel processing and environment-independent solutions.
• Establish measurable quality gates that assess functional behavior, integration integrity, security, and performance.
• Support root-cause analysis by providing clear diagnostics, reproducible evidence, and actionable technical findings.
• Identify recurring failure patterns and develop automated mechanisms that prevent or detect recurrence.

Engineering Standards and Technical Leadership

• Contribute to software design and architecture decisions with a focus on scalability, maintainability, security, performance, and reliability.
• Participate in code reviews to promote secure coding practices, engineering standards, and maintainable solutions.
• Assess technical and delivery risks and recommend appropriate engineering controls.
• Lead improvements to automation frameworks, development practices, and delivery processes.
• Mentor engineers and promote shared ownership of product integrity throughout the software development lifecycle.
• Partner across teams to continuously improve platform capabilities and customer outcomes.

Required Qualifications

• 6+ years of experience in software engineering, application development, engineering automation, or a related technical field.
• Strong proficiency in Java, object-oriented programming, and software design principles.
• Experience developing applications, frameworks, or engineering tools using Spring and Spring Boot.
• Experience building automated validation capabilities across web, API, integration, and end-to-end workflows using Selenium, Cypress, or equivalent frameworks.
• Experience building and maintaining reusable automation solutions for APIs, user interfaces, service integrations, or distributed systems.
• Strong understanding of REST APIs, microservices architectures, API contracts, and data validation.
• Experience with unit, functional, integration, end-to-end, and performance validation techniques.
• Experience integrating automated controls into CI/CD pipelines and modern software delivery workflows.
• Understanding of software architecture, data structures, algorithms, and application design patterns.
• Knowledge of secure coding practices, application security principles, and code review techniques.
• Strong troubleshooting, debugging, analytical, and problem-solving capabilities.
• Ability to work independently in complex situations and provide technical guidance to other engineers.
• Experience collaborating within Agile software development teams.

Preferred Qualifications

• Experience designing or evolving automation frameworks beyond individual script or scenario development.
• Hands-on experience with REST Assured, Selenium, Cypress, Cucumber, Insomnia or SQL Developer.
• Experience with performance engineering tools such as JMeter or BlazeMeter.
• Familiarity with framework design patterns, abstraction layers, reusable components, and executable specifications.
• Experience supporting high-volume, mission-critical platforms with strict availability and performance expectations.
• Experience with containerized, cloud-based, or shared engineering environments.
• Experience developing solutions for data pipelines, ETL processes, event-driven architectures, or streaming platforms. Exposure to technologies such as Kafka, Spark, NiFi, Ozone, Ceph, or similar distributed data processing and storage platforms is preferred.
• Familiarity with observability, service virtualization, synthetic data generation, and environment management.
• Domain experience in billing, financial services, payments, pricing, or card-processing systems

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, and
• Complete all periodic mandatory security trainings in accordance with Mastercard’s guidelines.

Mastercard is a merit-based, inclusive, equal opportunity employer that considers applicants without regard to gender, gender identity, sexual orientation, race, ethnicity, disabled or veteran status, or any other characteristic protected by law. We hire the most qualified candidate for the role. In the US or Canada, if you require accommodations or assistance to complete the online application process or during the recruitment process, please contact [e-mail] and identify the type of accommodation or assistance you are requesting. Do not include any medical or health information in this email. The Reasonable Accommodations team will respond to your email promptly.

In line with Mastercard’s total compensation philosophy and assuming that the job will be performed in the US, the successful candidate will be offered a competitive base salary and may be eligible for an annual bonus or commissions depending on the role. The base salary offered may vary depending on multiple factors, including but not limited to location, job-related knowledge, skills, and experience. Mastercard benefits for full time (and certain part time) employees generally include: 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; and many more. Mastercard benefits for interns generally include: 56 hours of Paid Sick and Safe Time; jury duty leave; and on-site fitness facilities in some locations.

Pay Ranges

O'Fallon, Missouri: $115,000 - $184,000 USD