Software Engineer II

Mastercard • O'fallon, MO

9d • $92,000 - $147,000

About The Position

Software Engineer II

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 Who is Mastercard Mastercard is a global technology company in the payments industry. We work to connect and power an inclusive, digital economy that benefits everyone, everywhere by making transactions safe, simple, smart and accessible. Our mission is 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. Overview The Software Engineer II is a mid‑level individual contributor role within Mastercard’s Technology organization. This position contributes to the Cryptographic Security program, with a focus on building and evolving secure, scalable cryptographic services and the DCaaS (Distributed Crypto as a Service) product. The role supports encryption, key management, and data protection capabilities that are foundational to Mastercard’s digital payment platforms.

Requirements

• Bachelor’s degree in Computer Science, Engineering, Information Technology, or equivalent experience
• Demonstrated professional experience in software engineering or application development
• Proficiency in one or more programming languages and experience delivering production‑quality code (Go/Rust preferred)
• Solid understanding of software design principles, data structures, and development methodologies
• Experience working in Agile or iterative development environments
• Strong analytical, problem‑solving, and communication skills
• Ability to work independently on assigned tasks while collaborating effectively within a team
• Familiarity with secure coding practices, testing frameworks, and version control systems

Responsibilities

• Operating with increased independence, the Software Engineer II works within Agile delivery teams to design, develop, test, and maintain high‑availability, security‑critical services.
• The role partners with product, security, and platform stakeholders to deliver resilient solutions that meet regulatory, performance, and enterprise‑grade security requirements.
• Design, develop, test, and maintain software applications in accordance with Mastercard engineering, security, and quality standards
• Own software delivery tasks at the application or component level, including development, testing, and deployment
• Troubleshoot, refactor, and enhance existing code to improve performance, reliability, and maintainability
• Participate in technical design discussions, code reviews, and solution evaluations
• Collaborate with cross‑functional partners to deliver solutions aligned to business requirements
• Contribute to technical documentation and knowledge sharing
• Support production incidents and operational activities as required
• Assist in mentoring and supporting less experienced engineers
• Identify and contribute to continuous improvement of engineering processes and practices
• 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.

Benefits

• 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.

What This Job Offers

• Job Type: Full-time
• Career Level: Mid Level