Senior Software Engineer

Mastercard•O'fallon, MO

9d•$115,000 - $184,000•Onsite

About The Position

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. We work to connect and power an inclusive, digital economy that benefits everyone, everywhere, by making transactions safe, simple, smart, and accessible. Using secure data and networks, partnerships, and passion, our innovations and solutions help individuals, financial institutions, governments, and businesses realize their greatest potential. Our decency quotient, or DQ, drives our culture and everything we do inside and outside of our company. We cultivate a culture of inclusion for all employees that respect their individual strengths, views, and experiences. We believe that our differences enable us to be a better team – one that makes better decisions, drives innovation, and delivers better business results. Senior Software Engineers at Mastercard design and code artificial intelligence, cloud, and machine learning platforms that provide mission-critical insights to many of the world’s leading organizations and governments. As a Senior Software Engineer, you will deliver these products and solutions with speed and agility as part of a small team. This will involve developing high-performing, highly scalable software solutions and products for some of the world’s top brands. Specific tasks vary depending on the project and the business unit that you join in.

Requirements

Demonstrated experience developing microservices with JAVA and Spring Boot, required
Proven skills working with relational SQL database, preferably PostgreSQL and Oracle SQL
Advanced understanding of cloud native architecture, PCF, and AWS
Clear proficiency with engineering principles used in building and running mission critical software capabilities (security, scalability, resiliency, customer experience, testing, operability, simplification)
Apply tools (e.g., Sonar, Zally, Checkmarx) and techniques to scan and measure code quality and anti-patterns as part of development activity
Ability to perform domain-driven design to architect and map software solutions to business contexts
Proficient in orchestrating release workflows and pipelines, and apply standardized pipelines via APIs to achieve CI and CD using industry standard tools (e.g., Jenkins, AWS, XL Release, others)
Ability to configure rules and build automation for code with vulnerability scanning and software composition analysis using standard tools (e.g., Sonar, JFrog, XRay, Veracode, others)
Manage builds and artifacts leveraging standard tools (e.g., Artifactory) to ensure error-free deployment of production code using canary and/or blue-green techniques
Ability to work on relational data concepts, preferably with PostgreSQL databases.
Strong analytical and problem-solving skills, with the ability to debug issues and identify practical solutions.
Strong verbal and written communication skills and the ability to work effectively in a collaborative team environment.
Strong hands-on experience in software engineering, including development and quality engineering
Proven experience working with: Testing across platforms: Linux and web applications
Automation development and CI/CD integration and deployment (Jenkins / XLR/ GitHub Actions) and code coverage tools (Sonar, Clover) to ensure high code/ conditional coverage
Unit, functional, and integration testing
Performance testing and engineering
Strong knowledge and understanding of: Software design principles (OOP, modularity, design patterns)
Software architecture concepts (microservices, distributed systems, scalability)
Data structures and algorithms
Experience with secure coding practices and application security principles (e.g., OWASP)
Ability to contribute to system design and architecture decisions; understanding use cases for advanced design patterns (e.g., service-to-worker, MVC, API Gateway, Intercepting Filter, Dependency Injection, Lazy Loading, all from the gang of four) to implement efficient code

Nice To Haves

Experience in cloud and microservices architecture or mainframe modernization
Experience designing systems for reliability, performance, and scalability
Domain knowledge in payments and transaction processing systems
Bachelor’s or master's degree in computer science or equivalent experience is preferred

Responsibilities

Design, build, test, deploy, and maintain software components, automation frameworks, and validation tools
Apply strong knowledge of data structures, algorithms, and efficient coding practices in building scalable solutions
Contribute to end-to-end software development lifecycle, including design, development, testing, deployment, and monitoring
Participate in defining software architecture and design patterns to ensure scalability, reliability, and maintainability
Ensure systems are designed for testability, observability, performance, and operational readiness
Provide input into microservices and cloud migration strategies
Develop and implement test automation frameworks and CI/CD integration pipelines (e.g., Jenkins, XLR)
Design comprehensive test strategies and plans, including performance, reliability, and production simulation testing
Ensure high code quality and coverage using tools such as Sonar or Clover
Apply and promote secure coding practices, including code analysis, vulnerability detection, and mitigation strategies
Integrate security testing into CI/CD pipelines
Conduct and lead code reviews, ensuring adherence to coding standards, security practices, and maintainability
Act as a technical reviewer for system designs, test strategies, and implementation approaches
Ensure systems are observable, monitorable, and resilient across environments
Perform performance engineering, including load testing, tuning, and bottleneck analysis
Troubleshoot complex production issues and ensure rapid resolution
Partner with developers, architects, and product teams to drive engineering best practices
Mentor junior engineers and contribute to knowledge sharing across teams
Evaluate and recommend tools, technologies, and frameworks for continuous improvement

Benefits

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