Mastercard is a global technology company behind the world’s fastest payments processing network. Mastercard's Commercial Solutions provides capabilities such as expense management, reporting, virtual cards, and acceptance to our issuers, driving visibility and actionable insights. We are seeking a Senior Software Engineer to join our Commercial Platform Engineering organization in our O'Fallon, Missouri location. This is a hybrid position requiring three days on-site per week. As a Senior Software Engineer, you will be responsible for development, deployment support, recruiting & mentoring the team, owning the delivery of user stories, and performing code reviews.