Software Engineer I

Mastercard•O'fallon, MO

3d•$72,000 - $115,000•Onsite

About The Position

As a Software Engineer, you'll work alongside experienced engineers to design, develop, test, deploy, and support software solutions while building a strong foundation in modern software engineering practices. This is a great opportunity for early-career engineers who are passionate about technology, eager to learn, and excited to contribute to scalable, secure, and high-quality software. You'll gain hands-on experience across the software development lifecycle while collaborating with cross-functional teams to solve real-world business challenges.

Requirements

Foundational understanding of software development principles, methodologies, and best practices
Understanding of software design concepts and how applications are structured and built
Exposure to software architecture principles, patterns, and system interactions
Knowledge of data structures and their use in solving technical problems efficiently
Familiarity with object-oriented programming and modern programming languages such as Java, Python, C#, or similar
Understanding of unit, functional, and integration testing concepts
Knowledge of code review practices and software quality standards
Familiarity with secure coding practices and application security fundamentals
Understanding of application performance, scalability, and reliability concepts
Ability to troubleshoot and analyze software and system issues using structured problem-solving approaches
Bachelor's degree in Computer Science, Information Technology, Management Information Systems, or equivalent practical experience
0–12 months of software engineering experience through internships, academic projects, co-ops, bootcamps, or professional experience

Nice To Haves

Exposure to monitoring, support, or operational readiness concepts is a plus
Strong analytical, organizational, and communication skills
High-energy, detail-oriented, and self-motivated with a desire to learn and grow
Ability to work collaboratively in a diverse, team-oriented environment
Comfortable receiving guidance while developing technical expertise

Responsibilities

Design, develop, test, deploy, and maintain software applications and services
Contribute to software design and architecture discussions to build scalable, maintainable, and secure solutions
Develop high-quality code that meets technical, performance, and reliability requirements
Create and execute unit, functional, and integration tests to ensure software quality and stability
Participate in code reviews and apply engineering best practices to improve code quality and maintainability
Research and evaluate technical solutions to address changing business and customer needs
Apply secure coding practices throughout the software development lifecycle
Support performance engineering activities to improve application responsiveness and scalability
Troubleshoot and resolve application and system issues with guidance from senior team members
Contribute to system operability, monitoring, reliability, and support readiness
Create and maintain technical, testing, and system documentation
Follow Mastercard development, quality assurance, and audit compliance standards
Support software metrics collection, reporting, and continuous improvement initiatives
Collaborate effectively within diverse, matrixed, and geographically distributed teams
Leverage AI-assisted development tools responsibly while validating outputs for quality, security, and accuracy
Continuously learn new technologies, frameworks, and engineering practices

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
56 hours of Paid Sick and Safe Time (for interns)
jury duty leave (for interns)
on-site fitness facilities in some locations (for interns)