Software Engineer II – Hybrid (O’Fallon, MO)

About the role

Mastercard’s ACI team within the Payment Enablement program is looking for a Software Engineer II to design, develop, test and maintain scalable, secure software solutions. The role is hybrid, based in O’Fallon, MO, and involves full‑lifecycle development from analysis through production support.

Key responsibilities

• Design, develop, test, implement and maintain software applications following Mastercard engineering standards.
• Deliver secure, reliable and scalable solutions on schedule and within budget.
• Research and evaluate alternative technical approaches to meet current and future business needs.
• Conduct feasibility studies, system flowcharting and logic design.
• Collaborate with cross‑functional team members and stakeholders to identify issues early and propose practical solutions.
• Independently manage assigned tasks and participate in production support, incident management and on‑call rotations.
• Create and maintain comprehensive technical documentation in line with quality and governance standards.

Required profile

• Experience contributing to full software development lifecycle in an Agile environment.
• Ability to work independently and as part of a small, flexible team.
• Strong problem‑solving skills and attention to detail.

Required skills

• Agile software development methodology.
• Continuous integration and continuous delivery (CI/CD) practices.