Software Engineer II

Mastercard•O'fallon, MO

1d•$92,000 - $147,000•Hybrid

About The Position

Mastercard’s Global Credit Authorization team is seeking a Software Engineer II (C/C++) who is passionate about building high-performance, mission-critical systems that operate at global scale. In this role, you will collaborate with talented engineers to design, develop, test, and support innovative solutions that drive Mastercard’s authorization platform. You'll work in a fast-paced, Agile environment where quality, reliability, and continuous improvement are fundamental to our success. This is a hybrid position based in O'Fallon, MO, with an expectation of three days per week onsite.

Requirements

Strong programming experience with C/C++.
Experience with scripting languages, preferably Shell scripting.
Experience writing automated unit tests using frameworks such as Google Test or JUnit.
Experience developing applications on Linux operating systems.
Experience using source control systems such as Git or Bitbucket in a collaborative development environment.
Strong understanding of algorithms, data structures, and distributed systems concepts.
Experience working within Agile methodologies such as Scrum or Kanban, including continuous integration and iterative software delivery.
Strong analytical and problem-solving skills with a passion for building reliable, high-performance software.
Self-motivated, proactive, and able to manage competing priorities in a collaborative, fast-paced environment.
Excellent verbal and written communication skills with the ability to communicate technical concepts to both technical and non-technical audiences.
Bachelor's degree in Computer Science, Software Engineering, Information Technology, Mathematics, or a related field. Equivalent practical experience will also be considered.
Must be eligible to work in the United States, now as well as in the future, without employer sponsorship.

Responsibilities

Design, develop, and maintain high-quality, scalable C/C++ software that meets Mastercard’s engineering and security standards.
Deliver user stories within Agile sprint timelines while maintaining a strong focus on quality and reliability.
Create comprehensive unit tests and automated test coverage to validate functional and non-functional requirements.
Partner closely with quality engineers to support functional, integration, and system testing efforts.
Participate in code reviews and technical design discussions to promote maintainable, efficient, and secure solutions.
Contribute detailed technical designs and implementation plans for assigned work.
Actively engage in requirements analysis, backlog refinement, and sprint planning activities.
Collaborate with engineers, architects, product owners, and other stakeholders to achieve project goals and address technical challenges.
Take ownership of assigned features and support production systems through incident response and on-call participation.
Develop and maintain technical documentation that supports operational excellence and long-term maintainability.
Support continuous improvement initiatives, engineering best practices, and automation efforts across the team.
Contribute to a collaborative and inclusive team culture focused on learning, innovation, and operational excellence.

Benefits

insurance (including medical, prescription drug, dental, vision, disability, life insurance)
flexible spending account and health savings account
16 weeks of new parent leave
up to 20 days of bereavement leave
80 hours of Paid Sick and Safe Time
25 days of vacation time
5 personal days
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