Software Engineer II

Mastercard•O’Fallon, MO

About The Position

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
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.

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

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
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.