Mastercard Jobs

Job Information

MasterCard Senior Software Engineer (Network as a Service) in O'Fallon, Missouri

Our Purpose

We work 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. Our decency quotient, or DQ, drives our culture and everything we do inside and outside of our company. We cultivate a culture of inclusion ( for all employees that respects their individual strengths, views, and experiences. We believe that our differences enable us to be a better team – one that makes better decisions, drives innovation and delivers better business results.

Job Title

Senior Software Engineer (Network as a Service)


As a member of the Software Defined Networking team, you will own and deliver the code to bring our network to the next level. As a "militantly automated" team, we work in Source Control and let pipelines drive our work. We believe in configuration modeling and defining standards via automation so the tooling can do the heavy lifting for us. You will participate on a high performing team that designs, builds, and runs a new software product that manages network policy and load balancer configuration across all Mastercard data centers.


  • Build and test software to manage network infrastructure and configuration

  • Create and participate in peer code reviews through pull requests

  • Ongoing evaluation and improvement of our software modules

  • Support what we build – either by machine or by hand

  • Work with partners and external vendors to ensure all needs are addressed

  • Work across internal IT teams to resolve complex issues

  • File and follow up on bugs and feature enhancements needed for industrialization of our offerings

  • Document every solution to build an internal Knowledge Base, usable globally

All About You

  • Has a degree or similar in IT / Computer Science

  • Is familiar with driving complex software projects from design and development to ongoing management

  • Can write high quality, secure and clean code following SOLID design principles in multiple programming languages (e.g., Go, Python, C#, Java, JavaScript)

  • Experienced with modern approaches to automated software testing

  • Understanding of CI/CD topics and development methodologies including pipelines, pull requests, git, command line, etc

  • Experience with infrastructure provisioning and configuration management tooling such as Terraform, Chef or Ansible

  • Is comfortable with networking concepts/architecture and has familiarity in routing, switching, NAT and network services such as load balancers

  • Displays willingness and aptitude to learn

  • Has a proven ability to work under pressure and meet deadlines

  • Ability to produce quality technical documentation

  • Has good communication skills and is eager to work on an awesome team

COVID-19 Considerations

We value the safety of each member of our community because we know we’re all in this together. In many locations, which may change over time, we’ve implemented a virtual hiring process and continue to interview candidates by video or phone. In addition, in some locations, only individuals who have been fully vaccinated will be permitted inside Mastercard offices until further notice.

In the US, Mastercard is a government contractor, which may legally require most Mastercard employees to be vaccinated unless a verified approved medical or religious exemption is granted. Further, we are currently making every effort towards having employees return to work in the office 2 days per week, if that makes sense for their team. Everyone must be vaccinated to enter Mastercard offices at this time. Therefore, we expect all candidates to be vaccinated or to be approved for a medical or religious accommodation prior to commencing work at Mastercard.

In the US, Mastercard is an inclusive Equal Employment Opportunity employer that considers applicants without regard to gender, gender identity, sexual orientation, race, ethnicity, disabled or veteran status, or any other characteristic protected by law. If you require accommodations or assistance to complete the online application process, please contact and identify the type of accommodation or assistance you are requesting. Do not include any medical or health information in this email. The Reasonable Accommodations team will respond to your email promptly.

Corporate Security Responsibility

All activities involving access to Mastercard assets, information, and networks comes with an inherent risk to the organization and, therefore, it is expected that every person working for, or on behalf of, Mastercard is responsible for information security and must:

  • 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.

Requisition ID: R-157878